Heater blows cold air when it's sitting idol, but begins to blow hot air when in motion. Any insight on why?

Asked by Sep 03, 2014 at 08:41 AM about the 2004 Ford F-350 Super Duty

Question type: Maintenance & Repair

2 Answers

33,405

I hope that it's only air in the system. But with 6.0 diesel, how it got there could be unpleasant.

1 out of 1 people think this is helpful.
90,705

Yep a low charge or a high pressure problem in the A/C system will do that.

1 out of 1 people think this is helpful.

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