Question about 1990 Chevrolet Cavalier

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A/c promblem the a/c clutch quits after running for 10 min blows cold air but after the 10 min the clutch trys too start but won't

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  • bob drumheller Jun 18, 2008

    it was converted to r-134a where is the line filter

  • bob drumheller Jun 18, 2008

    the a/c blows cold for 10 then quits

  • brian c
    brian c May 11, 2010

    It's really hard to say exactly where it is, as they move them around year by year. It may be at or near the evaporator by the firewall, or up front near the condenser.

    It will be at a coupling on one of the hard (aluminum) lines. You will see a "bulge"or slightly wider area of the tube about 3" long down the line from the coupling, and then the line will be its normal size.

    Once you have located it, you can GENTLY pull the valve out of the tube with a pair of needle nose pliers. You will most likely see aluminum "shavings" in the screen.

    Replace the filter / valve (they are under $10 from most auto parts stores). Don't try to clean it.

    When refilling the R134a (after using the vacuum), it is critical not to over fill it. It's not like the R12, where more freon makes it colder.




  • brian c
    brian c May 11, 2010

    It's either of two things:

    One, the pressure is dropping, and not allowing the system to engage the clutch. It may just be slightly low on refrigerant (this can be expensive is it has not been converted to R-134A yet, and still has the old R12 in it)

    Two, the pressure is getting too high, which also tells the system not to engage the clutch. This can be caused by a clogged a/c line filter, called an orifice tube.

    When was the last time the a/c system was serviced?


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The system can get quite complicated with pressures, leaks and switches. Unless you are prepaired to buy tools, supplies and parts you should leave it to a capable shop the system should be recovered and properly recharged if changing seals, filters, "o"rings and refrigerant.
Although a switch or clutch components can be changed without draining the system. which could be your case, clutch coil and clutch may be defective or a switch could be defective. jumping switches and or compressor along with testing currents will identify a problem witch a shop can perform. Or you can after buying a service manual and studying it indepthly. Go to www.acsource.net and start your research.

Posted on Jun 30, 2008

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  • Master
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No, i think you ahould check the thermostat and replae it.

Posted on Jun 25, 2008

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