2000 F350 heater not working when in over drive

Asked by Jan 05, 2017 at 10:34 AM about the 2000 Ford F-350 Super Duty

Question type: Maintenance & Repair

Have replaced heater hose and thermostat. Heater
works fine when not in overdrive but no heat when I
shift into over drive

5 Answers

85,515

Coolant may be low or might be air in the cooling system. Was the air burped out after refilling? Was the heater set on hot when burping the system?

Not sure how to burp system. How do I do that?

85,515

With the radiator cap off, let the vehicle run so the thermostat opens. It may push fluid out the radiator but that is ok, that would be the air working its-way out. Have extra coolant to be able to pore back in once the level drops in the radiator. Do not rev up the engine or you will get a shower with the cap off. Have the heater temp set on high. Let the thermostat cycle a few times you can tell by watch the level in the radiator and by feeling the top radiator hose. It gets hot when the thermostat opens. Having the front end of the vehicle elevated helps.

1 people found this helpful.

Thanks - we'll give that a try and see if it solves the problem

85,515

Sounds good.

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