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How do you properly refill the radiator coolant after replacement of the heater core on a 91 Grand AM coup LE 2.5L Tech 4?
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∙ 14y ago
How do you properly refill the radiator coolant after replacement fo the heater core on a 91 grand AM coup LE 2.5L Tech 4? Your coolant reservoir or overflow container is how you fill the radiator. The radiator itself doesn't have a cap. Your reservoir overflow plastic container has a pressure release cap on it which releases pressure. Do not ever open hot. It also should have a little electrical plug in the bottom which lets you know on your dash when coolant level is low. There is a full cold line on reservoir tank showing where it should be when engine is cold. Whenever coolant is drained on Grand Prix's, or Grand Ams they are notorious for getting air pockets and not circulating properly. I always go ahead and change thermostat also or have it changed if draining and flushing as pieces of dirt and grime could get stuck in pin of thermostat when flushing. On these you are better off letting a mechanic flush & fill in my opinion, as they no the little tricks on how to burp [remove the air pocket]. Whenever a engine is replaced or headgasket replaced the engine usually needs to be burped, which I believe is done by removing the little square heade bolt at thermostat housing and allowing the air pockets to escape. I would talk to your mechanic on this precedure though as I said Pontiacs are notorious for getting air in the coolant system.
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∙ 14y ago
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