Cooling Fan running

Hi riverrev, I have the cooling fan schematic here for you and from here we can start with rectification. First step would to check for power supply. when Ac is turned on, is the compressor engaging? If the compressor does not engage, the fans would not work. To test the fan circuit, unplug the fan switch located on the thermosat housing and use a jumper to bridge. If fan works when ignition switch is turned to ON, the circuit is ok.

KHLOW2008

thanks for the quick reply. well the compressor does not engage. i also jumped the plug at the thermostat and the fans did not come on.

There are two sensors on my engine the rear on by the thermostat is the cooling fan temp sensor but there is on also on the front of the engine on the return for the water what is this called

Before performing tests, check fuses No. 4 and 8 in dash fuse box and fuses No. 15, 18, 21 and 34 in underhood fuse/relay box.

The next step is to check if the fans are in working order.

Unplug the cooling fan connectors. Apply power to the fan connectors to test if the fans are working.

fuses are all good. started to rain, couldn't test the fans, however, they are brand new.

One of my 1995 4 cyl Accords has 135k miles. The other around 178k. The other night I came home very late and the one that hadn't been driven in 2 days had the radiator fan running full speed. I had to remove the fuse to kill it. The next day I reinserted the fuse and it started up again. I removed the relay that controls it and it stopped. Swapped relays and it still ran. Unplugged both engine temp sensors on the engine one at a time and the fan still ran. I see in the wiring diagram a device called a radiator fan timer module that is supposedly under the dash that I would love to swap between cars. I even found a picture of one online and the Honda part number but I can't find it in either of my cars. Any one have a physical location of it for me?

Behind the glove box

With ignition switch OFF. Remove AC fan relay. Test the white wire for battery voltage. If voltage is available, use jumper to bridge it with the terminal next to it. Condenser fan should work. Repeat process with radiator fan relay. ( Note the position of the terminals, similar to AC fan relay) If both fans work, next to check would be the radiator fan control module, located behind the glovebox.

checked both fans. wires hot to relay, jumped and fans came on. I have located fan module, how do I check it?

Here are the testing procedures for all the cooling system components. Refer to previous post for the diagrams.

My 1995 Accord LX (4cyl) engine fan will stay on or come on 5 to 15 seconds after I turn engine off. It will shut off after about 30 or 60 seconds depending on how warm it is. Is this normal for that model and year?
Thanks.

Yes it is. When coolant temperature is higher than expected at upper radiator hose joint to engine, it would turn the fan switch on which would start the fan. Ensure coolant level in radiator is correct and check while engine is cold.

Hi, I just bought a used 1994 honda accord. When I noticed I was leaking I tried stop leak. Two days later it began to leak again and over heat as well. I bought a new raidator and cooling fan, because the old one was woobling. Once the new parts where placed in I began to fill it with water, car off and drainage spout open just fine, no signs of any leakage. While still filling I closed the spout and had my wife turn the car on. As began to fill it with raidator fueled I noticed it was leaking again. Only this time it didnt over heat like before. I let it continue to run for five minutes in hope it would possibly stop once it got a full cerulation,but it leek worse than the old one where I think the leek was coming from was at the bottom of the raidator Cromwell screws that goes into the fan and from a hoses but that hoses was not peeking before did I mess something up when I put it in or what plz help me

can you post a picture??


Roy

A pic of it leaking yeah give me about 20 min

first picture tells it all for me. looks like the new rad is leaking. call the parts store and make sure they have another.

roy

I just moved from michigan to california and drove this car the whole way. It broke down 5 times due to issues with the radiator and transmision. I have put a great deal of money into this car coming out here and there is still more to be fixed. I'm trying to save some money by doing some repairs myself.

problem number one is the car's speedometer stoped working all of a sudden. It happened right when the engine started to overheat for the first time. i dont know if there is a connection there or not. anyways, it did not completely stop working. it would come on every once in a while for a second or two and then quit again. from illanois to california the tripometer only said i went 56 miles. that is just how much of the 2,500 mile trip the speedometer worked. I was just wondering what is wrong with it and how i might fix it.

continuing on to problem 2 is the radiator fan. First off, in texas, we had a new radiator put in and then in texas again and arizona we had new hoses put in for the radiator. they never did anything with the radiator fan though. i kept wondering why the car was still overheating with a brand new radiator and hoses with no leaks. but then i noticed that the fan for the ac unit was working, however the motor for the radiator fan had stoped working. so just yesterday I bought a new motor and put it in. I connected the wires back up but the fan never seemed to come on even after letting it sit for a alf hour and driving it for a half hour. it did not overheat, but then again it does not always overheat. It usually only overheats on a day where the temp outside is above 80 and it has been driven for an hour or so in stop and go traffic. once it is moving there is enough air flow and it is fine, but when it is stopped it will sometimes overheat. but i still would have thought that the fan would have come on at some point withing that hour of running. so is there something other than the motor that could be wrong? also, i don't know if this is related to this problem or something else but during every trip i take, the check engine light comes on within the first 10-15 minutes of driving but most of the time when im on the expressway, yet sometimes in the city as well.

continuing on to problem 3, is seems to be maybe a transmission issue? Last night when i changed the fan and was checing to see if it was working, I had my friend start the car and rev the engine holding it at 2500 rpms. While he was doing that, even with consistant pressure on the accelorator, the rpms would jump down 500 rpms and build up to 2500 again. at stop lights, sometimes it does the same thing it usually idles around 1000 and at one point it did this so bad that when it jumped down, it stalled the car. then it seemed to fix itself and was working fine for a while but now its back but not as bad...yet. also it does this while driving. especially in acceleration. it just seems that it needs more gas to accelerate and then all of a sudden it jumps up again, changes gears and then jusmps down again make a rather rough shift. It does not do this all the time but it does it a few times every trip into town i go on. I bought some sea foam stuff to see if i could run it through and see if that fixes the problem but i have not tried it yet. however that is what one of the guys at one of the several car repair shops i went to used and it worked great then, but it hasn't been driven too much since they did it last so i don't know If that would be the problem. I had the transmission fluid replaced however with the car still overheating from time to time, would that burn up the transmission fluid again and possible cause this problem? the problem with the transmission before was that the wire that ran from the computer to tell the car when to shift was resting on the axle somehow and the axle eventually burned through it causing the car to remain in first unless i manually put it in second with the gear shifter.

lastly is problem number 4. this has been an issue for a long time. to me it doesn't seem huge, but it is really annoying. The suspension squeks real bad. in michigan I had a shop put some grease in the bushings i believe it was, and it helped out a lot however it just keeps coming back. Is this an indication that the suspenision could be bad though. the guys at the shop that did this did not seem to think so. but what can i do to get rid of the squeeking?

Thank you so much for your time and I look forward to possibly getting something figured out on this car for once.

Hello, can you let me know which engine it has.....is the L4-2.2L SOHC VTEC or teh L4-2156cc 2.2L SOHC MFI

Thanks

it is the vtec

Hello Looks like the car is doing great for you even though you say you have put a great deal of money into it since it has about 160000 miles. It is time certain things start to go though. Number One: My first thought is the Vehicle Speed Sensor. I have attached a few troubleshooting charts for you and some pics and directions on how to change.

1. Disconnect the 3-P connector from the vehicle speed sensor (VSS). 2. Remove the mounting bolts, then remove the VSS. NOTE: The VSS drive link is a very small part, be careful not to lose it. 3. Install in the reverse order of removal. Number Two First Part (You tried to sneak another problem in there with the check engine light, just kidding of course) - Just to keep in the back of your mind - there is a Technical Service Bulleting out on Temp Gauge Goes to Hot: Bulletin NBR 94-021. I am not saying that is the problem here, I just want you aware to keep in the back of your mind for future info. - You stated you change radiator and new hoses. You have never said anything about the thermostat. Though that still isn't dealing with your fans, with that many miles and the cost of a thermostat, that baby would be changed. - Now the fans. I have attached some info below on the operation of the cooling system for your reading pleasure. - Cooling fan operation is controlled by the fan timer module, which monitors signals from a thermo sensor, underhood temperature sensor and the A/C compressor clutch. The timer operates the cooling fan by controlling voltage applied to the fan relay control coil. Battery voltage is applied directly from the main fuse to the relay switch circuit and timer bypass circuit, and voltage is applied to the timer main circuits through the ignition switch start and run contacts. The timer module controls voltage applied to the relay control coil circuit, and the control coil circuit is completed to ground either through the thermo sensor or timing module. When current flows through the relay coil circuit, the relay contacts close and voltage is applied to the cooling fan motor. During normal operation, voltage is applied to the relay coil by the timer module and fan operation is controlled by the thermo sensor. When coolant temperature is approximately 190 °F, current flows through the relay coil circuit and voltage is applied to the fan motor. When coolant temperature is below 190 °F, the thermo sensor contacts are open and the cooling fan does not operate. However, when the A/C is turned on, the timer energizes the relay coil and the cooling fan operates as long as the clutch remains energized. When the engine is turned off, the timer module remains energized and monitors signals from the underhood temperature sensor. If underhood temperature exceeds 220 °F, the timer activates the fan relay and the cooling fan is energized. The cooling fan will operate for a maximum of 15 minutes after the engine has stopped or until underhood temperature drops below 220 °F. - Now the fans continued: Please check all fuses with a volt meter for continuity. Not always is visual okay. Fuses 4, 8, 15, 18, 21, 34. I have attached pics of the fuse panels etc.

- Question, my information shows 1 fan. Is that all you have? - Next - when you turn the AC on, the fan should automatically come on. If the fuses are okay, and you changed the fan motor, then I would check the radiator fan relay and the condenser fan relay. Tests below. - Before we go farther than this, most of the time it is the fuses or relays or motor. So let me know from here on this. RADIATOR FAN RELAY

RADIATOR FAN RELAY TEST There should be continuity between the A and C terminals when power and ground are connected to the B and D terminals, and there should be no continuity when power is disconnected. CONDENSER FAN RELAY

CONDENSER FAN RELAY TEST There should be continuity between the A and C terminals when power and ground are connected to the B and D terminals, and there should be no continuity when power is disconnected. Number Two Second Part: Now for the check engine light. Go to Auto Zone or O'Reilly's and for free they will pull the codes on the car. Find out what they are. Hey, while you are there, for free, have them bring the tester out and check your battery, alternator and starter. Number Three: For the transmission problem, if a wire was burnt through, then I would check that wire really well. Look up and down it. If it feels harder than other areas or looks burnt, it may be damaged inside. I would splice a new piece in. Check that and we can go back to that. Number Four: There are many parts to the suspension. Please be more specific. Front, rear, left side, right side. Provide the names of the parts you are talking about. Remember - one thing at a time. If you replace too much at one time you won't know what fixed what. Eat this elephant one bite at a time. When you are looking at a problem...try to stick to just that one thing....skipping around can cause confusion. Okay, try these things and let us know. Bob

I hit a tree recently and replaced my passenger side coolant fan along with the radiator and other needed parts. While taking out a headlight, the old fan motor turned on until I detached the battery. Now, with the new fan, it turns on and stays on when I turn off the ignition. I can get it to turn off if I detach the battery and then immediately put it back on. It is not over-heating and it never turned on like that before. Let me know what you think.
I also had the relays checked along with the fuses and they are all working properly.
Thanks,
Craig in Portland

Start by checking these items.

I have a 1995 Honda Accord EX 4 cylinder with 140,000 miles. Occasionally once I turn the car off it sounds like it continues to run. Not sure if this is related to the cooling fan or what? It can run from 5 to 15 minutes. I believe it tends to happen after I drive longer distances and it happens more often after I have the A/C on. The car never runs hot and has not had any problems starting. Where should I start?

I would check the timing of the engine to deal with the run on after the key is turned off.

Check the coolant level, add as necessary, and then purge the air from the system using the bleeder. The fan running is okay, but watch it closely. You may have a sensor failing that is indicating the temp to the fan.

I have a 1994 Honda Accord 2.4L Automatic Transmission. When you turn the car off, the cooling fan does not turn off at all. I used to be able to pull the fuse for it, but now it stays on. I had the fan relay under the hood replaced last summer. The mechanic says it could possibly be the ECM going bad. I am stuck with this one, because it can kill the battery. Please send response.

[quote:c17bd2f240="rbrazell1"]I have a 1994 Honda Accord 2.4L Automatic Transmission. When you turn the car off, the cooling fan does not turn off at all. I used to be able to pull the fuse for it, but now it stays on. I had the fan relay under the hood replaced last summer. The mechanic says it could possibly be the ECM going bad. I am stuck with this one, because it can kill the battery. Please send response.[/quote:c17bd2f240]

Could be the coolant temperature sensor/temperature switch/relay and last the PCM

Car is over heating. Has new water pump. Has new cooling fan. Strange thing the car will over heat and when you turn off the car the electric fan comes on.

I dont know if the car has a termistat or not. Where is it located?? What can cause the fan to act strange like that.

does fan turn on when the car is running?

I dont know if the car has a termistat or not. Where is it located?? What can cause the fan to act strange like that.

The fan relay could be sticking. The thermostat location follow the upper hose till it meets up with a housing where the hose is clamped to-its behind the housing. If its not there do the same for the lower hose.

I just replaced the cooling fan on the driver's side of the radiator as the original one stopped working. Now the fan runs without the vehicle being warm, meaning after running the engine for a few minutes the fans starts running and continues to run after the car is off and not anywhere near operating temperature. Is the problem with the radiator fan control module/fan time relay module brain?

Hi, thanks for the donation, found this info in our database. Are there any applicable trouble codes for the fan? As you can see from the fan relay wiring, the voltage for the load/switch side of relay is hot all the time. Voltage to the coil side of relay, goes hot when the key is on, yellow wire. The relay is energized by the ground circuit , solid blue wire/s, several switches have control over the ground circuit, right now, I'm not sure which one is causing the problem?

my cooling fans stay on and are very loud when the car is off,is this normal.They only stay on for a short time.

Yes, this is normal. Many honda models had this feature to cool the engine after it was shut off. Your highest temp. is on engine shut off. The coolant builds pressure also. The cooling also helps relive this pressure.

Cooling fan will come on and stay on now and then after ignition has been turned off. Fan will continue to run until battery has completely gone dead. I have stopped the fan by removing the relay.

Hi mike osborn,

Try swapping the relay, it could be faulty and sticking. The fan would come on for a short while after engine is turned off if the temp is high at the upper hose outlet.

If swapping does not help and the temp is not high with sufficient coolant in radiator, the thermoswitch at upper hose joint on head needs to be replaced.

1991 Honda Accord Two Wheel Drive Automatic

my 91 accord coupe is acting weird first the car s light blinks they told me it was speed sensor replaced that still light on then they said its the tcm or ecm computer replaced that still same problem the car revs up and down on its own when in park the cooling fans stay on when car is turned off i have to disconnect battery so it can turn off i am very frustrated with this can anyone help i cant seem to find the problem. thanks

Hi maxima320, Seems the idling speed is too high or the EACV is faulty or malfunctioning tdue to lack of coolant. Use a jumper wire to bridge the SCS and turn ignition switch ON. Count the Check Engine Lamp blinks and let me know the code. Prolonged blinks = 10. Short blinks = 1.

ok ill try that jump i will let u know what is eacv? and is it hard to replace thanks

Electronic Air Control Valve = EACV. It is located on the intake manifold just behind the injectors with a 2 wire connector and has 2 hoses running from it, 1 to the Fast Idle valve next to it and the other to the throttle body lower end. Removal is not difficult.

I forgot to mention about the fans running after engine is stopped. It most probably is due to a bad fan relay, sticking in closed position, or there is insufficient coolant in the system which might relate to the surging.

Surging couls also be due to idle speed set too high. Check the base idling speed with EACV disconnected.

Engine Cooling problem
1990 Honda Accord 4 cyl Front Wheel Drive Automatic

cooling fan come on an off. when car is turn off.but when i turn the key on ,the fan stop running.

Hi taman,

Vehicle is equipped with a system to provide power to the fan for cooling when overheating has occurred and ignition switch is turned OFF.

Check the coolant level in radiator, if it is low, it would cause the fans to work when ignition switch is turned off.

If coolant level is correct and you do not have overheating issues, the fan switch located at upper hose housing on engine is bad.