Question about 2000 Oldsmobile Bravada

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2000 olds bravada the heat dose not get hot or cold stay the same i switch it to hot or cold dose not matter what could it be

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Hello the bravada and the s10 blazer are bad about the heater cores air locking or either stopping up. Disconnect the heater hoses at the firewall and run a water hose to the inlet then try the outlet until the water is clear of debris then reconnect and refill with coolant remember 50/50 coolant water. Pure coolant will freeze and so will pure water. Thank you

Posted on Feb 22, 2009

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The bravada heater will not heat up. it is blowing out cold air. both lines that go into the firewall are getting hot when heater is off.


The good news is that the heater valve is open and the hoses are hot. The bad news is that the heater core is clogged. If it is not even warm, it needs to be replaced. If it does get at least a little warm that means it is partially clogged and could be flushed out.

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Did you run engine from cold, with heater on when you refilled the system? Try again, rad cap off, with heater on, and let engine get up to operating temperature, make sure you have good flow through rad ,leave cap off, until rad fan comes on to cool returning coolant to rad at least twice. Give engine a little extra rev, for 5 seconds or so, every once in a while to make sure flow getting through heater core, and add coolant as necessary. See if that helps, as it may just be an airlock in system. If your cooling system has any bleed screws incorporated, crack them once in a while as well.

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