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?

10 Answers

1,445

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 out of 2 people think this is helpful.
19,705

NO>>>>CHECK FOR A VACUUM LEAK>>>>>>>>>PLEASE

3 out of 3 people think this is helpful.
42,485

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

2 out of 2 people think this is helpful.
60,015

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

1 out of 1 people think this is helpful.
190

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 out of 1 people think this is helpful.
1,445

you wont find that valve anywhere nere a ford Expedition

1,445

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

42,485

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

42,485

The heater hose valve like T_S_T picture.

1,445

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 out of 2 people think this is helpful.

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