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2012 GMC Terrain 3.0L V6 Cooling System Pressure Testing #5288573 12/08/19 01:52 PM
Joined: Jan 2004
Posts: 6,031
benjamming Offline OP
OP Offline
Joined: Jan 2004
Posts: 6,031
2012 GMC Terrain 3.0L V6 Flex fuel with 207k miles
Intermittent coolant usage with leak source not obvious. It doesn't appear to be mixing with the engine or transmission oil. No external leaks noticed. No sign of coolant leakage at water pump weap hole. All hoses seem to be sound including those at the firewall, bypass, etc. Reservoir tank seems fine. Next step is to pressure test I think. Surge tank cap is rated to 15 psi. The top of the pressure tank has a vent hole so does the adapter cap block this hole? Can anyone provide the adapter kit # to use for this vehicle or other recommendations?

Thank you.

Re: 2012 GMC Terrain 3.0L V6 Cooling System Pressure Testing [Re: benjamming] #5288630 12/08/19 02:37 PM
Joined: Jun 2003
Posts: 20,126
Chris142 Offline
Joined: Jun 2003
Posts: 20,126
Yes the correct adapter will block the vent.

02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: 2012 GMC Terrain 3.0L V6 Cooling System Pressure Testing [Re: benjamming] #5288793 12/08/19 06:15 PM
Joined: Aug 2004
Posts: 1,508
Rhymingmechanic Offline
Joined: Aug 2004
Posts: 1,508
I "rented" the pressure tester kit from Advance last year. It had something like two dozen adapters, one of which fit the pressurized overflow on my Silverado. There was also one to check the cap itself.

The tester not only verified my leaking water pump, but showed me a hose leak I never would have found.

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