1999 Ford Expedition Heater

Tiny
WOODS09
  • MEMBER
  • 1999 FORD EXPEDITION
Heater problem
1999 Ford Expedition 4 cyl Four Wheel Drive Automatic

My husband just put in a new heater core and blender door, and he changed all of the fluids but the heater still will not wok. Any ideas?
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Monday, March 1st, 2010 AT 3:20 PM

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Tiny
SERVICE WRITER
  • EXPERT
When you turn it on, does it blow air? Just cold? No air?

If you feel air:

Feel the heater hoses after it has come to temperaure.
Are they both hot or one colder?
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Monday, March 1st, 2010 AT 7:51 PM
Tiny
WOODS09
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The hose is cold
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Tuesday, March 2nd, 2010 AT 12:13 AM
Tiny
SERVICE WRITER
  • EXPERT
Okay, either there is no coolant (air pocket, flow problem) going thru the core, or it is not coming to temperature (thermostat).

IS the coolant level remaining the same? You are not having to add any?
IF the coolant was crudy to start with, there may be a restriction. I have seen cores plug right back up, but not immediately like in this case.

Sometimes you can try jacking the front of the vehicle WAY up to help bleed our an air pocket.
Fords can be tougher to bleed out. There is a tool that works well called an Air-Lift vacuum unit to remove air also.

IF the thermostat is stuck open it can take an exceptionally long time to warm up.
http://www.2carpros.com/dia/test_thermostat.htm

On very rare occasions I have seen water pump fins eroded and no longer able to push the coolant.
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Tuesday, March 2nd, 2010 AT 4:38 AM

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