Intermittently cold air will blow for a few minutes?

2005 V6 4.3L single cab silverado 102,xxx miles and Idk what kind of compressor it is

If you read the part description on rock auto it shows two different parts one for a denso compressor and one for another compressor.See if it says denso on the compressor or something else.Also if you click on the part number at rock auto it will tell you all the vechiles the part fits.So that way if you went to pick apart to find it you would know where to look.It fits a pretty wide range of vechiles.

OK I will check that out and let you know also I have another question my oil gauge is supposed to be at about 60psi I guess I have good compression but the needle sits right under 40 and goes up to 60 when I'm on the gas and my speedometer will just suddenly quit working also I heard maybe the oil sending unit for my oil pressure probably do you have any ideas on the two

I looked and didn't see denso on it anywhere or any other words part number for four seasons was 77348 and AC delco was 1521130

Heres your oil pressure spec at 1,000rpms min 6psi at 2,000 rpms 18psi min and at 4,000rpms 24psi min.As far as the speedometer have the computer scanned for codes let me know the exact code numbers you have not code descriptions.

The oil itsnt supposed to be at 60 on the gauge at all times and it doest drop all the way to zero when truck is off and there are no codes on the truck

So you figured out which clutch it is?

When the gauge wont drop to 0 unplug the oil sending unit does it drop to zero then?

I found right compressor but it didn't say denso or anything else on it when I checked part description

OK I will try that do you know where the unit is or should I YouTube it

Oh so the pic matched yours?

Left rear of engine you can look up what it looks like at rock auto.

Yes it looked correct I am just gonna get the clutch and it did look the same and the compressors it showed looked the same too I'm pretty sure I have the right one at least sure enough to purchase it

You might as well get a clutch at pic a part i would those clutches arent cheap new.

OK I will check it out and get back to you. Any ides on speedometer I was thinking maybe the sensor on the outside of the trans or maybe bad sending unit but not for sure

Most likely the output speed sensor or the wires or connections going to it.As far as the oil pressure if the pressure goes down after its shut off after unhooking the sending unit with the key in the run position then bad sender.

I can jump my AC over at the relay and it works put relay back in will not work.

Good afternoon.

Did you check for two powers to the relay?

You have a control side and a load side. If you jumped the relay at 30 and 87, that is the load side.

The PCM grounds the control side to turn on the compressor based on inputs from the pressure switches.

Did you verify Freon pressures?

I attached a wiring diagram for you to view. Check the fuses listed for power on both sides with a test light.

Check for power to the low-pressure switch as well. The high-pressure switch is a 5 volt sensor. Verify power to that sensor with a voltmeter.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak



Roy