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david craig
david craig, Auto Mechanic
Category: Toyota
Satisfied Customers: 3744
Experience:  owner/mechanic at 3D Automotive
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Auto A/C question: 97 4runner, new compressor. Cold an hour

Customer Question

Auto A/C question: 97 4runner, new compressor. Cold for about an hour then warm. Clutch still engaged. I shut it down for just 5 minutes, then start up and it's cold for another hour or so before going warm. Vehicle is in a remote location, so I'll have to perform the next troubleshooting steps.
Submitted: 1 year ago.
Category: Toyota
Expert:  david craig replied 1 year ago.

Hi Im David, A partially blocked exp valve, or a low refrigerant charge could cause the pressure between the compressor and valve to rise faster than normal. You would get cold air for a while, then the compressor would kick off until the pressure drops enough for the a/c amplifier to turn the compressor on again.

Customer: replied 1 year ago.
When it goes warm, I lift the hood and observe the clutch still engaged. I intend to bring a gage set my next trip to Baja so I can report some readings. I'm wondering if my service guy here didn't totally clean the system after the previous compressor failure that might have thrown some debris into the works.
Expert:  david craig replied 1 year ago.

its very possible, but having a manifold gauge setup would be the best way to troubleshoot

Customer: replied 1 year ago.
OK, stay tuned. Maybe a couple weeks before I go down again. No phones there, but I do have internet. It's a gorgeous little town, but nobody who works on A/C, and*****back to US so I fly.
Expert:  david craig replied 1 year ago.

ok. will do

Customer: replied 1 year ago.
Writing from Loreto, Baja. After about 1/2 hr of mostly 60 mph driving I pull over and gages read hi/lo 150/15, ambient 105 deg F, about 80 deg out of evap, but as I idle the output keeps getting colder. After 15 minutes at idle: 180/28 and 60 F out of evap. BTW, when I first opened the hood, the tubing at the low fitting was frosted. Needs freon, yes? Just recently did a new compressor, so I was assuming that shop gave me a proper charge.
Expert:  david craig replied 1 year ago.

those are the numbers the gauges are dropping to before kicking back in?

Expert:  david craig replied 1 year ago.


Customer: replied 1 year ago.
Nope, that's compressor engaged. Low, huh?
Expert:  david craig replied 1 year ago.

yes, that seems to be a bit low