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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

93 Dodge Intrepid, Mindless Heater Control
Q: My heating and cooling unit has gone haywire on my ‘93 Dodge Intrepid. The blower will not shut off . It blows hot air for the most part although sometimes the air conditioner does come on. The push buttons seem to have a mind of their own. Sometimes they work and sometimes they don't. The dealer wants to replace the entire unit for $590.00. Help!!! Is this my only alternative?

A: The heater control unit on your vehicle is known for its mindless operation when failing, but at times, they’re not really failing, they’re just confused. I know that doesn’t make sense, until you know that the heater control unit has a computer module built into it. A stray electrical spike or static charge can send these units into wonderland. There is no escaping this unless the heater control module’s memory is erased. The preferred way is to remove the heater control unit from the vehicle and install a jumper wire from the power supply to the ground on the unit and let it set for a short time. This passive therapy is known for returning the heater control unit back to its old self once again. Without a wiring diagram this can be difficult to accomplish. So you can try removing both battery terminals from the battery and connect them together for 5 to 15 minutes. The only problem with this approach is that you cleanse the memory of the clock, radio and other computer components. You’ll have to reprogram the clock, radio stations, etc. The engine may run oddly for a short time because the engine computer has to realize that it’s hooked to something. They’re not that smart you know. This step will either return the heater control module back to its good old self or it’s really broken and it will have to be replaced. One other note: before you buy new, check into a used unit from an automotive salvage yard. I know salvage yard is not PC, but you have no difficulty in understanding what I mean.

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