2004 pontiac sunrise surges when a.c. on and air not very cold. Tried to put freon n and said it was full.

You probably have an air bubble and therefore doesn't have enough anti freeze in the system. Carefully remove the radiator cap when the engine is running and verify it and/or notice the hot/cold marking on the overflow tank. The system needs to be full to heat.

mass air flow sensor or a cracked air intake snorkel can also cause this problem too I recommend to check fuel pressure when this happen it should be close to 45psi also when the engine is stopped the fuel could be leaking down to the engine

Has anyone checked the system to see if it is full of freon ? If it is full, you could have a problem with the HVAC control module.

check and make sure the a/c compressor is turning on when the a/c is turned on. if it is then make sure the cooling fan comes on, if the compressor is not working then you may have a faulty low pressure switch, you can unplug the electrical connector and test the harness side of the connector by jumping the 2 terminals using a paper clip to see if the compressor turns on. if the cooling fan is not turning on it will cause the a/c system to not operate to reduce the chance of the vehicle overheating when the a/c is turned on. hope this helps

When the compressor kicks on, is the air from the vents blowing cold? If the air isn't blowing cold, then your problem could be that you may have water in the system. I had a '93 Chevy Z71 that wouldn't blow cold and thats what my problem was. System needs to be evacuated and refilled. Good luck bro.

I don't have a solution but my old 2004 X-type has that problem when the outdoor temp hits bast 85 degrees or so. Will be interested in any fixes... I've had the outdoor thermometer changed and freon refilled, etc. but having the same issue...

the first thing is to check the fuses, then check to make sure the system has enough freon in it, with out freon the system will not turn on and you will get hot air,and the last thing to check if everything is working correct would be the blend door, make sure it moves from hot to cold air selection.

deifinitely leaking...most likely spot is the condenser and accumulator..could also be at the compressor.

Sounds like your freon is low.Maybe a leak in the system.Make sure the air condition pump is working.