Coolant Got Hot Today

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Mar 22, 2011 | 09:08 PM

mblanken881

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Joined: May 2008

Posts: 550

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From: Sioux City, IA

Coolant Got Hot Today

05 F250 6.0l Fx4 CC. All winter long (I live in Nebraska) my coolant temps were always running from 182 up to 190. Mostly closer to 182. Recently its been fairly warm here (60s to 70s) and my coolant had been running anywhere from 188 to 191 which seemed normal. BTW - at ECT of 190 my EOT is 200-201 just in case you are curious. Today the outside temp got up to the mid 70s and was humid. On my way home from work on regular city streets my ECT was varying from 188 to 202. I have never seen my ECT that high except when I was towing in the mountains. The EOT was always 8 to 11 degrees warmer.

Is this normal for my ECT to get that high on city streets in normal driving conditions? FYI - the truck probably never got above 2500 RPMs.

If there is a problem, how do I diagnose it?

Mike

Mar 22, 2011 | 09:19 PM

cartmanea

Lead Driver

Joined: Jun 2007

Posts: 6,757

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From: Corvallis, OR

I wouldn't worry about it much. The fan should kick on high around 200-210, have you heard that at all? It might be worth verifying the fan operation if you know somebody with AutoEnginuity, or have it checked at the dealership.

Mar 22, 2011 | 09:21 PM

mblanken881

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Joined: May 2008

Posts: 550

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From: Sioux City, IA

I didn't hear the fan today but when towing my trailer through the mountains it came on when the temps got high.

Mar 22, 2011 | 10:53 PM

Unrealo4

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Joined: Nov 2010

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From: Eagle Mountian, Utah

My fan won't kick on until 218 just like clockwork. I wouldn't worry about those temps. But the spike seems weird on normal driving.

Mar 22, 2011 | 10:56 PM

bismic

Fleet Owner

Joined: Nov 2003

Posts: 27,901

Likes: 3,617

The fan actually does not kick on at a specific coolant temperature (although it might seem like that in a few cases). There are a number of things that are involved w/ the PCM decision to kick on the fan.

Mar 23, 2011 | 08:45 AM

rdunagan

Posting Guru

Joined: Oct 2010

Posts: 1,192

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From: Kerrville, Tx

im having the same problem around town also. i think its because its just getting warmer. although im doing a coolant flush this weekend to see if that helps.

Mar 23, 2011 | 06:49 PM

cheezit

Post Fiend

Joined: Oct 2009

Posts: 12,123

Likes: 35

From: N. Fort Worth, tx

i run 198-208 empty depending on driving and weather.

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Mar 23, 2011 | 08:56 PM

BlueMonster33

Freshman User

Joined: Mar 2011

Posts: 47

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I don't have a coolant temp gauge yet but Im investing in the edge cts just bought the truck a little over a month ago, but what I did do is hook up a highly sensitive psi gauge for refrigeration that will measure the coolant pressure. I teed it off of the degas bottle and ran the hose through the fire wall. Do you guys know by chance what I should be running psi that is? I have been running at between 5 to 10 or so on normal operation and 13 to 15 when I am pulling a trailer it just seems high to me cause isn't pop off at 16? My fan usually kicks on when the psi is around 10 and usually cycles on to keep it there unless Im pulling my trailer don't know the exact temp. (Yet)