ac electrical

[shamrock]

is ac electrical problems common on the 92 240sx? after having the ac refilled having major problems. for beginners it doesnt work and when i turn it on the engine makes a loud shreaking sound. and the sound appears when i turn the defrost on as well. can understand whats causing the problem??? :

[JeromeS13]

Sounds like the AC compressor is bad or the belt.

[benemorius]

It could be as simple as a loose belt, or it could be as bad as a seized compressor. It sure as hell doesn't sound like an electrical problem. I'd check the belt first.

[shamrock]

thanks for your reply. naturally i would of thought it was the compressor but the same sound happens when the defrost is turned on. thats why i thought it could have some electrical problem. apart from the sound the rpm drops.this is why it is so frustrating. any suggestions?

[pmkls2]

to check if the compressor is seized simply grab ahold of the front around the clucth and try to spin it. it should spin by hand pretty easily and it should feel relatively smooth without and binding feeling. after that check your belt tension and make sure it isnt slipping. also the reason the car does that when you hit the defrost is it cycles the compressor when on the defrost setting to dry the incoming air. it wont do that on defrost and floor setting just the defrost only setting. HTH

[benemorius]

No offense, but this is my suggestion:

It could be as simple as a loose belt, or it could be as bad as a seized compressor. It sure as hell doesn't sound like an electrical problem. I'd check the belt first.

You should pay more attention to it before asking for more suggestions.

(FYI: the a/c comes on automatically when the defrost is on)

[shamrock]

thanks for your help! i tried what you told me and it was exactly right! thanks again

[benemorius]