1994 Ford Aerostar Heater and thermostat out

Tiny
ROBINC39
  • MEMBER
  • 1994 FORD AEROSTAR
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 155,000 MILES
I would like to know if the thermostat goes out would it cause the heater to quit working? They both decided to quit working at the same time.
Wednesday, January 16th, 2008 AT 6:49 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

If the thermostat fails to open the circulation of the coolant is near zero and such will be the circulation through the heater core. The engine will boil in the block but the heater will be cool due to no circulation. A thermostat stuck fully open will give the engine maximum circulation, the engine will take a longer time to come up to temp and the heater will fell inefficient. If in doubt change the thermostat.

Mark (mhpautos)
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Wednesday, January 16th, 2008 AT 7:27 AM

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