Question about 2001 Mercury Grand Marquis

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Cold air out of heater

Installed a new themastat, flushed heater core.seems like a/c compressor is on when calling for heat, still blowing cold air

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  • Anonymous Jan 30, 2009

    I have no heat and my windows fog up whenever i turn the defroster on

  • Anonymous Feb 21, 2009

    still the heat is not coming.it is only the ac is coming

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  • 9 Answers

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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1 Answer

Blows cold air no heat.installed new thermostat and heater cole.hoses feel hot on one cold on other.


Could be the water pump. When it heats up the impeller can spin on the shaft. Not enough pressure to push it the the heater core. Make sure you purge all the air out first. Cores are bad for holding air. Some cars worse than others.

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Everything seems to work??? still no heat?


dirty heater coil, clean it out so the hot air will travel thru

Dec 18, 2013 | Cars & Trucks

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Heater blows cold


To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.------
Engine Overheats and heater blowing cold? http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
-----------
This will help.Thanks.

Feb 15, 2012 | 2003 Buick LeSabre

1 Answer

Heater core is working properly but car will not blow hot air only cold air i am thinking the flapper that controls hot \ cold is stuck in the cold air position


To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

------
Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------
Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

-----------


This will help.Thanks.

Jan 25, 2012 | 2001 Buick LeSabre

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I have a 2000 Chevy Silverado pickup, and the heater will not blow hot air. I replaced the thermostat, and nothing changed. The radiator was flushed and filled in the last two months as well. I have all...


once truck is warm check both heater core hoses to make sure they are both warm if not then check the cold water valve could be stuck shut not allowing coolant to travel in to heater core.

Jan 05, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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1 Answer

Heater blowing cold air with coolant, fine with plain water


it sounds like the heater core is clogged bad if u know someone with a air compressor put a air nossel on it that you pull the trigger to blos air in to the heater core after you take the lines off i had to do this before on a jeep cherokee it did the job

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1 Answer

1992 Jeep Wrangler heater not blowing hot air


How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

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