what makes my car air con. go off when I give it gas and come back on when I let off the gas?

Question

The air-conditioner works good except for when the car is under a load. If I'm going down hill or let off the gas the air works fine.

Answer 1

It sounds like when your accelerating, the air switches from panel to defrost. If thats the case, you have a vacuum leak. Could be a source vacuum leak or the mode door actuator leaking. Find a manual and look at the vacuum diagrams for the a/c. You'll need a hand vacuum pump to test the circuits...

Answer 2

Depends on what you mean by going on and off. A common problem in various Chrysler vehicles is that under acceleration or heavy throttle, the vacuum drops and allows the cooled air to be diverted into the heater ducts below the dash, rather than through the vents in the dash. This can be solved by changing the spring in the diverter, or simply disconnecting the spring so the air diverter won't move. Of course, come winter, make sure you reconnect it to get the air through the ducts below the dash.

If the compressor is switching off, and thus the air is no longer refrigerated, you probably have an alternator or voltage regulator problem of some sort. That should be easy for a mechanic to check by hooking up your car to a meter, and checking the output of the charging system under varying loads.

Answer 3

one thing u can do is start the car, with the a/c on, and pop the hood and find the throttle body, and find the a/c compresser. now first make sure the center of the pully is spinning, if not, wait for it to start. then rev ur engine and see if the center stops spinning and start back when u let go. this is easier with a buddy inside on the gas. if it does stop when u rev and start when u let go then ur clutch needs replacing. it is also possible that when u gas it, the ignition and fuel injectors are robbing it of enough volts from the battery that it goes off. this is very possible if u have a high powered sound system and r jamin when this happens

Answer 4

That's somewhat counterintuitive. Generally, car A/C runs off engine power, and increased power increases A/C pressure. I would speculate that your A/C works somewhat differently and is just getting a little feeble (or else it wouldn't be noticable).

Answer 5

without knowing what kind of car, it is hard to say. It could be the belt, but most newer cars have systems designed to disengage the AC clutch when more power is needed from the engine.

Answer 6

I have a friend that says "Not definately, but possibly a faulty diode pattern in his alternator" or "depending on what he actually means by going 'off' and 'on', it could be a slipping belt". However, if it switches to heat when you let off the gas, you have a very serious vacuum leak.

Answer 7

hahaha it's a bit gassy arount here......hope your hubbie books in a hotel for tonite,seen the troll on patrol been in here too,well no surprise there,they like a bit of a pong lolol,soz got to go outside for a mo,I am unsociable lol......sbd's here,silent but deadly BWAHAHAHAHAHAHAHAHA

Answer 8

Your a/c draws it's power from your engine. When the engine is already working hard there is less power available for the a/c.

Answer 9

It sounds to me like loose or even worn belts. When you gun the engine they slip, under normal wear they still have traction.

Answer 10

it may be loose belts or the compressor clutch is messing up