Heater only blowing cold air.

Asked by Jan 18, 2016 at 06:45 PM about the 1998 Ford Expedition 4 Dr XLT SUV

Question type: Maintenance & Repair

One heater hose is hot & one is really cold. The
heater will only blow cold air. What do i need to do
to fix it?

12 Answers


sounds like you have a plugged heater core, you can try to flush it out if that don't work then it will have to be replaced, and is very expensive because the dash has to come out

2 of 2 people found this helpful.


3 of 3 people found this helpful.

You mean like if there was work done to the cooling system to make sure and purge the air pockets out when refilling?

2 of 2 people found this helpful.

Check your heater valve,may be bad or vacume to it.

3 of 3 people found this helpful.

Sounds like plugged heater core. Inlet is good but it's to clogged up for fluid to travel through it. I've used vinegar and air compressor to blow it out through both hoses

1 of 1 people found this helpful.

you wont find that valve anywhere nere a ford Expedition


they use a blend door to control the heat setting not a coolant control valve, If on hose is hot and one cold you have a restriction inside the heater core, I have had luck with CLR you can buy this at a hardware store


Say there Steve B. the parts book does call out one like this. I know somewhere around this year they stopped using this.


The heater hose valve like T_S_T picture.


The 97 to 02 has a blend door system with reg heating, if your expedition has Aux rear heat you will have a control valve for the rear heat, so my thinking there should be flow through the front heater core at all times. Is very hard to diagnose cars/trucks without seeing them, but I try to give the best advise I can. with the information a have

2 of 2 people found this helpful.

I have a 99 does expedition. It blows out cold a.c. but it dont blow out heat. It has third row seating and none of the vents have heat but have air. What could it be?

3 of 3 people found this helpful.

I know this is an old post but I have the same problem, however the heater core is new so that is not the problem. And suggestions?

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