06 f150 heat issue...update

After exhausting all possibilities I took my truck to a shop It turned out to be a plugged heater core...they flushed it back and forth a few times and now I have HEAT!!

Good, that really surprised me.

Did you keep the antifreeze up to date?

No never changed it.I never had this problem but it had fresh in it now.

How many miles on it?

I always figured 100K or 6 years on a change.

There were tons of issues on older cars, but they never ran that many miles.

205k

Never changed?

No..only time anti freeze would get changed if I sprung a leak All the guys at work said the same thing never changed theirs either

I can see why it plugged, wow what a lifespan.

I will run it a week and then I have plans on changing it again.

Good Luck

I didn't see the first post. I have '02 F150. About every two years I have to back flush mu heater coil. Went to a shop, need to replace the heater coil, approx $1500.00, bought two hose fittings M & F. Back flushed and have heat , cost less $10.00 not counting my time.

I had a heater inlet neck get plugged with a glob of silicone that broke loose from somewhere else in the system. The heater was easy to get to so the fix was easy. Now the rest of the story. I have to admit I was the only one who had ever worked on the cooling system in the past so I was the culprit. It taught me a lesson, I have used very little of the stuff since then.

Many years ago, I was working in an independent shop and a customer with a Chevy S10 came in wanting the coolant flushed. I did that, no problem.
He then came back afterwards saying that he had no heat, and that I had done something to his truck because "I had heat before you did worked on it."
With my hands, I followed the trail of heat by grabbing the heater hoses and they were both cold. I unhooked them from the heater core, cut about a foot length of heater hose from the new box of heater hose that we had on the shelf and backflushed his heater core. There was all kinds of junk and solids that came out of the heater core. Because the customer was looking over my shoulder the whole time, I just casually ask him "Are you sure you had heat before?" He didn't say a word. I connected the old heater hoses back to the heater core, refilled the radiator, made sure he had good heat (he now did), charged him accordingly, and sent him on his way.
The worst part of this was that my tightwad boss saw the one foot of heater hose that I had cut (I needed that so that the old junk and coolant wouldn't get the engine and compartment wet with coolant) and chewed me out for using a new piece "that couldn't ever be sold". I asked him how he would have done it and all I heard was crickets.
I didn't stay there too long after that.

(quoted from post at 16:28:07 10/21/20) After exhausting all possibilities I took my truck to a shop It turned out to be a plugged heater core...they flushed it back and forth a few times and now I have HEAT!!

Click to expand...

or antifreeze in general it is recommended to flush every two years. The Prestone flush won't dent calcium build up but is a good product for breaking down rust and trash. Gambles former employer sounds familiar.