Are these two on the same electrical circuit or have some sort of shared control through the HVAC module? Lately, my blower motor will cut out intermittently and in turn the cooling fan will shut off while the car is at temp for the cooling fan to kick on (darn thing almost overheated in a fast-food drive-thru). Mainly happens at idle. I verfied that the cooling fan does work still by turning on teh A/C.
It has me confused chasing wires...
forgot the e-mail replies...
i do not think they are on the same system....although i might be wrong. as far as i know the fan is independently controlled when the engine gets to a certain temp.
the interior blower should always work regardless....
if you find out diffrent let me know. just my 2 cents
- Cameron (CaliforniaCavalier)
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www.csc-motorsports.com (my new NOR-CAL car club site!)
Okay first off, two totally different circuits.
Since you have veried operation of the cooling fan, this eliminates the cooling fan itself, the fuse, and the wiring. A faulty ECT sensor will cause the fan not to come on when the car hits 195F.
Your interior blower motor. This can be caused by a loose connection, the contacts are only making a connecton part of the time, a loose power or a loose ground wire.
- 2004 Cavalier - 124k, owned since new
The problem is that both fans are shutting off at the same time sporadically while testing it while the AC is on, and nothing else electronic is shutting off.
As long as the blower is spinning, everything is fine.....
Thanks for the feedback, though. Looks like more wire chasing in the AM
You might underestimate how hot the car needs to be for the fan to come on. It has to get pretty hot.
I wonder if there's a problem in the HVAC panel or the wiring from it that's cutting the signal to tell the A/C to be on.
When you turn on your A/C, obviously the blower comes on. The car also turns on the engine fan to bring air through the condensor.
If the car isn't hot enough to run the engine fan on it's own, and that HVAC signal is lost telling it to put the A/C on, then it will do exactly what you're saying. Turn off the blower and rad fan.
