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Getting no defrost one line ti heater core hot other line cold

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Sounds like you have a bad actuator or a clogged heater core.

Posted on Dec 18, 2016

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Posted on Jan 02, 2017

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Blows cold air turn heat on


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    repairpal.com > Problems > Buick > LeSabre
    ... Cadillac, Chevrolet, Chrysler, Dodge, FIAT, Ford, Geo, GMC, Honda, Hummer,Hyundai, Infiniti, Isuzu, Jaguar ... I'll turn up the temp on the dual control to get heat,

Jan 28, 2016 | 2005 Hyundai Tucson

1 Answer

I have a 2000 jeep wrangler when I turn on the heat or defrost I can hear it running but I get no heat. What could cause this heater coil, thermastat or something else maybe?


Is coolant level full? To check if the heater core is circulating coolant, feel both heater hoses where they enter the firewall-both should be hot when car is at normal operating temperature. If only one is hot, look for a heater valve in the heater line-make sure it is open so the heater core circulates. Not all vehicles have such a valve, in fact, I think most don't have the valve, but you could check. The valve may be cable operated or vacuum operated to open and close. If no valve, and one hose is cold, there may be an air block in the heater core. Crack a line loose to get coolant circulating.
If both hoses are hot, it is probably the doors in the heater case not operating properly. Watch the door actuators when you move heat from cold to hot, and when moving from defrost to another setting. The temperature blend door is probably on the passenger side of heater case. These doors may be cable operated, vacuum operated, or electrical motor operated. If you watch for their operation, you might see or hear the problem with them not opening or closing properly.
Good luck.
If both heater hoses are hot

Jan 01, 2013 | Cars & Trucks

3 Answers

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

2 Answers

My 2003 dodge caravan only blows cold air when heat and defrost are on. The coolant is full and the pin for the engine is half between hot and cold. How do i get my heat and defrost back?


Please see my tip at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . These are genericinstructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
Your blend door actuator is on front of the heater box by the core. Check to see if it is actuating when you change the temp setting. Take it off to see if you can open/close the door by hand. Let me know what you discover for additional help.
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May 07, 2011 | 2003 Dodge Caravan

1 Answer

Heater blows cold air, also defrost blows cold


check to see if your hoses to heater core are hot on both sides. my 93 hoses where hot going in the heater core but not out. I flushed the heater core now I have heat

Dec 12, 2010 | 1993 Cadillac DeVille

2 Answers

Changed the thermostat, still no heat. Is there a valve of some sort in the heater hose lines or on the heater assembly that controls the hot water?


when the vehicle is cold take the radiator cap off and start the vehicle let it run with it on defrost at full blast until the vehicle gets to running temp,if there is still air in the system it will blow cold air if that doesn't work then check to see if the vacuum lines that run the blend door in the heater box have came off (depending on year)

Dec 28, 2009 | GMC Jimmy Cars & Trucks

1 Answer

Heater blows cold air


Try changing the thermostat,and also touch the heater hoses going in and out of the heater core.They should be the same ,hot. You could try back flushing the heater core and then run water the opposite way.Your ac line will have some moisture on them because when the heater is on defrost the compressor for the ac comes on. Hope this is helpfull.

Nov 23, 2009 | Ford Taurus Cars & Trucks

1 Answer

Changed the blower motor in 1985 wagoneer still dont get any heat, the heater core is still good, what else could it be??


What does the temp gauge read? 180-190 is ok if not change the thermostat,if ok is heater core lines both hot? if yes then heater core is good if not and one is cooler then core is plugged flush it out,if all that is good the air handler door are vaccum operated if there is no vaccum then all air in stuck on defrost and if not this then the hot air is getting cooled by cold air either from a broken heater box or the heater control for hot and cold is bad.

Mar 09, 2009 | 1985 Jeep Grand Wagoneer

1 Answer

1994 Taurus heat control problem


First check to see if the water to the heater core is hot. if not then you need ti check the hot cold vale . it is an electric valve that opens to let the hot water bvy.

Dec 05, 2008 | 1994 Ford Taurus

4 Answers

Heater doesn't work in car


i have a ford fiesta 51 plate,when i turn on heater i only have cold air the thermostat has been fixed and coolant levels are ok heatin hoses are all hot,but inside the car its still blowing cold

Oct 19, 2008 | 2005 Chevrolet Malibu

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