Question about 2005 Pontiac Grand Prix
Bleeding air out of the system will purge also air out of heater core. Sometimes you may need to add a "flushing tee" (available from an autoparts store) to get some trapped air out of system.
If the air is not removed, if an air pocket is in the heater, you get no heat because coolant cannot move through at an adequate rate to be useful. In other areas it can cause hot spots in the engie that lead to cracked heads, blown head gaskets, or an engine that does not run well.
Posted on Feb 12, 2012
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Posted on Jan 02, 2017
SOURCE: i want to flush the heater core
Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem
Posted on Dec 24, 2008
Are you sure you got all the air out of the cooling system? Air pockets are very common problem when you do any work to the cooling system. An air pocket will do what you discribe.
Posted on Mar 18, 2009
you are going to need a manual with a diagram.because you going have to remove parts under the hood.you going have to remove floor console.and lower instrument panel insulator. on both sides.
Posted on Jul 15, 2009
The thermostat had failed to the open position. This engine had the resilient seal with an interior grove instead of a flat gasket. The seal fits around the thermostat flange with the flange seated in the groove. The thermostat/seal drop into the well machined in the block. The top of the seal apparently should protrude above the surface of the block so the thermostat housing will squeeze the seal as the housing is tightened in place.
Here's a potential problem that I found. I bought a Murray 7203-192 failsafe thermostat and 2273 seal from O'Reilly. When I assembled the seal on the thermostat and dropped it in the block the seal did not protrude above the block. I'm going to shop for a taller seal before I finish the installation.
Posted on Jan 06, 2010
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