Coolant pressure
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Senior User
Joined: Oct 2011
Posts: 294
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From: Hanover, PA
Coolant pressure
To those running gauges on the degas bottle. I put one in today. It read steady at around 13 for a couple hours then spiked over 15 momentarily while going up a long grade on 81 here in PA. Was pulling an empty equipment trailer at the time and going about 70. Coolant temp did go up to about 220, fan kicked on at around 205? After, my pressure gauge never went above 8. Got to where I was going and did find some coolant had released from cap and my hose going to my pressure gauge has coolant in it. Does this effect how the gauge will read? Bottle was not over filled I keep it about a half inch below the sticker. All other readings are great, oil temps never more than 8 over coolant and didn't see over 205 this trip even with loaded trailer on way home. Kept my foot out of it for the way back loaded at around 65 and only flirted with 200 coolant temps going up hill. Can't say what pressure as it didn't move much after line was full of coolant.
2006 Bullet-Riddled 6.0
Joined: Sep 2011
Posts: 651
Likes: 5
From: Sac River Delta Ca.
The pressure will be the same whether it's wet or dry, that I assure you. 8 psi is a good pressure for constant cooling system pressure.
Lowering the coolant level a bit more will also lower the pressure in a cooling system because the increased air will give more cushion for thermal expansion.
Also another way to confirm combustion gases are not entering the cooling system is:
After engine is fully up to operating temperature release pressure at the cap. Then continue to drive the pressure should not climb at all since thermal expansion should not increase.
Lowering the coolant level a bit more will also lower the pressure in a cooling system because the increased air will give more cushion for thermal expansion.
Also another way to confirm combustion gases are not entering the cooling system is:
After engine is fully up to operating temperature release pressure at the cap. Then continue to drive the pressure should not climb at all since thermal expansion should not increase.
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Senior User
Joined: Oct 2011
Posts: 294
Likes: 3
From: Hanover, PA
The part you mention of releasing pressure and then not building again would seem to fit here as i shut the truck down for about 20-30 min while i loaded the car on the trailer and had checked out the cooling system after i shut off tge truck.
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