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Subject: F-150 still overheating

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lonestarjeff    Posted 07-25-2018 at 20:32:13 [URL] [DELETE]        [Reply] [Email]  
  • F-150 still overheating
  • Well, the old 2000 F150 has been perking along just fine until the dog days hit around here this past month. The 4.6L V8 has 222k miles on it now, but the overheating problem started a couple of summers ago when I would tow my trailer in 90+ degree weather, never any trouble in any conditions prior to that. Now, it overheats any time I go out in 90+ degrees IF I run the A/C, no problem if I leave the A/C off.

    Back when this started a couple of years ago I replaced the following in this order...coolant flush & fill with a new T-stat...no effect; fan clutch & T-stat(again)...no effect; lower radiator hose...no effect.

    I bought a new Gates water pump at the time, but just installed it yesterday. I didn't see any signs of wear on the old Motorcraft pump, it actually looks like a better pump than the Gates, longer impeller vanes.

    If the new pump made any difference, I'd say the problem is actually worse. So, I guess the only thing left to do is find a radiator shop or order a new one.

    Tim Daley(MI)    Posted 07-29-2018 at 18:40:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • HiYa Jeff-
    It's been a long time buddy. I know this doesn't answer your question but my old childhood good friend and guitarist Bill is an over the road trucker. He had a load going to Mexico and so was down in Laredo all week. He called me on Friday and said he was on the road out of there and he couldn't be happier as it was 110F all week. I'd been told once by a mechanic to run your heater in the summer when it gets unbearably real hot to blow off excess heat from the engine and radiator. I don't know about that. Running the AC will put an extra strain on the system though. It's always funny here in Michigan to listen to people complain in January that it's too cold and are just wishing for this 80F weather and then in July when it's 80-90F they pray for 20F weather. Good luck with your F150 -good trucks.

    Tim Daley(MI)

    lonestarjeff    Posted 07-29-2018 at 19:03:04 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • Hey Tim! We're the same way down here except it's dry vs wet weather, whichever one we've got we pray for the other.

    Both the F150 & the Expedition(both same year model & same drivetrain)have been the most trouble-free vehicles I've owned. I'll keep knocking on wood & doing the maintenance....but I have to admit the 2017's look pretty good. :-)

    Tim Daley(MI)    Posted 07-30-2018 at 04:53:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • I miss my '96 F-250 4 x 4, It was the best vehicle I ever owned. I'm thinking of leasing an F-150.

    Tim Daley(MI)

    WayneIA    Posted 07-26-2018 at 21:34:09 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • If you have a crack or a bad head gasket, you should have had poor heater performance in the winter. It's time for a radiator recore

    Kurt in Iowa    Posted 07-26-2018 at 06:55:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • After all you've done I'd start to suspect a blown head gasket or cracked block. With the engine running and warmed up I'd take off the radiator cap and watch for bubbles.

    lonestarjeff    Posted 07-27-2018 at 16:07:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • No bubbles, just starts going up when I run the A/C, goes back to normal when I switch it off. I've replaced everything but the radiator, so it must be restricted...ordered a new one , so we'll see how it goes installing a dual core.

    Walt/Tx    Posted 07-28-2018 at 10:39:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • Im glad youre trying to keep ol Red running Jeff. You know I had the identical truck until traded in 2015, was the best truck I ever owned. It had 220k on it and new owner still uses it daily. Good luck on that radiator installation.
    Walt

    lonestarjeff    Posted 07-29-2018 at 09:06:37 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • Thanks Walt, I'll report back after installing the new radiator this week. I seem to remember you having an F150 of that same era, but couldn't remember which model & engine pkg yours had.
    Jeff

    dave#1    Posted 07-26-2018 at 08:48:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • Agreed, Check for a bad head gasket or cracked cylinder head, I've run across it 3 times , once with one of our Caravans, a friends car and the Volvo pay loader I drove at work, We had bought a Combustion Leak Detector to test the loader, very easy to use and fairly cheap.
    Water pumps rarely stop pumping, usually the seals go bad and then leak out the weep hole in the bottom of the pump.

    HTH

    later,dave

    steveVa    Posted 07-25-2018 at 21:46:23 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • do you have an oil cooler? do you have a trans cooler?
    you could add an electric fan. you could add a supplemental radiator with a spare heater coil and another small fan.
    Or recore the radiator or see if they hV an aftermarket one for towing.

    lonestarjeff    Posted 07-25-2018 at 23:15:20 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • Yes & Yes. Looks like a good double row core aftermarket radiator is around $100(less than I expected). The original one with the 4.6 is a single row core.

    Just for grins I went out & checked the lower hose(the one I replaced a couple of years ago)& it's pretty soft, definitely softer than the one on my Expedition. Now I'm starting to wonder if I actually changed the one on the Exp & the one on the F150 is original. :-(

    Bruce(OR)    Posted 07-26-2018 at 09:02:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • That lower hose should have a spring inside it to keep it from collapsing.
    I found a spring and shoved it into my upper hose as well. Stay away from coolant that is a buck or two cheaper. Get the good stuff. As for the rad, I am surprised your not running at least a 2 row with A/C.
    Bigger is usually always better.

    lonestarjeff    Posted 07-27-2018 at 16:03:04 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • The single always seemed to be adequate until a couple of years ago, but I agree a dual core will be better.

    steveVa    Posted 07-25-2018 at 23:53:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: F-150 still overheating
  • a new radiator for $100 is hard to beat, but putting it in there is another story.

    lonestarjeff    Posted 07-27-2018 at 16:01:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: F-150 still overheating
  • Ordered one last night after changing the lower hose to no avail. Went ahead & ordered a dual core, we'll see how the install goes. :-)

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