Did you replace the thermostat and also check for a heater control valve that's malfunctioning

Answered by rasmataz
68 questions asked

yep i did, can't find any valves that are malfunctioning, they all seem to open and close right.

thanks

Response from AKTYREMAN
1 question asked

Is there a valve attached to the heater hose before it enters the heater core

Answered by rasmataz
68 questions asked

nope just straight in, its hot going in and out of the heater core

Response from AKTYREMAN
1 question asked

Did anybody figure this one out? I am having the exact same problem with a 97 F 250. Thanks in advance.

Answered by MTWS 525
0 questions asked

I had same problem. Replaced thermostat and heater core. Here's all it was......... an ink pen.
Take the glove box door off to see the blend door cable. Make sure it appears to be working. Then remove the heater core cover and blend door cable.( I had to loosen up the dash to get the cover out.) Now look inside the plenum and manually move the blend control door from hot to cold. If it doesn't go completely to the left closing off the plenum then you may have a pen or something out of view on the floor of the plenum. Take a wire or hook shape tool and rake it along the bottom next to the door and listen for anything loose.I was able to squeeze my hand in enough to remove it. Check door again and it should go completely closed.

Answered by verycold
1 question asked