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#1
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a/c question
Yesterday I had a guy tell me he could fix my a/c problem: compressor shutting of after a few minutes. He said it would need the expansion valve flush. I have the '87 300TDT and freon level or belt slipping are not the usual suspects.
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#2
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Does the a/c operate normally for 5-10 minutes, then the compressor disengage and not come back on for an extended period?
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#3
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Correct.
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#4
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Then I would suspect the evaporator temp regulator. It is supposed to disengage the compressor to prevent evaporator freeze-up, but it can fail so that it "trips" at a too-high temp. You could unplug it and jumper the plug and see if that solves your problem.
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#5
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Could also be a temperamental Klima relay or low pressure switch.
Sixto 87 300D |
#6
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No easy way out, as always....
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#7
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Today I broke down and bought a new KLIMA relay- you were right on with the guess regarding a "temperamental" relay! Just a side observation: after I had a new unit in and a/c blowing cold air, I decided to take a look at the old one. It looked like it may have a darker spot on the board: how could it have happen with just 12v passing through?
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#8
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Don't DO This !
12Volts D.C. ain't anything like A.C...12 volts D.C. will stop your heart!
12 volts D.C. is enough power to weld a wrench dropped so that it contacts both poles... 12 volts D.C. will turn the tip of a glow plug so cherry red that you can brand cattle with it for about 5 minutes (AFTER it's disconnected). Think about it this way: Alternating Current switches Polarity back and forth. Direct Current is just straight power...
__________________
'84 300SD sold 124.128 |
#9
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Thanks to "compress ignite" another lesson learned! Hopefully you'll be around for many more of my "how come...." posts. Appreciate the straight up help.
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