AC question?

[MY SHO]

I was looking for the low pressure switch to jump out to see if my compressor works i know im low on freon, but i want to see if the ac clutch engages at all...Where is the AC low pressure switch located? Thanks in advance... Also i tried installing freon and it would not take any could there be a possible blockage in the line? or because the Compressor is not engaging to take the freon?

 

[St Louis SHO]

on the dyer at the firewall (ATX) or just rear of the radiator on the lower left on the dryer (mtx) (I think). Sometimes you have to jump the switch to get them to take refrigerant.

 

[93rev2sev]

A/C pressure switch on a automatic is right up against the firewall. It's under the sight shield on top of the coffee can lookin thingy

 

[MY SHO]

Im sorry its a 5spd stick so thats near the rad? where is it ? is it easy to get to the switch...?

 

[93rev2sev]

You can reach your hand between the battery and the radiator...it's down about 10 inches...on top of THAT coffee can lookin thingy.

 

[MY SHO]

You can reach your hand between the battery and the radiator...it's down about 10 inches...on top of THAT coffee can lookin thingy.

Thanks Ill give it as try and post back my results....

 

[MY SHO]

Well i tried jumping the low pressure switch and it turned on the compressor kicked in....I tried to put the freon in and it wouldnt take when i turned the valve open it went right the the danger zone of the gauge and would suck in the freon? Now what....lol...any suggestion would be great thanks...

 

[MY SHO]

Anyone ? ....I just would like to have the AC work....

 

[St Louis SHO]

Well, the pressure is going to be high while it is sucking the gas in. It will go back to normal when the can is empty. R-12 or r-134a? Are you putting the freon in the high side or low side also?

 

[projectSHO89]

Yep, the gauge will read the can's pressure, not the system's, as long as the can's valve is open. Depending on the temp of the can, you might see pressure readings of anywhere from 50 to 90 psi from the can.

...assuming you didn't connect to the high side which can result in the can becoming an IED in your hand.

The can's own pressure should be enough to "make" the cycling switch. Many jumper the switch to get the process started.

Steve

 

[itwonder]

Is is possible you connected the freon can to the high pressure side service valve instead of the low side valve?