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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 12-01-2011, 09:15 PM
micwrath micwrath is offline
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Default A/C Fuses pulled and heat works again?

Ok I have been working on my heat problem on my 2001 dodge ram 4x4 5.9 for 2 years! I found out my A/C would stay on when I turned my heat on? Hmmm weird? My gas miliage was so wrecked becuase of this. I just took out the A/C fuses(the 10 amp and the big a/c relay fuse) The heat works! WOW! Now my questions is will taking out the fuses hurt my a/c system while i drive my truck in any way? Also does this mean my heating and a/c control system(were the knobs are) needs replacing or something? Please if you know anything about this weird problem help me out and I can help with the other problems i have had with my truck and fixed.
Thank you so much!
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Old 12-01-2011, 09:19 PM
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Welcome to the forum.

I can't say that I've ever heard of this. With the a/c compressor isolated, there should not be a mechanical problem with that.

The compressor may not be disengaging. Have you checked the compressor clutch and it's electrical circuits?
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Old 12-02-2011, 11:16 AM
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Try checking the thermal resistor/relay in the heat-A/C box on the passenger's side under the dash if you can rule out the heat-A/C controls on the dash. It has a small circuit board on it that controls the mode. I'd also check the refrigerant pressure.

Are you sure you're looking at the Clutch correctly? Just to clarify what MD said. Does it always spin or is it always stopped? Just so we know if it's engaged or dis-engaged. Humor us if you can.
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Old 12-08-2011, 08:48 PM
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Okiespaniels Okiespaniels is offline
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The system is designed to cycle the AC on a regular interval, but not run it all the time. The timer/relay usually cycles the system for about 10 seconds and then shuts it down for determined time. This has been around for years and all mfrs use it.

You should NOT disable this system! The cycling distibutes the compressor lubricant through the system, filtering it and makeing sure the compressor is properly lubricated.
You will significantly shorten a very costly piece of equipment by disabling the cycling function. Once it is working properly you should have heat unless you have other issues that the ac cycling is covering up.

You can find out the delay timing for your system and check it. Replace the relay if it is bad.

Last edited by Okiespaniels; 12-08-2011 at 08:50 PM.
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