heater working on n off...any ideas

[TexasAngel34]

When i turn the heater on it works warm for a few then starts blowing cooler... just started doing this, with cold weather here , any ideas suggestions what i need to check....

 

[flyin]

Plugged heater core?
When the heat is blowing cool feel the heater lines. Both should be very hot if the heater is ok. If one is hot and the other lukewarm to cool then you have a blockage in the core. Check your coolant level first and be sure it is full when checking.

 

[TexasAngel34]

Ok ty, i will check that tomorrow

 

[toms89]

When i turn the heater on it works warm for a few then starts blowing cooler... just started doing this, with cold weather here , any ideas suggestions what i need to check....

Blend door issues are also common in the 1st generation expys. Do a search on this site...