Question about 1998 Dodge Ram 1500 4WD

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99 dodge ram 1500 ac problem

Ac works fine in town at highway speeds blows hot air

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Recharge your system, it;s low on refrigerat, there is not enough liquid going into the evap to help maintain cooling, hence the speed of the compressor. install gauges to check pressures at idle, if not to spec , recharge. if it's low you have a leak to repair. also make sure your AC condenser is clear. GOOD LUCK. RDJRP

Posted on Aug 17, 2009

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My 97, 5.2 runs 200 without AC, if I turn on AC, it goes to 220. Replaced clutch fan, thermostat, water pump, and new cap. Backflushed block and radiator. No results. Why so hot? Only 92K on unit.


dodges run like that. if your worried put a 180 degree thermostat in. maybe even a 160 . wont hurt engine or fuel mileage . my 99 dodge ram 1500 sport runs fine with 160 degree one. hope it helped , good luck

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I have a 2002 Dodge Ram Quad Cab 4x4. The a/c runs great as long as the truck is moving, but as soon as you come to a stop it starts blowing warm air. Please help.


Generally if the a/c works fine at highway speeds but kicks out or slowly begins to blow warmer and warmer air as the vehicle is driven at slow speeds or is stopped the a/c condensor cooling fan is usually at fault. At highway speeds there is enough air being forced through the radiator, condenser, and oil coolers to keep everything working and cool but when the vehicle is moving slowly or is parked the electric and mechanical cooling fans have to be working to pull enough air through to keep things working. If the cooling fan isn't working or can't pull enough air through the a/c condensor the system will kick out once the internal pressure reaches a certain point. Once the vehicle is moving again the system can get rid of the heat that it has gathered from the passenger cabin, the pressure drops back to normal and the system cools again. I would start by looking for a blown cooling fan fuse in the fuse panel under the hood. Usually they are 25 amps or larger and run only the cooling fan.

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1 Answer

A/C blows hot air going uphill or pulling a trailer.


you will need to change the clutch fan, under load or high speed will heat up the engine and the clutch fan should ingage to pull more are through the radiator. Also at idle with no air moving through that radiator the clutch should ingage to pull air through.

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Check the evaporator coil by sniffing the vents,floor is best, with your tester.

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Your A/C sounds like it needs to be vacuumed
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I have a 2001 dodge ram 1500 my ac is blowing hot instead of cool


Have you checked low or high side pressure at idle?

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By pass both pressure switches one at a time with small wire or a paper clip. If comperssor kicks on replace the swich that you bypassed.
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