Thread: Air Con is hot, but sounds like A/C is on (condenser fans?)

There are two temperature switches on the thermostat elbow that relate to the AC fans - they can be easily connected to the wrong plugs. Swap them over.

Originally Posted by langy

There are two temperature switches on the thermostat elbow that relate to the AC fans - they can be easily connected to the wrong plugs. Swap them over.

That's the kind of answer I'm looking for! Simple. Sounds probable... Might have to check in the morning tho. Dark outside and not at home....

Cheers langy.

not sure why you'd check that unless you had parts out for other works...

Id start by bridging the LP switch and seeing if you get the compressor to kick in.

no i wouldnt.... if it was working before the head gasket and its not now take it back and say "oi, aircons not working, fix yer mistake."

Originally Posted by Blknight.aus

not sure why you'd check that unless you had parts out for other works...

Id start by bridging the LP switch and seeing if you get the compressor to kick in.

no i wouldnt.... if it was working before the head gasket and its not now take it back and say "oi, aircons not working, fix yer mistake."

Excuse my ignorance. LP switch?

I would also take it back if the mechanic wasn't 300kms from home where I broke down with blown head gasket. I will probably call, but it's a public holiday here Monday so probably can't speak to him until Tuesday. Hoping it would be simple and I can just fix it. Also, I'm always keen to learn a thing or two and do it myself.

LP= Low Pressure switch. Normally set to open circuit around 2 bar(g) on fixed air conditioning. I don't know what automotive A/C would normally be set at, but would imagine somewhere between 0 & 2 bar(g).
It stops the compressor from running with no refrigerant in the system, for 2 main reasons:
Compressors generally rely on suction gas cooling of the motor (not an issue for belt driven compressors). Too little gas = insufficient cooling of the motor which may = stuffed compressor.
It's possible to end up drawing air & therefore moisture into the system. Definitely NOT a desirable thing.
Any fixed A/C over a domestic fridge should have a HP (High Pressure) switch. Used to stop the compressor if the discharge pressure gets too high, usually due to a problem with the condenser air flow like a failed fan or a blocked condenser coil. Dunno if automotive systems would have a HP, but if yours does it's worth checking it as well.

For Mr J: The plug with the green & yellow/blk stripe wires are for the front temperature switch.
(If what I said before does not work, then try Mr BK's idea)

For Mr BK: Because that's what I did when I replaced my head gasket & the identical thing happened.

langy X 2