93 5.8 Overheats @ Idle In Hot Weather

[DragonDave]

Well I actually currently own two Broncos a 92 Custom & a 93 XLT. Both are autos and 5.8s. I have noticed when I am out in warm weather say 90-100 degrees while at idle both of my broncos start to run hot & close or at overheat sometimes within 15 mins or so. Just a small recap the cooling systems, they are in good shape both with recently new radiators & stock temp thermostats which are flowng well with 50/50 coolant. There is also no leaks in the cooling systems. I am assuming both fan clutches are good since I find it hard for two to be bad at once on both trucks. As soon as I get moving either via driving or more rpm they both seem to cool down to normal. I kinda suspect the stock fan might not flow enough air at idle. I've heard there are some fan assemblies out there that are made to flow more air via different blade configurations etc. I also considered an extra elec cooling fan till I looked & found one won't have any room to mount. I do alot of high desert off road here in So. Cal. I would appreciate any input/suggestions any of you might have. Thanks! /emoticons/[email protected] 2x" width="20" height="20" />

 

[indoz]

Two suggestions, change the thermostat to 160* and install an oil cooler on the auto gearbox, also try to let some of the hot air out from under the bonnet, in summer here in hot W. Australia I remove the rubber weather strip from the rear of the bonnet to allow hot air to escape.

Henk from Oz

 

[bluesman17]

I was just told today that my 5.0 (by my engine guy) wouldnt accept a low temp termostat and would cause cooling problems. Its worth a shot though.

 

[Seabronc]

Go for it. Indoz is right. I added a transmission oil cooler about a year ago, and it significantly lowered my engine temp. In haot weather it use to run about midrange on the temp gague, I don't ever remember running above 1/3 when really working, normally it runs at about 1/4 up on the gague.

If you do any pulling, you might also consider an oil cooler.

Good luck,

>-

 

[indoz]

Can I make a suggestion, when installing any aftermarket oil cooler, do not follow the instructions given i.e. use the nylon straps to fit cooler onto the radiator. In our vehicles there is enough space and enough frame work to mount the cooler at least one inch in front of and away from the radiator, to me it defeats the purpose to fit one radiator against the other, heat transfer.

Henk from Oz

 

[DragonDave]

Thanks Guys! /emoticons/[email protected] 2x" width="20" height="20" />