dogbiscuit· 2001 Deville
No but defrost would, does the a/c work? I do not know if the fans will come on if the system has a low charge or is otherwise disabled
AC doesn’t work. It’s a Cadillac. Lol.No but defrost would, does the a/c work? I do not know if the fans will come on if the system has a low charge or is otherwise disabled
Negative.Do you have a bidirectional scan tool that will allow you to turn the fans on and off?
===================I turned the “heater” on @90 degrees for maybe a minute. The fans didn’t turn on after I did that. Would that qualify as turning on the AC?
Reason I asked is because it’s on Auto setting, same as when using the AC. Only difference is the temperature it’s set at. One would assume it’s a fine line between whether it’s on AC or the heater? What happens if you’re dead center? Are you still on AC or heater???Fans run when heater on ??
Read the fine print in Post #6. Already covered.
NO. Fans run when some A/C compressor function is set, including DEFROST - not for cooling but to insure airflow through the condenser in front of the radiator at slow speeds or when stopped
I like it set to Auto. My heater works great whenever I turn it on.If your A/C is non-operational then the compressor will not be commanded ON, even in AUTO, (pressure switches, bad relays, poor wiring ??) and so the fans will not be commanded ON. Take the HVAC system out of AUTO (it doesn't work for you anyway), and go to some manual mode. Cadillac likes the HVAC panel Driver and Passenger temp settings within 5 degrees of each other.
The temp gauge indication itself has nothing to do with fan speed controls. That's a signal from the ECT sensor to the PCM - and if your gauge works (it seems to) then you have other problems, perhaps associated with a dead A/C system. That "gauge" is highly damped in its movement between 188 and 210 degrees. Too many owners complained when it actually moved in response to changing operating conditions. One reason we now see so few real oil pressure gauges.
"Cadillac A/C never works" ???? My A/C has worked flawlessly for the car's entire life. Never a second's problem. Straight from the hip, based on your myriad posts on various problems, it appears that your car is a patchwork quilt of fudges and jury-rigs. Be glad that it even runs.
We had an old Navy sing-song for pretty ships - "Paint her up and clean her right - for shine she must and run she might!".
Alright, if that’s what you’re hoping for… Smh.Go ahead - bury your head in the sand - AUTO may well be contributory to your fan troubles. You can set the system to HEAT with a desired temp setting and it will heat just fine whenever you turn it on.