Blower motor resistor

(1) Blower Motor and Connector (2) Blower Motor Relay (3) Blower Motor Resistor and Connector

I have had a perpetual problem with the blower on this blazer. This is now the 4th time that I have progressively lost the blower control on this car. Initially the dealer tried to fix it by replacing the blower switch, but this failed in short order. The other 2 times, with two different repair shops, the problem has been determined to be the blower fan resistor. The last blower resistor replacement was about a year ago. It worked beautifully for about 3 months, I started to lose the lower settings, and then eventually it stopped working all together. It seems to me there must be a bigger cause for this same issue to continue to recur. I'm looking for help and suggestion on what may be behind the repeated failure. Also, we're willing to try the repair on our own this time, but need help locating the resistor to replace it (and whatever else you may determine could be causing this)

Based on your description, I feel the blower motor itself is going bad and drawing too many amps. As a result, the first thing to go is the resister. Have the motor tested for amperage draw and let me know what you find.

Joe

I was able to locate the resistor and pull it out and check it. The resistor seems to be just fine. So I went "upstream" to the relay. One of the contacts inside of the relax was fried to a crisp, and had actually melted part of the plastic casing inside. While I can replace the relay, the plug that goes into the relay is another matter. I cannot figure out how to remove and replace the plug end - it appears to go straight into the wiring harness. Thoughts?

If the connector to the wiring harness has melted down, there should be small clips that when depressed with a small screwdriver allow the wiring to come out.

LEt me know if that is what you mean. I would also check the draw from the motor. It sounds like it is drawing too much power.

Will check the line draw to the motor and let you know. I found the clips this weekend, but the wires did not seem to want to come out and I didn't want to pull on them too much since I wasn't sure I could get a replacement part. Will check on all of it and get back with you. What would the name of the part (or part number) be for the piece that attaches to the wiring harness and slides up into the blower motor relay?

Are you refering to the plug?

yes, I guess it would be the plug... see pictures attached... it burned through the side of the casing or the plug it shorted so badly... but it is all cleaned up and did work when connected to a new relay. I will need to buy a new plug to put on, however... and will test the fan this evening and let you know.

Not great quality taken with cell cam -but I think you can see it enough

Actually, the pictures are great. It looks like something is drawing too much power and overheating the connection.

Let me know what you find.

Heater problem
1998 Chevy Blazer

fan motor just up and quit-put in a new resistor but now only have a fan on seletion #3. No speed on 1, 2 or high. Cannot find anything in my manuel or Haynes repair manuel about any fuse or anything for the blower fan. Any info would be appreciated

Hello, maybe something wrong with the speed switch? The high blower speed doesn't use a resistor. High speed fuse, hvac 30 amp, underhood electrical center.

The blower relay has to be energized for the high speed. The feed for the control side of the relay, comes the hvac controller on the dash, hi speed selection. That relay is not energized for the lower speeds.

Heater problem
1998 Chevy Blazer 6 cyl Four Wheel Drive Automatic 119.00 miles

i can not locate the resistor

the resistor is #2

1993 Chevy Blazer Four Wheel Drive

where is the location of the resistor for the heater in a 1993 chevy full size blazer

find the blower motor,
engine compartment side of the firewall
on the passenger side.

the resisters will be a few inches away from the blower.
the air going past them keep them from over heating.

i found mine behind the glove box attached to top of air box