Heater not blowing hot air

Tiny
YAW2K11
  • MEMBER
  • 2000 MITSUBISHI ECLIPSE
  • 190,000 MILES
Recently changed the radiator (found a radiator out of an Galant that fit). Now the heater isn't blowing hot air. 2.4 L 4-cyl 5 sp manual
Saturday, February 4th, 2012 AT 8:37 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Most commonly there is an air pocket in the cooling system. First be sure the engine isn't overheating due to lack of coolant flow. Air pockets like to develop right under the thermostat, and thermostats don't open in response to hot air. They have to be hit with hot liquid. Look for a bleeder screw, threaded plug, or temperature sensor on or near the thermostat housing that can be removed to burp the air out of the system.

Once that is done, the top radiator hose should be hot indicating coolant is circulating. At that point, feel the heater hoses. They should be too hot to hold onto for very long.
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Saturday, February 4th, 2012 AT 8:42 PM

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