My heater is only blowing luke warm air
during the day it has blowing hot air
when i fired it up to go this evening it was blowing hot then it change to luke warm

It wont get any hotter the temp gage says 3/4 hot towards the high part of normal

1980 ford f150

Im lost



Gerald

 

There is a cable that controls the hot/cold door. (the slider with hot on one side and cold on the other) Make sure that cable didnt' come undone at either end. My 86 was stuck on hot all the time. No fun in the summer! I traced the cable. It has mounts that hold it in place every hear and there under the dash, holding it to various bracing to hold the cable secure. one clip had come off, so whenever I moved the lever, it put slack in the cable rather than forcing the cable to move the door to the cold position.

 

My truck ran 3/4 over on the guage and I didn't have any heat either. This happened about 4 years ago when it was very cold. A few more miles down the road and it boiled over. I didn't have enough anti-freeze in the radiator and ice blocked the flow in the radiator, making it overheat.