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When the truck is in motion the heater works fine but when idleing it blows cool air instead. What could be the cause of this problem?

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  • Cars & Trucks Master
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Water pump worn !

Posted on Dec 19, 2016

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6ya6ya
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Posted on Jan 02, 2017

Brian032472
  • 150 Answers

SOURCE: Frequently loss the coolant and

You are losing coolant if you have a coolant pressure tester follow the directions and use it. If you don't when the car is cool use a 50/50 solutuion of water and coolant fill system and check all the listed items carefully with a flash light and look for leaks. It is either a bad hose, cap, water pump or radiator. Your coolant circulates through the dash and the blower blows throught the heater core to produce heat. No coolant no heat. I would also check the passanger side floor for anti freeze or moisture could be a leaking heater core also.

Posted on Nov 02, 2008

SOURCE: Heater in 2005 Focus

Is the interior blower working? I also had this problem, if your blower isnt working check resistors for blower speed then the blower itself

Posted on Feb 08, 2009

  • 3 Answers

SOURCE: blowing cold air

I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

Posted on Feb 27, 2009

johncaman
  • 201 Answers

SOURCE: 02 Mitsubishi Eclipse heater gets hot only when in motion

Does your engine temperature guage read normal? Have you checked your coolant level? This can be the result of a partially seized thermostat... there is also a valve in the heater core lines that can seize partially closed. As the engine speed increases, the water pump can force more water through the partially closed component.

Posted on Mar 04, 2009

  • 161 Answers

SOURCE: Heater blows cool air instead of warm air

check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.

Posted on Dec 07, 2009

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1 Answer

Heater blows cold air


This is from Lifewire: If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Another common problem is when air gets into the cooling system. Since the heater core is often the high point in a cooling system, air can move into it and become trapped.

Try this site too: https://axleaddict.com/auto-repair/Why-Are-My-Car-Heaters-Blowing-Out-Cold-Air

Apr 18, 2017 | Cars & Trucks

2 Answers

Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


heater blows cold air idle chrysler 300 Questions & Answers ...

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Find solutions to your heater blows cold air idle chrysler 300 question. ... blow warmair for a few mins then back to luke warm. i replaced thermostat ... HEAT BLOWSCOLD AIR WHEN IDLING ONLY GETS HOT WHEN START DRIVING ... About 15 minutes after driving the diver side vents start blowing straight cold air but the ...

Heater only works when pressing the gas? - DoItYourself.com ...

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Nov 3, 2011 - When I press the gas, the air from the vents is nice and hot. .... So am Idriving a car with a ton of problems, or could the power steering ... Just anotherquestion, when warmed up does the engine temperature ... When the heater is on and I'm not pressing the gas pedal, luke warm air blows from the vents.

Heater blows cool air when stopped and warm air while ...

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RedditFeb 12, 2014 - Heater blows cool air when stopped and warm air while driving 2008 Kia Spectra (self. ... just fine but appears to blow cool air when I was stopped at a stoplight. ... My temp gauge would also be pegged high when at idle / low RPM. ...thermostat only blocks coolant going to the radiator, and the heater core, ...Missing: 300m ‎luke

Why is My Car AC Blowing Hot Air? - BlueDevil Products

gobdp.com/blog/car-ac-blowing-hot-air/

Jan 27, 2016 | 2000 Chrysler 300M

2 Answers

Why does the heater blow hot air when I drive after its been idling for 15min and not during the idle when it reaches the 100 Temp?...(it blows cold air in idle)


Firstly, a thermostat that opens quicker will not give you better heat. Your heater core may be partially plugged causing a low flow issue. Another area to check would be the water pump impeller for corrosion or slipping on the shaft. Does the vehicle's cooling system operate well otherwise?

Jan 27, 2015 | 2002 Pontiac Grand Am

1 Answer

Why does a/c only blow whil vehicle is in motion?


you have a problem with the heater/a/c controls there obviouly stuck on a/c you will need to strip out the control panel to see why the direction/vent , hot/cold , fan speed controls are not working , before doing this have you checked the fuses as there may be a seperate fuse for the control panel ,if this all checks out take to an a/c specialist as you dont want to mess around with a/c gasses etc

Apr 30, 2014 | 2005 GMC Sierra

1 Answer

Heater not blowing hot


My 2006 f-150 4.2L 113,000 miles heater blows cool when at Idle ,But when driving the heater blows hot. Change thermostat change water pump change the Rad. change the blend door motor
flush the block bleed the system add new green coolant. After all that still blowing cool air at Idle. What is causing this problem.

Jan 03, 2014 | Mini Cooper Cars & Trucks

2 Answers

When the car is idling, the heater blows out cool air but when the car is moving, the heater works fine


When the coolant in the heater core is hot from the engine and your fan is on hot air will blow through the hot fan coil, i figured it out, when i stepped on the gas i could here the coolant squeezing by the control or limiter valve, because the higher rpms make the belt spin faster which makes the water pump pump harder causing more pressure, so when u idle that hot coolant will cool down from the fan blowing on it, u need to find the control valve and open it up to full blast, then hot coolant will always be flowing through your heater coil. ;)

Dec 17, 2010 | 2008 Pontiac G6

1 Answer

Heater blow cool air at idle


try flushing the cooling system. sounds like the heater core may be all gumed up inside. could also be the water pump starting to fail.

Feb 05, 2010 | 2002 Nissan Maxima

1 Answer

Heater blows cool air instead of warm air


check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.

Dec 07, 2009 | Dodge Grand Caravan Cars & Trucks

1 Answer

02 Mitsubishi Eclipse heater gets hot only when in motion


Does your engine temperature guage read normal? Have you checked your coolant level? This can be the result of a partially seized thermostat... there is also a valve in the heater core lines that can seize partially closed. As the engine speed increases, the water pump can force more water through the partially closed component.

Mar 04, 2009 | 2002 Mitsubishi Eclipse

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