Question about 1993 Volvo 850

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1993 Volvo 850 AC blows cold for a few, then goes hot

My AC has been recharged and checked again. Charge is good. Sometimes we will be going down the road and it suddenly starts blowing hot. Sometimes it will start going cold again. When its cold, its really cold. Couldn't see any freezing of lines around firewall to compressor.

Any ideas?

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  • rhshealy Jun 29, 2009

    I just had the charge checked, so it's not the charge (or else it was checked wrong for the 2nd time). I'm wondering if an AC relay may be going out?

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It might be low on charge

Posted on Jun 28, 2009

  • Ronado Panaligan
    Ronado Panaligan Jun 29, 2009

    Yeah a malfuctioning relay could be a problem too. You can rig up another relay in series with the power to the compressors clutch. You take the a twelve volt Connect that to the contact, and then you use the hot wire from the wire that is suppose to drive the clutch solenoid to drive the coil on the new relay. What this does is take a lot of load of the relay that was going bad. If it solved the problem it is actually a permanent fix. because the other relay that was going bad would last forever. If the problem persist it is not the relay then. You try a load check on the clutch solenoid to see if its drawing too much current.

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