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About Skip Bollinger
Expertise
Heretofore, I will NOT answer any mechanical question. I am not qualified and can only offer speculations. You are better served by others that are true Techs. With that being said, please only ask about parts and locating obsolete Auto Parts. Thank you. I have the ability to locate quite a few mechanical parts for American made vehicles fron the 1900`s to present. Some are OEM and some are aftermarket. This would include engine, brake and chassis parts. Body parts and trim are VERY difficult to find but you may inquire. If you need assistance in repair, I have illustrated books for major American manufacturers that show some illustrations BEFORE 1974. If needed, I can supply repair manuals for your specific vehicle. PLEASE REMEBER I'M A PARTS SPECIALIST, NOT A TECH!! Thank you.. Skip

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Too many to list but they run from Europe through America and to Australia.

 
   

You are here:  Experts > Industry > Transportation and Logistics > Automotive > 2002 Dodge caravan - turning the defrost on will result in a loud noise

Automotive - 2002 Dodge caravan - turning the defrost on will result in a loud noise


Expert: Skip Bollinger - 4/20/2008

Question
QUESTION: I hear a loud click when I rotate the funtion button to the defrost position, however if I move it back to just blowing air in the cabin the sound goes away.

I am not sure if they are related but I remember last summer hearing a similar noise while turning the A/C on and off.

I just replace the resistor for the blower and this doesn't fix it.

Is it the compressor? Blower?

Thanks

ANSWER: G.
 I am a Parts Specialist, NOT a Tech but will off these thoughts for you to ponder.
 Your mail is a bit confusing. At first you say you hear a "loud click" when you place the selector in the "defrost" position. Then you say that when you move the selector to "just blowing air"..."the sound goes away". One statement leads me to believe the noise is momentary and the next statement leads me to believe the noise is ongoing. I'm confused. Regardless...
 I'm going to guess the noise in in the diverter door area under the dash. From the information you have provided, it has nothing to do with the compressor or blower. You may have to get on your back on the front floor board to pinpoint the noise. You may need to have someone else move the selector while you listen for the noise.
 I'm sorry I'm NOT a Tech. IF I'm wrong, don't hammer my chops. I'm just trying to give you some direction. This is something that can be expensive to repair. It isn't the price of the part but the time it takes to get the dash apart to get to the part. Good luck...
Skip

---------- FOLLOW-UP ----------

QUESTION: Reading more about my problem I am more incline to believe that I have a leak on my A/C system. Moving cursor to the defrost position requires help from the A/C compressor to clear the moisture from my cabin but because I might not have any freon the compressor stop working thereofre the noise. If I just blow air in the cabin there is no much of a noise at all.

Am I on the right track?

Answer
G.
 If the system has no freon, there is a "low pressure switch" that keeps the compressor from coming on. If it has no freon AND oil, it will self destruct. It is a self preservation system designed for the compressor. No freon, no oil no work..
 I can't understand how you can think the compressor is not working but making a noise...???
Skip

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