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How do you bleed air out of the heater system On a 98 Pontiac Grand Prix 3.1 S.E.?
Wiki User
∙ 16y ago
Assuming you haven't got the tool to do it the easy way here's the hard way:
Park on level ground or slightly uphill.
Wait for engine to cool.
Locate the (one or two) two bleeder valve(s). Expect to find on thermostat housing and/or on pipe at top of water pump.
Open the one or two bleeders, as applicable. Note that if bleeder broken off pipe, you can disconnect the hose above it instead. If bleeder at thermostat housing broken off... oops?
Fill the radiator as much as possible. Expect bubbles to come out of the bleeders slowly and then you should be able to add a little more coolant.
Close the bleeders, then start the engine. Allow it to idle 5 to 10 minutes with the heat on. 5 minutes in hot weather, 10 in cold. Then, stop the engine.
Open one bleeder until a steady (not just spurting or bubbling) stream of coolant flows.
Close that bleeder then repeat with the other one.
Start the engine and run it at about 1500 to 1800 RPM for 1 minute.
Now, wait a minimum of 60 minutes in cold weather, 90 minutes in hot weather and repeat the whole process.
Wiki User
∙ 16y ago
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