Underhood heat issues

[LEB Ben]

The ford gauges are prone to fluctuate on their own for no specific reason

I know this Dennis, that's why I also used an aftermarket electric gauge and a laser thermometer.

This is why one uses a candy thremometer on an open cooling system ..occasionally revving the engine then let it idle for 30-40 minutes

did that in the driveway, but when in traffic and idling or low speed/rpm, the temp starts rising pretty quick.

Unless there coolant blowing out the cap, it is NOT overheating,regardless of what the gauge says

Overheating was due to a tsat stuck closed. I got that fixed, now it's low speed/rpm temp rising quickly that has me worried. IIRC, this is usually water pump or fan clutch issue. On top of that, but a much lesser issue, I'm not thrilled about the radiant heat.

Don't run anything less than a 180*F T-stat

I run a 180* in the summer and 192 in the winter

The engine normally runs at 200-208*F

Coolant temp is within spec

Do you have a fan clutch or viscious fan ?

fan clutch

How many of the vanes on the rad are flattened out restricting air flow

There's about 1/2"x1/2" area that's smooshed.

If you lightly run your finger down the vanes do they bend over easy or do they scrape your skin

Scrape my skin

With the cap off at normal operating temp do you see coolant flow past the cap opening ?

Yes I do

Too me that sounds fairly normal. I drove my truck 2 blocks the other day and hit operating temp. after it idling for about 3 minutes. But it also was 100 degrees out.

Dang really. Maybe since the rebuild, I'll just have to get used to the new running characteristics, but out of the dentsides I've had, this just didn't seem typical.

i know this sounds crazy but my radiator was clogged i needed to drive my truck and had no money for a new radiator. but i had a bottle of c.l.r that stuff they advertise on tv as the super cleaner. i drained my radiator and put the bottle of c.l.r in with hot water and ran the truck for a bit. then drained the stuff into a jug and cycled the stuff through the radiator for about ten minutes and the really flushed the engine and everything with fresh water. the inside of the radiator looks brand new and no more overheating.

Thanks man...that's what I was looking for. How long did you cycle the straight water for the final flush?????


And does anyone else have any other suggestions on cleaners for the flush?

 

[m78]

i know this sounds crazy but my radiator was clogged i needed to drive my truck and had no money for a new radiator. but i had a bottle of c.l.r that stuff they advertise on tv as the super cleaner. i drained my radiator and put the bottle of c.l.r in with hot water and ran the truck for a bit. then drained the stuff into a jug and cycled the stuff through the radiator for about ten minutes and the really flushed the engine and everything with fresh water. the inside of the radiator looks brand new and no more overheating.

You didn't have any leaks afterward ? I think CLR has muriatic acid in it.

 

[m78]

No...the 180 is fine. But how quick it heats up from cold and how quick it heats up while idling...and the fact you could bake a turkey under the hood has me concerned. I wanna know why it's putting off so much heat and why it's heating up so fast. Low rpm issues are usually water pump and fan clutch related, right?

Do you actually have the temp numbers as they changed during driving , idling, stop and go , or just shut down ?

My BII had similar problems and it was the gauge itself. I had to add a resister in line to it to keep the needle steady.

 

[LEB Ben]

^^^The actual temp gauge was only hooked up for idling and around the block.


However, I just had a duh-huh moment...thermostat went bad, I had issues the week prior...anyone think there's potential in the fact that the tstat was sticking the previous week. Since replacing the tstat, every reading seems normal and sounds like getting to operating temp can be considered normal.


So if I were a betting man, I'd say the tstat was simply sticking, then completely failed. And since I'm still breaking in the engine, and my timing was in fact a tad high, that can account for other heat issues.

 

[73F100Shortbed]

Sounds like it was sticking to me Ben. When I did my points today I let the truck get to operating temp and see how long it took. It was about 80 degrees outside. It hit 150 in just over a minute and was at 180 just a minute or two after.

 

[old blue]

no leaks after word. i cycled water for a good 15 minutes, and dont put ur face over the open radiator it will burn your eyes and nose. hope that helps