I have a 2002 dodge ram 1500 4.7L engine. Air conditioning only blows cold air when vehicle is moving; warm air when idling... please help. Thanks!

SOURCE: Air Conditioning - blows warm

Hi

If the fuses are all ok and you can hear the aircon clutch clicking when you attempt to switch it on, then I think it may be time for a re-gas! You could do it yourself with a can of gas from an autofactors, but you wouldn't get the pressure right, and, there would still be old gas in there.

If you took it to a garage, however, they would **** out all the old gas, and then hold the vacuum in there for a while to check for any leaks. Then they would refill to the exact pressure with fresh new gas.

Regards

Geordie

Ned C Cook

• 3433 Answers
• Posted on Jun 19, 2009

SOURCE: AC blow cold air when moving but warm air when stopped

AC system appears low on charge

Harvey N Tawatao

• 3854 Answers
• Posted on Jun 22, 2009

SOURCE: 2004 Dodge Ram 2500 air conditioning

It sounds like your electronic vent actuator has gone bad, it's common to go bad and may need to be replaced. There are tinny gears that wear out and the vent actuator stops working. You can try this, turn the radio off first so you don't have to enter the reset code to activate your radio. Disconnect the battery for 30 seconds and reconnect it, if the actuator has lost it's base line and stuck in the open heat position, this will reset it, just make sure the setting is to cold and off before disconnecting and reconnecting the battery. If this does not work, then it's a bad actuator and Auto Zone should have the part you need and will have the step by step instructions for you to the job you self, I believe the dealer is a $415,00 repair cost for this. Good luck and keep me posted. 

SOURCE: Air Conditioner stops blowing cold air when vehicle is not moving

plus one on the cooling fan problem. if it was low on charge then as you slow down, condensor temps and line prressures would raise therefore it would cool at low speed and and not when moving since the incoming air would drop system temp,reducing line pressure and then cusing compressor to cycle. the auxillary cooling fans must be on whenever a/c is on, if not, thats your problem. get this taken care of because if you get stuck in traffic, your engine will overheat also if fans are not running

SOURCE: 2002 Dodge Ram 1500 - The heater blows cold air

the heater blowing cold at an Idle and warm while driving it,is usually low coolant in the radiator,remove the radiator cap when engine is cold,fill to the top,and fill overflow tank to full,if that doesn't take care of it,check the heater hoses at an idle and see if they are both the same temp,it might be a water pump not doing its job.