Question about Dodge Ram 2500

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I own a 2002 2500 4x4 diesel when I step on the brakes sometimes the ac will kick off and blow hot air in, to fix I turn off ac switch just for 2 to 5 seconds and turn back on and it blows cold air again. Could it be vacuum?

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Vacuum. Your brakes probably work off of it too so it feeds all of the vacuum to the brakes and pulls it away from the A/C. I had an S-10 Blazer that did that.

Posted on Sep 06, 2010

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Posted on Jan 02, 2017

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My 2000 Ram 2500 AC blows cold until I step on the breaks. As soon as I break it starts blowing real hot. Starts cold again after I turn it off and turn it back on. Break again, it blows hot again...


check for a fault in the climate control module that is affected by a power surge/ depletion from the brake circuit. It would appear that the ac compressor is being switched off by the fault and switches on again when you recycle the switch( could be a relay to the ac compressor.)

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Does the compressor kick in when you turn it on?(if not it could be the a/c switch or the power to it, the a/c clutch wire connection, the clutch itself, or it's low on freon) You should hear the clutch kick in when you turn the a/c on. Low freon will also cause the clutch to not kick in. Remove the low-pressure switch plug and jump it with a piece of electrical wire. If the clutch kicks in, you just need to add some freon. Put the plug back where it was after you remove the jumper wire.
Is the belt on and adjusted to the right tension? If the belt is loose it won't cool as good as it should.
Check the freon in the system with a gage. If it's low, add some to the right amount and see if it cools. If it is overcharged, it will blow hot air, too.
The heater control valve slider should be all the way to the left so hot water isn't allowed to circulate through the heater core which would also make it blow hot air out the a/c ducts.
Good luck, they can be a pain, but with careful, step by step troubleshooting it can be fixed. There is plenty of information about a/c online to help you out. Try googling in: auto ac troubleshooting tips for more info. garcuda

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Have the ac system check professionally as there are 2 control switches in the system that prevent the compressor working if there is either insufficient gas or excessive gas

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I have a 2000 Dodge Ram 1500 that will blow cold and hot air for only a few minutes. After that is only ambient air temps. It is a 5.7 ltr, automatic with only one set of climate controls. The heater core...


you say it will blow cold and hot air for only a few minutes. You don't say but I assume you mean will blow cold a few min. when turned on AC max , blow hot only a few min. when turned to heater hot. Assuming thats the situation and you say AC charged and shows good on the low side -you should charge the AC to a full charge on the low side will cause problems with the AC air compressor kicking on and off. I suggest while the engine is running and turned to AC cold max watch the AC air compressor clutch to see if it does indeed kick on and off if so charge completely. As far as the heater make certain you coolant is all the way to the top and the best way to do this is when engine is completely cold remove radiator cap and fill completely and completely close cap then fill overflow container just to the cold level. That should fix your problem.

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You may have 2 separate problems, check the bower motor resistor first, if it's bad replace it and THEN you should have the fan blowing on the lower settings.

If the ac turns on after you fix this then problem solved, if not it may be unrelated have a pro look at the ac.

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No cold air


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