Question about 2001 Mercury Grand Marquis
Installed a new themastat, flushed heater core.seems like a/c compressor is on when calling for heat, still blowing cold air
Check the both heater hose from the heater core to the block. In one of the hoses you may find a valve either vacuum or electric. Try to check for air bubble. You could check this by taking loose the top radiator hose.
Posted on Nov 30, 2008
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Posted on Jan 02, 2017
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To troubleshoot this types of problem,click the link below
--------Go through the procedure to confirm the issue.
Engine Overheats and heater blowing cold?
Heat blows cold on drivers side and hot on passenger side?
This will help.Thanks.
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