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no heat and rising temp are simply a product of the coolant leaking (low). Most likely cause of leak (assuming all heater hoses have already been checked for leaks is the intake manifold gaskets. GM used solid PLASTIC gaskets on these motors with o-ring type seals around the ports and over time develop leaks between the cylinder head and intake manifold. A gasket set by Felpro is now made w/ steel inserts/molded rubber seals to rectify the problem. requires removal of intake manifold. I have done several of these with the same problem.

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Q: 93 Chevy Astro waterpumpwas replaced a few months ago today its leaking again at the back of engine no heat and temp rising what is wrong now?
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