Question about Pontiac Grand Am
No coolant getting to heater core,has to much air in system, causing to over heat
Change thirmostat and refillcooling system look for bleed niples on the heater hose's and coolent pipes and on th top of radiator if it has an expantion bottle then remove and hold up higher than the cooling system and fill that way
Posted on Dec 30, 2013
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Posted on Jan 02, 2017
SOURCE: 1999 Ford Windstar 3.8 no heat
If you have a knock or clicking noise behind the radio, it is the blend motor. The blend door is spring loaded and the gears in the blend motor are "stripped". The door is spring loaded so that the door is closed to the heater core. About 2 hours to replace and a lot of bending and stretching. You don't have to remove the dash, but all of the trim, radio, and controls will need to come out.
Posted on Mar 01, 2009
You can bypass the core or fix it that's up to you but I would change or remove the thermostat first. If it still overheats then start looking at the water pump and radiator. Hope this helps. Good luck.
Posted on Jun 09, 2009
Put your heater temperature control in the max position on(this opens the valve for coolant flow through the heater core). Top off the radiator and the coolant resevoir. Make sure the cap is on tight and bring the engine up to operating temperature. Shut off engine, allow to cool, and top off the radiator again. Repeat these steps until you are sure it will not take anymore coolant. Drive the car at speed for 5 or 10 miles and recheck again when cool. It takes awhile to work air out of the system with multiple openings of the thermostat.
Posted on Jan 04, 2010
SOURCE: plenty of air but no heat
Check to see that the blend door linkage is hooked up. Doubtful it is heater core, as you had heat to one side and not the other. Check coolant control valve linkage, verify it is moving the coolant valve from off to on when you switch temperature from cold to hot. Verify you have coolant flow to the heater core by feeling the heater hoses where they enter the firewall. If all checks out well, then look at hvac controls individually.
Posted on Jan 06, 2010
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