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Question
I have an 84 coupe de ville (4.1).
Once the cold came, when I put the heater on, I can hear the heater position thingy change position, the heat is there, but no fan. Occasionally, it just comes on. As long as I don't turn off the ignition, it keeps going, but once I do, it doesn't return.
In general, it just doesn't work. I've looked for the fuse box, and can't find it, in case it's just a fuse.
Help would be really appreciated.
Bill W
Hello,
These cars were notorious for blower problems. On the passenger side of the under hoof area, there is a blower speed module that will fail. About $300 for the part if you can even find one. It is a non-servicable resistor module.
Eventually, it will completely fail and then it will stay running with the key out of the ignition until your battery goes dead.
The only correction if you can't find a module is to have a hard wire connection with an inline fuse and a toddle under the dash. You need to run a power wire to the blower and the togle on switched power.
You end up with high blower and off. No middle speeds.
I don't know how many of these cars I saw wired like this-hundreds?
At any given time when these cars were only a couple years old, I could count three or 4 cars getting new modules at the Cadillac dealer. Very, Very Common!!!!
The reason you don't have a blown fuse is because it would not work intermittently.
http://www,autotheftexpert.com
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| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | His info was clear and right to the point and described my "plight" correctly. Thank you, Rob. I would like to follow up a more definitive question, but can't seem to find the thread. | ||
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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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