http://https://www.ford-trucks.com/f...l#post13678385Replaced t-stat, both ECT sensor and sending unit, flushed, 50/50 mix full, but heater still no heat. Gauge does not rise, and seems AC blows on all heater settings. Hoses all seem to warm up after a few miles, WP is pumping, has not overheated or boiled over. System was not terribly dirty,

Tired off swapping parts, have searched forums for clues, at a loss.
Here's the history
[URL="https://www.ford-trucks.com/forums/1276096-i-i-i-hot-ranger-i-i-i.html#post13678385"]


What gives? What am I missing?
Glad at least to have gotten the F150 fixed first! This lil red rangger has been reliable so far...orig clutch at 125,000 even.

 

If both heater hoses get hot, then you're probably looking at a broken temperature blend door, stuck in the "cold" position.

The A/C will run in all modes except OFF and VENT. That's how the system is designed.

 

Do you have an over flow bottle? If so, is there fluid in your overflow bottle? If no, when you fill the radiator, do you start engine and let it heat up? You'll know by watching the radiator fluid, it'll all of a sudden go extremely low. That's your termostat opening up. Once it opens up, re-fill the radiator and close. May want to turn on your heater during the process as well to get the fluid passing through your heater core as well.

No temp reading in the cab tells me the system isn't filled w/ fluid. No heat tells me there's not enough fluid to pass all the way through the heater core.

 

Could have trapped air in cooling system. With engine cold park on incline, remove overflow cap (assume no radiator cap), set temp on heater to high and run engine long enough to get fully warmed up (watch for air bubbles in overflow), top it off with fluid if level lowers and reinstall overflow cap.

 

...if it were so simple, to just burp it. System flushed and full of 50/50, correctly.

I'd be inclined to bet "blend door" in full A/C mode...but does not explain ggaugge.
Perhaps that inactive gauge is just a confounding factor, but i suspect that somehow it is related to the not hot heater.

Hoping someone ventures along who's encountered this condition.

link here has good troubleshooter, as well as procedure to repair WITHOUT pulling the dash> NO HEAT Troubleshooting Guide - Ford Ranger ForumNO HEAT Troubleshooting Guide - Ford Ranger Forum

 

It's always been that simple for me. Have had to do it on MANY vehicles including work vehicles where the heater didn't work at all during the winter. Boss didn't want to "fix" the van because it was old and he was going to be replacing them anyways. I added H20 and guess what... IT WORKED GREAT!!!

If that's NOT your problem, that's not your problem... it's all good... hope you find the solution soon.