2004 Saturn VUE A/C weak at low rpm

Pressure has built up in the system possibly from a clogged orifice tube/expansion valve. Replace the orifice tube/expansion valve, thenPull a vacuum on the system and recharge.

How do you check an orifice? Oh the high pressure side it will be warm to hot to the touch. The cold low pressure side will be much colder 45-50 degrees. if there is little difference and the charge is good the orifice could be plugged.

Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

Have the system charge checked, it is very likely low, if it is you have a leak.

Just a little low on freon can make it get too cold and it freezs if you in position to check the freon level you'll find with the system on high and the engine reved up the low pressure is below 25PSI. fill it to reved up is above 25 and your problem will go away. Low on freon will make it cold enough to frezze up and then warm up as the air does'nt go though the ice. it'll work good as you start up till it frezzes and after it's stopped up with ice it blows warm (it's really too cold). the more freon in the system the warmer it'll all blow because all the pressures are higher and it's the difference in pressures that make it cold.

Did you get an answer? We just took ours in for compressor replacement to the tune of $1000.

Maybe low on freon

I agree with philip, i have not studied the electrical system. but to my best guess the electric fans are tied into the engine cooling system. when the engine is not requesting the fans to come on. then their is very little air passing threw the cooling package. When their is no cool air passing by the condenser this will not draw the heat out of the refrigerant leaving excess heat in the system and when the cab fan blows this is were the excess heat is getting dumped. then at higher speeds their is enough air passing threw the condenser and radiator to cool them both.

when you are stoped does the car idle fine. when the rpms are low the compressor does not get the pressure up high enough. you may need to get you idel turned up a little or your vaccume advance may have a vaccume leak.

Have the cooling system flushed- sounds like a clogged or faulty heater core. Can also be blown out with compressed air from the firewall hoses.i fixed mine like this- Make sure it is cool b4 removing hoses