coolant pressure with bad oil cooler - Ford Powerstroke Diesel Forum
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Old 07-01-2014, 04:44 PM
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coolant pressure with bad oil cooler

If oil cooler is failing will coolant system hold pressure. Shop says coolant system hold 30 psi, but I didn't thing they are running truck during test. Because when I drive truck after 20 miles the truck loses a gallon of coolant .
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Old 07-01-2014, 05:05 PM
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typically you don't run the truck while pressure testing the system

did the cap get tested ??

do you have any idea where the coolant is escaping ?
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Old 07-01-2014, 05:22 PM
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Have new cap and no didn't know where coolant is going. Shop changed oil last week and check to see if coolant was oil. Found no coolant in oil.
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Old 07-02-2014, 02:08 AM
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If they pressure tested to 30 and it held for awhile they eliminated most external leaks.
Your engine may be eating the coolant but you should be seeing a lot of white smoke/steam out the exhaust.

By the way you will probably blow the egr cooler before you get a big pressure rise from a restricted oil cooler.
Coolant flows thru the oil cooler and then feeds the egr cooler. The restricted oil cooler wiil not pass enough coolant to the egr cooler and the hot exhaust gasses cause the coolant to flash boil and rupture the cooler.

Last edited by dannyboy950; 07-02-2014 at 02:20 AM.
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Old 07-02-2014, 08:21 AM
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Yikes, A gallon of coolant after 20 miles is a lot. At that rate you would definitely either see a lot of white smoke, or coolant dripping.

By oil cooler failing, do you mean ruptured? If it's ruptured you will get oil in the coolant, coolant in the oil. If it's plugged, you will get high EOT/ECT deltas.

Maybe pull your EGR and take a look to see if it's wet.
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