Question about 1998 Ford Explorer

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Replaced leaking heater control valve - now blowing only cold air

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We closed the blend door by way of the glove box. Quick Fix amazing!!!

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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SOURCE: heater blowing cold air

squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.

Posted on Jan 04, 2009

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SOURCE: the rear a/c on my 1996 gmc suburban is blowing

the problem is in the rear expansion valve. this valve is located at the rear evaporator core. i am assuming the freon level has been checked and is ok. this is a common problem with these vehicles. hope this helps!!

Posted on Sep 04, 2009

  • 396 Answers

SOURCE: where is the heater control valve 2000 siverado

Most heater control valves are up next to the firewall behind the engine. Look for coolant hoses running to that area.

Posted on Oct 13, 2009

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SOURCE: heater blows cold air, replaced thermostat &

try to back flush the heater core. and if that dont work check the blend door it see if it is working.

Posted on Oct 15, 2009

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SOURCE: heater blows cold air. I have replaced thermostat,

Looks like the heater core is plugged stopped up. It is behind the dashboard.

Posted on Oct 26, 2009

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96 Mazda mpv thermostat replaced hoses hot to heater box no heat still.. not overheating. only blows cold air.. help???


sounds to me that you have a vacuum leak at your temp selector, or a leak somewhere preventing you from switching from hot to cold. Problem problem with your hot/cold selector valve, or if cable controlled, the cable may have slipped off the seclector valve.

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Heater blows cold air


make sure you have enough anti-freeze if you dont have enough it wont push through the motor to your heater core make sure the radiator is full and your resivor is full if its not that you need a new thermostat because your thermostat is stuck wide open these are cheap usually between 5-15 dollars and they are easy to replace just about any backyard mechanic can replace one sounds like you got a cheap easy fix be careful cause alot of shops and dealerships will over charge you this is a cheap part and only takes a few minutes to replace

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Engine heats up but takes a long time for warm air to blow. Once working, the thermostat works fine. Sometimes, warm air starts to blow and then goes cooler.


low fluid level or heater control valve may need replace..check hoses going to heater core...if cold...between heater control valve and heater core..replace control valve

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2003 Grand Prix not blowing hot air. Does the heater coil need to be replaced? If so where is it located?


If the heater coil was bad, it would be leaking radiator fluid... probably into your dash/floorboard (depending on where it is installed in your model car). There is a switch that diverts the hot radiator fluid through the heater coil when you want heat. There is also an air diverter valve that helps to mix the hot and cold air. The fluid valve is controlled by the A/C settings control. The one that you use to choose between heater/air conditioner/vent/ defrost. The air diverter is controlled by the temp mixing controller. The most simple explanation is that one of those valves or the controller of one of those valves is not working. If the hot water cant be diverted through the heater coil, the coil can't exchange the heat (warming the air). If the air diverter (hot/cold controller) cant move to add heat, then all you will feel is air from the vent side (from outside) or from the A/C cooling the air.

I would guess that its either a controller or one of the valves themselves. Odds are, it is a controller. That tends to be what malfunctions first.

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1997grand voyager is blowing cold air new thermostate water pump and the raditor and heater core has been back flushed it started blowing hot air again then went back to blowing cold air again


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I have a 1998 Dodge Dakota 5.2/ V8 4X4 and was told the Firestone service Rep that my water pump and thermastat were defective. I could smell coolant both outside and inside the truck. Also when the heater...


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Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


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Heater blowing cold air 1998 eddy bauer temp control blows cold air ,heater control was just replaced


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1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Thermostat Thermostat stuck closed grey_line.gif 3 Inspect Heater Control Valve Leaking or defective heater control valve. here something to help u

Here to help Shaun

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