My heater isn't working the coolant level is good, the hoses are hot, and I just put a new thermostat switch in on the dash and it's still not working. What else can I try?

Asked by Nov 08, 2014 at 03:22 PM about the Ford F-250

Question type: Maintenance & Repair

I have a 2000 ford f 250 diesel. My
heater isn't working. The coolant is
full, the hoses are hot and I just put a
new thermostat switch in the dash.
What else can I try?

2 Answers

It could be the STAT stuck open and water cannot stay in the block long enough to get warm. As a test try putting some cardboard in fron of the radiator just to restrict air flow and see if things start warming up. Did one just this morning BOB LECH

112,075

Also check blend door in dash.

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