5.8L engine getting hot...

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Mar 7, 2001 | 01:27 PM

75highboy

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Junior User

Joined: Sep 1999

Posts: 86

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From: near St. Louis USA

5.8L engine getting hot...

I have a '93 Bronco with a 351. At highway speeds (60-70 MPH) my temp gauge goes to the "L". The overflow bottle fills up too. When I slow down, the temp comes back to normal (where it's been for years- around the "N"). The temp stay down with around town driving. The water pump and thermostat were replaced a year ago. I replaced the radiator cap last week, but that didn't help. What do ya'll think.

'75 Highboy
1975 F-250 4x4 (390, T18, p/s conv.)
1988 Ranger 4x4 (5.0 EFI, T5 trans.)
1993 Bronco 4x4 (5.8 EFI, no mods yet, it's just the "family wagon"!)

Mar 7, 2001 | 01:49 PM

paulg

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Joined: Jun 2000

Posts: 464

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5.8L engine getting hot...

I'm sure you probably don't want to hear this, but the truck's thermostat could be faulty.

Mar 7, 2001 | 02:17 PM

Franklin2

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Joined: Jan 2001

Posts: 56,992

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From: Virginia

5.8L engine getting hot...

Somebody told me this and I have not yet proven it wrong many
times. Overheating in city driving is an airflow problem.
Overheating on the highway is a coolant flow problem.
So to apply this rule you would have a coolant flow problem.
1. clogged radiator
2. thermostat not opening fully
3. spring missing in lower radiator hose
4. build up of deposits in engine
5. head gaskets put on backwards
I'm sure there are other things-just think coolant flow

Mar 7, 2001 | 07:29 PM

jakegypsum

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Joined: Sep 2000

Posts: 1,586

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From: Linwood, N.J. USA!

5.8L engine getting hot...

One last thing to check is the fan clutch. Make sure that it is turning good at high RPM. Weak fan clutches will just float sometimes allowing the engine to heat up. Good luck.

Jakegypsum // Ford fleet, soup to nuts.