Question about 1990 Isuzu Trooper

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1990 bmw 525i overheating ..

Replaced t-stat..chkd and water pump is pumping seems to be circulating but no heat to cabin..wondering if their is a secondary pump for heater core not allowing to make full circulation..?

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  • Anonymous Dec 27, 2008

    on my 525 i bmw 
    water hose had hole in it and now taped it up and have the same problem, what should i do, I have turne off the temp. inside to off position and stopped  what i think is a secondary pummp which was malfuctioning

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No such pump! Make sure you have anti-freeze in the radiator. It circulates better than just water, because water boils and turns to steam (goes UP) proper antifreeze helps it not have pockets of steam/air.

Posted on Dec 22, 2008

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