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No heat 97 F250 HD, gas

Old 10-14-2015, 01:22 PM
Thread Starter
Join Date: Oct 2015
Posts: 1
Default No heat 97 F250 HD, gas

I have been trying to track a lack of heat in my 1997 F250HD with the 7.5 L gas engine. I have replaced the thermostat and get "normal" heat readings. Both hoses to the heater core are hot. I looked at the end of the cable attached the heater dial and the external components move. There is a vacuum actuated valve in the engine compartment. It activates when I start the vehicle.

Any ideas? Thanks. And I did search the forum, but might not have used the right key words.
Old 04-27-2019, 06:18 AM
Join Date: Jan 2019
Location: vermont
Posts: 3

is the heater core clogged?...I believe on those trucks the heater core is located behind the glove box....also make sure your antifreeze levels are good. My 97 f350 diesel was running a little hot and I was getting no turned out to be about 3 gallons low on antifreeze.... now the truck is cool and the heat is working again...where the antifreeze went is my bigger problem..hahah
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