Question about 1995 Isuzu Trooper

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95 trooper overheats but replaced thermostat,radiator,cap,hoses.

95 trooper w 176k.replaced thermostat, radiator, cap and hoses. Coolant goes to overflow tank, but won't return to radiator & car overheats . Used to have black gunk in overflow. that went away with new hoses. OK for short trips around town. no long traffic sits. NO lengthy road trips.
Thanks!

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  • rpdsdesign Jun 30, 2009

    how to fix?

  • rpdsdesign Jun 30, 2009

    also- is it possible that the new radiator cap is not permitting the return of coolant?

  • rpdsdesign Jul 01, 2009

    I'll try that, thanks.

    Dealer had tried to find source of gunk in overflow and did a head gasket check and said not that. They could not find the source of gunk(turned out to be disintegrating hose interiors-gunk gone now have new hoses). Radiator is new.maybe mismatch cap.Fan-will check tomorrow.

  • yadayada
    yadayada May 11, 2010

    sorry to say but u have a leaking head gasket.

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  • Isuzu Master
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Make sure ur fan clutch is puling some air and replace rad cap with new onr u may have to replace radiator long trips not getting enough water cooled

Posted on Jun 30, 2009

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CAUTION
If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.
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