Having problems with your 1998 Ford Expedition ?
My 98 Expition blows hot but when its extremely cold wont blow hot air
You may want to check the codition of the anti freeze or add just antifreeze. try this first. if thats not it you may have a thermostat sticking open this may have to be replaced.
Repair Help & Product Troubleshooting for 1998 Ford Expedition
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