AC help, what's up? (1 Viewer)

[Mace]

 

[1972FJ55]

when things are off, i see 75psi static. when it runs the red gauge goes to zero (high side i believe. upper most attach port on the compressor) and the blue goes to 105.

Is it possible the gauge lines are hooked up backwards? I've never heard of the high side going to zero-that would be more characteristic of the low side with a bad expansion valve.

 

[Miloslavich]

Thanks for the help gents. I greatly appreciate it.

For now, i'm going to start simple. have a shop reclaim the R12, change my expansion valve, then go from there. I think the expansion valve has a blockage.


will update after i find out what is going on.

cheers!

 

[dmjay]

Same thing was going on with mine.
It was the TX valve.

 

[vipergrhd]

Get a Denso or Toyota and stay away from China copycats.

 

[DentonDentonUSA]

No one's listening to Mace, but he's right. From what you have described I wouldn't diagnose it as a bad expansion valve unless you have the suction and discharge mixed up in your explanation. Take another look at the chart above.

 

[Miloslavich]

so to answer the multiple concerns of a backwards hookup of the lines, i put the red hose (highside) onto the physically highest port on the compressor. (closest to the engine block) and put the blue on the lower port (low side i assumed) which is closest to the tire.

now, unless thats hooked up backwards, im getting a high reading on the blue (low) of 105 psi while comp is running, and 0 Psi on the high.

if these are backwards, then i'd be seeing 105 high and 0 low.

regardless, I have a brand new in box Denso expansion valve, which means that before i buy a denso compressor for 300 whatever, i really ought to have that put in and give that a shot.. right? seems the most logical thing to do.

 

[DentonDentonUSA]

Yeah you've got the hoses flipped. Either exp valve or charge.

 

[Miloslavich]

roger that. I flipped the hoses and tried to add more refridgerant. No dice. the system will not accept any more freon.

So at this point its time to reclaim the R12, swap that exp valve, recharge and go from there. if still no cold air then I'll reattack