Heater


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Posted by laszlo (71.199.100.162) on 10:10:06 11/13/11

99 sub, 7.4 engine. With the cooler weather, noticed the heaters were a little cool.

Checked the engine coolant temperature, was running around 174 F. Even after 20 miles or so.

Concluded that the thermostat was opening too soon, or more likely never fully closed. It likely was the original.

R&R thermostat. Now after 6 miles or so coolant at 193F.

Moral of the story, if low heat output from vents, check engine coolant temperature.




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