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Cadillac Repair/heat doesnt come through vents.. change temp *digital* and it comes through with a/c???
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Question
well i got a 1998 cadillac deville. All digital dash of course. So the question of the day is... heat comes through defrost and floor.. won't come from dash vents. But! if you turn down the temp so the a/c turns on it will automatically start blowing from the vents. I'm in the process of selling this car and i showed it to somebody and he told me it was a heater core and he didn't want it because of it. I know its not a heater core because the heat infact works it just doesn't come out the vents.. seems like a vac line to me maybe you can give me some points of interest.. I'm new to caddys and im trying to get out of this car as cheap as possible! lol thx!!!
Hello,
it is a vacuum problem. It could be a vacuum pump under the hood, broken vacuum line, vent door vacuum or in the heater/A/C control.
To diagnose, if you used a hand held vacuum pump and eliminate the items listed, your problem would be taken care of. For some goof to say the problem is a heater core, it surely shows his ignorrance in these repair areas.
Rob
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| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | thank you very much.. i called him alot more than a goof but hey its his loss.. its a nice car.. that truely is the only problem with the car lol. thanks again much apreciated! | ||
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Rob Painter
Expertise
Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?
Experience
Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.
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