Why does the air conditioner work in my 1998 Ford Explorer but not the heater. No heat comes out at all when heat is turned on.

Asked by May 31, 2015 at 08:31 PM about the 1998 Ford Explorer 4 Dr XL SUV

Question type: Maintenance & Repair

No heat whatsoever emits from vent when the heat is turned on but air conditioner works
fine. Please help me get answers.

7 Answers

7,245

Blend door actuator may have failed

455

That's a very good call Camaro collector, flush heater core / refill / and retest, also check heater control valve for opening and closing under hood on heater hoses passenger side close to firewall, make sure it switches when vacuum is applied

17,930

There is probably a vacuum canister somewhere, probably under the hood, which maintains vacuum when accelerating. There is usually a valve on it which can go bad resulting in the problem you are having.

7,245

Blend doors that year are electrically actuated

455

The heater control valve has a vacuum diaphragm to open water passage to the heater- core

455

They both fail!

4,995

Just for information; he wanted to know why A/C worked and not heat. It is like apples and oranges... two separate, individual systems and not connected except for the dash controls. You can't take 1/2 of an apple and orange and join them... doesn't work

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