why does my 2003 ford explorer v6 have no heat when left out in fidget temp but has heat when left in a heated garage?

Asked by kikki2424 Jan 02, 2017 at 07:47 AM about the 2003 Ford Explorer

Question type: Maintenance & Repair

2003 ford explorer V6 when left out in frigid weather has no heat
thermostat open, but when left in heated garage has plenty of heat. New:
rebuilt radiator, thermo housing/stat, new water pump and fly wheel
assembly, door blend actuator, motor, dash heating/cooling control system,
new coolant. When left outside in fidget weather, thermostat open has no
heat. but when left in a heated garage has plenty of heat?Ran out of things
to replace. Hoses are not hot, engine temp is low. Ran out of things to
replace. Can you help?

3 Answers
224,155

Rowefast answered 7 years ago

It is possible the Bypass Heater Valve or Heater Control Valve would need to be changed out, some have a vacuum line running to it. It should be located in the heater hose.

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