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
Test drive to show my head gasket symptoms
21 - 38 of 38 Posts
This was the temperature when I turned the heater on for a minute to try and force the fans to come on. Once I double checked and realized they weren’t coming on, I went ahead and turned the car off and that was it.
![Speedometer Trip computer Odometer Tachometer Gauge]()
AC doesn’t work. It’s a Cadillac. Lol.
Jokes aside, of course it doesn’t work, it’s a Cadillac.
I’ve owned 8 Caddys, the AC has never worked. Lol. Actually, now that I remember, it worked on 2-3 of them, but only briefly.
Maybe I’ll try with the defrost in a bit.
Do you have a bidirectional scan tool that will allow you to turn the fans on and off? I would check to see if the fan connectors are connected and turn on the a/c regardless if it works or not, you could try clearing the climate control codes just to see if that will allow the fans to run. The a/c has worked on all the Caddys I have owned with the exception of my first 1 a 65 Sedan Deville. Some times a yearly recharge is needed but the systems seem pretty durable to me. Basscatt may know if you can toggle the fans with the onboard systems
Negative.
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
22,620 Posts
===================
Would that qualify as turning on the AC?
the electric cooling fan automatically comes on
when the AC (Air Conditioning) compressor is engaged -
set the CC (Climate Control) system in the AUTO (Automatic) mode -
set the temperature below ambient (outside) -
Fyi: for anyone who reads this.
Autozone will rent you this combustion gas testing kit including the test fluid completely free of charge. All you have to do is leave a $40 dollar deposit that you’ll get back when you return the kit and remaining fluid. That’s pretty nice of them considering you might be in for some bad news when using the test kit.
![Liquid Hood Fluid Automotive lighting Drinking water]()
Autozone will rent you this combustion gas testing kit including the test fluid completely free of charge. All you have to do is leave a $40 dollar deposit that you’ll get back when you return the kit and remaining fluid. That’s pretty nice of them considering you might be in for some bad news when using the test kit.
??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
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
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?
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!".
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!".
I like it set to Auto. My heater works great whenever I turn it on.
And it’s nice that your car runs great, it should, considering you pretty much never drive it! Lol.
Cheap shot. lol
lol. For many years it got its right fair share of "driving". I would not hesitate to disconnect the Battery Minder, load up the car and head for Florida tomorrow morning. A/C would work, level control would work, cooling system would work. No problems. lol. Might even detour to my runway/farm road and do a 120+ run just for grins and kicks. lol.
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.
lol. For many years it got its right fair share of "driving". I would not hesitate to disconnect the Battery Minder, load up the car and head for Florida tomorrow morning. A/C would work, level control would work, cooling system would work. No problems. lol. Might even detour to my runway/farm road and do a 120+ run just for grins and kicks. lol.
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.
Same here, other than normal maintenance all my N* cars have been fine running vehicles with few problems and I don't think twice about taking road trips with just checking fluids and tire pressures. Sure alternators, shocks, belts and pulleys etc need attention on occasion but these cars are almost 20 years old or older so it is expected
Alright, if that’s what you’re hoping for… Smh.
Fyi: I turn the heater on maybe once every 2 months or so. I’ve always looked at it as something that by the time it’s working, my own body temperature will have reached its own comfort zone. In other words I don’t really ever use it. Growing up I always slept with only 1 blanket no matter how cold it got and if it was too cold I slept with a jacket on and still kept at least 1 window open. No heater because it wastes too much energy. I never drink coffee either. I love the cold.
I am not going to derail this thread BUT I have to make this comment reading the posts here. I now own two of these cars 2000 Deville, 2011 DTS (believe me they are the same car) They may have been good when they were new but I tend to agree with 2K. They do not age well. A lot of things go wrong with these cars in the first 10 years that never happen to other cars, even cheap econo box cars. Why I just bought this 2011 DTS I'll never know.
So far we found out the purge line is clear but the fans don't come on. That must be why it only overheats at idle? Now to figure out why the fan doesn't work.
Here's his later fan wiring schematic - The two 4-blade relays can be inserted either way - internal diagonal wiring. The 5-blade goes in one way only. Fan motors are relay-set to series connection (voltage drop) for SLOW speed operation, parallel (full system voltage) for FAST.
![Line Font Parallel Rectangle Slope]()
2001 Eldorado 2008 DTS 2005 XLR 95 Eldo'11CTS-V,'66 corvair.'03 deville,'00 deville
Joined
·
2,423 Posts
My money's still on the fans.
Look down between the fans and engine to see if the fan connectors are in place. Whom ever installed the radiator may have forgotten to replug them.
Look down between the fans and engine to see if the fan connectors are in place. Whom ever installed the radiator may have forgotten to replug them.
21 - 38 of 38 Posts
