Normal opperating temp on 5.8?
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Posting Guru
Joined: Jan 2009
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From: Wyoming
Normal opperating temp on 5.8?
Real quick, I have been encountering something that has drawn my attention. My 94 F-350 Dually is equipped with a 5.8 E4OD, and usually when I take the highway I cruise along at 75mph. Now whats interesting, is lately the gauge reads it running a little warmer then usual. Where it used to run between the O and R on NORMAL, its now running between the A and L of NORMAL. Coolant is excellent and mixed correctly, and recently changed after the first time it read warmer.
Now whats normal for these models? I am asking as I am wondering if I need to look into replacing something! LOL
Now whats normal for these models? I am asking as I am wondering if I need to look into replacing something! LOL
Senior User
Joined: Nov 2008
Posts: 113
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From: Western NC
My 89 5.8L never goes past the R in normal, but I don't trust the stock temperature gauge. I bought a replacement for it yesterday :-) I'd go ahead and throw a new thermostat in it if you haven't done one lately just for good measure.
Lead Driver
Joined: Feb 2000
Posts: 5,374
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From: Palm Bay, Florida
Plus 1 on replacing the tstat-I'd go to a 180* unit for that engine/truck-espessely in the summer-but do not go any lower with a computerized/injected engine-may be its time for a cooling system flush too??
I have had good luck with the prestone flush & fill kits available at most parts stores......I'd remove the old tstat temporarely re-install the tstat housing & hoses even if it leaks a little, flush out the system well, then install the new tstat & also do yourself a favor & install a new bypass hose while you are in there-they are a bugger to do on the road when they blow & everything is hot! Good Luck!
I have had good luck with the prestone flush & fill kits available at most parts stores......I'd remove the old tstat temporarely re-install the tstat housing & hoses even if it leaks a little, flush out the system well, then install the new tstat & also do yourself a favor & install a new bypass hose while you are in there-they are a bugger to do on the road when they blow & everything is hot! Good Luck!
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
The temp gauge is almost useless on these things, but you may have an air pocket in the engine now after the fluid change. Elevate the nose of the truck and run the motor with the rad cap removed to ensure all air escapes.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
The first thing I would do is hook up an aftermarket gauge, even temporarily, and see where you are really at. Ford's gauges are not known for being reliable or accurate.
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Posting Guru
Joined: Jan 2009
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From: Wyoming
As for the gauges, yeah, as far as I could remember, they were never really the greatest. I use them as a generaly reference point until I put in aftermarkets.. LOL! But yes, I will be installing those too!
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