I spent all day looking for definitive answers and searching the forum.
NO JOY.

So please, help me out?
(Mods, if there is a better place for this post, please move it, by all means!)

I put 12 volts to the fan, it works fine, but there is no power coming to it.

The AC compressor is engaging, I can hear it. But no cold air.

Worked fine two days ago. No symptoms of failure.

NO CEL or codes.

No fuses blown.

swapped the relays around, no change.

I even disconnected the battery at the ground, then reconnected it. No change.

I have had the car 2 months now. I love it, but it makes me nervous.

Thoughts?

IS this the dreaded low speed fan resistor?

Please, Obi Wan! Your my only hope!

 

Per the Bentley manual, and confirmed by my ScanGauge, the fan operates at low speed at 221F, and turns off at 214F. The fan switches to high speed at 234F and remains on high until the coolant temps drops by 7F. Supposedly it also turns on when the AC is on and the AC system pressure reaches 8 bar (114psi)

What seemed to work fine - both AC and fan, or one or the other?
If the low speed fan doesn't come on with the AC, either the low speed resistor or the compressor is dead. Best way to differentiate is to get the actual temp and see if it comes on at 221F. Low speed is fairly benign, you pretty much know when high speed is on.
Use your gauges, Luke.

When you say there is "no power coming to it", what do you mean? When the AC is on? Where are you checking to see power? If the low speed resistor goes, power goes to the resistor, but doesn't get to the fan.

Logic was that the low speed fan died, then caused the failure of the AC compressor due to overheating. Don't know if that's what actually happened with mine, but my low speed was dead, and my compressor was dead, so it fits the scenario. Fixed the fan first (still no low speed with AC on and engaged), then replaced the compressor (all as normal.)

 

If your car has the 3 pin connector for the fan you can check the low speed resistor by measuring the resistance between the two top pins.

 

OKAY...
The high speed fan DOES come on. It even comes on AFTER the engine is shut down. I understand this is normal, so no worries...

But there is no fan coming on when the AC is turned on. I will replace that resistor, then see what's up with the AC.

What should be the resistance across the pins if it is a 3 pin connector?
What is a good source for a replacement resistor?
How does one test the AC compressor?

Thanks for the responses guys. PLEASE keep them coming. I am a noob to this car, but I appreciate the forum. I was a frequent flyer on the Impala forums back when I had one, and I have come to truly value this venue for information!