I would suspect the thermostat failed stuck open. Is your coolant topped off and nothing leaking?
Possible air in the cooling system. Is the engine temperature gauge at the normal level? You may also want to flush the cooling system in case the heater core is plugged up.
2005 super duty, heater is set at 90 degrees, blows air but is not hot
2005 Ford F-250 Super Duty Lariat Crew Cab 4WD
-
Maintenance & Repair
Heater will only work on defrost,won’t change to floor or vent. Would it be switch,vacuum,or panel/floor control motor. How do I check that.
2000 Ford F-250 Super Duty XLT 4WD Crew Cab SB
-
Maintenance & Repair
My heater will switch back and forth from hot to cold air. What could be the problem?
2013 Ford F-250 Super Duty Lariat SuperCab 4WD
-
Maintenance & Repair
Hello I have 2002 f250 7.3 diesel has no heat blows only one speed and through defrost but cold would this be vacuum leak or heater exhange motor thank you in advance
2002 Ford F-250 Super Duty Lariat 4WD Crew Cab LB
-
Maintenance & Repair
The A/C,Heater blower in my 1999 F-250 Super Duty stopped working , I put in a new relay , and changed all three control switches, ( fan, thermostate, and vent controls) . Double checked fuses, all g...
1999 Ford F-250 Super Duty
-
Maintenance & Repair
Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.