Question about 1994 Isuzu Pickup

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Engine running hot

Why does my truck immediately begin to run hot when i turn on the air conditioner?

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Possibly fan clutch or clogged radiator/condensor.
To check for fan clutch, hook up A/C gauges, turn a/c on watch high side gauge. 300 psi. and above run water on condensor, if psi. goes down to about 250 psi and holds. replace fan clutch.
If not, check radiator/condensor for dibris outside, and or corrosion inside the radiator.

Posted on Jul 18, 2008

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