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Question
I own a 02 STS Caddy and I have a problem with the defrost. Heat is red hot when the car warms up but comes out the vents only and nowhere else. Selector on the climate control allows you to change where heat goes such as vents,floor,defrost but nothing changes, still comes out the vents only. Is this a vaccuum gone bad? If so, where is it located under the hood, thanks
Hi Henry,
It definately sounds like a vacuum problem, but to be perfectly honest with you, being that all this stuff is computer controlled, I have no idea of where to tell you to look for the problem.
I say this quite often and feel it is good information. Either search google for "Helm" who prints the service manual for your car or get a manual from Ebay.
If you are keeping the car, it is a cheap investment to have a service manual for the car and that way, you can diagnose a whole host of problems.
Rob
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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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