Recent Topics
JD tractor. did I do right?
by Snowball
48 minutes 46 seconds ago
7/30-8/26 O'Reilly Sales Ad
by tenderloin
Today at 12:32 AM
blown engine
by meme6885
Yesterday at 11:52 PM
Oil change tommorow
by Samf333
Yesterday at 11:25 PM
Anti-Oxidants
by MolaKule
Yesterday at 11:09 PM
Autozone full synthetic 5w-30
by lawman1909
Yesterday at 09:14 PM
Battery change in Prius
by tig1
Yesterday at 09:11 PM
Wierd Diesel Generator Cylinder Damage.
by Lewis
Yesterday at 08:48 PM
Barbecueing at a gas station
by y_p_w
Yesterday at 08:22 PM
Reading spark plugs. Too hot?
by italian68
Yesterday at 07:46 PM
Need basement bulkhead ideas
by eljefino
Yesterday at 07:38 PM
Champion Brands 5W-20 Synthetic Blend $2.46 qt
by Warstud
Yesterday at 07:31 PM
Newest Members
StephenSanchez, Tony05, sacamano, handy, amber
50800 Registered Users
Who's Online
31 registered (Doug Hillary, 901Memphis, Drew99GT, chrisri, bimmerdriver, 4 invisible), 757 Guests and 229 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50800 Members
64 Forums
217018 Topics
3416887 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#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?
_________________________
97 Explorer 4.0L SOHC - 155k - ML 5w-30/PL30001

04 Safari 4.3L - 235k - ML 5w-30/L24011

05 Silverado 6.6L DMX - 135k - Ams AME/EAO52

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


Registered: 09/14/10
Posts: 835
Loc: California
Compare it with one of your cars.

Top
#3392236 - 06/08/14 02:14 PM Re: Radiator pressure [Re: justinf89]
Chris142 Offline


Registered: 06/05/03
Posts: 11081
Loc: apple valley, ca
Is the radiator full?
_________________________
02 Jeep Wrangler super-s 10/30
87 F250 Diesel Delo 15w40
04 Tahoe STHM 10w30
Z400 napa 15w50
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

Top
#3392247 - 06/08/14 02:32 PM Re: Radiator pressure [Re: justinf89]
Warstud Offline


Registered: 09/02/05
Posts: 2656
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.

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


Registered: 12/16/12
Posts: 703
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
_________________________
1996 Nissan Maxima 5W30 ST and Puro Classic L14610
2008 Chevy Uplander 5W30 ST and Puro Classic L25288

Top