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#3392205 - 06/08/14 01:51 PM Radiator pressure
justinf89 Offline


Registered: 07/11/10
Posts: 534
Loc: Hampton, VA
I've been doing maintenance on a buddys '07 explorer with the v6. I went to check the radiator and it had a lot of pressure after loosening the cap. This was after it sat overnight. I changed to coolant so I've been trying to purge the air, but it won't draw from the expansion tank.

Sound like a new cap is in order? Why wouldn't the pressure equalize overnight?
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97 Explorer 4.0L SOHC - 155k - ML 5w-30/PL30001

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#3392212 - 06/08/14 01:56 PM Re: Radiator pressure [Re: justinf89]
OneEyeJack Offline


Registered: 09/14/10
Posts: 2711
Loc: S California
Compare it with one of your cars.
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#3392236 - 06/08/14 02:14 PM Re: Radiator pressure [Re: justinf89]
Chris142 Online   content


Registered: 06/05/03
Posts: 12356
Loc: apple valley, ca
Is the radiator full?
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#3392247 - 06/08/14 02:32 PM Re: Radiator pressure [Re: justinf89]
Warstud Offline


Registered: 09/02/05
Posts: 3255
Loc: MIchigan
Make sure the air is purged from the cooling system before you suspect somethings wrong with the Rad Cap. Try jacking up the front end and running it with the cap off.

FYI: On a cold motor the Rad should be full and the expansion tank should be at the Cold mark. When the motor gets up to temperature the expansion tank should read Hot. When you shut the motor off the Rad should draw coolant from the expansion tank
until it fills up and the expansion tank should read Cold again.

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#3393461 - 06/09/14 09:02 PM Re: Radiator pressure [Re: Warstud]
asand1 Offline


Registered: 12/16/12
Posts: 1122
Loc: Oregon coast
Originally Posted By: Warstud
: On a cold motor the Rad should be full and the expansion tank should be at the Cold mark. When the motor gets up to temperature the expansion tank should read Hot. When you shut the motor off the Rad should draw coolant from the expansion tank
until it fills up and the expansion tank should read Cold again.


This will only happen when the cap is not plugged
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