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Cooling Question - First Gen.


Bronco648

Active Member
Joined
May 23, 2019
Messages
414
Reaction score
102
Points
43
Location
Chicago-land, Illinois
Vehicle Year
2011
Make / Model
XL
Engine Type
2.3 (4 Cylinder)
Engine Size
2.3
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
15"
Factory parts in this picture, no idea how to keep that ring in place while tightening it down.
It's interesting but the O-ring I installed was slightly too big to fit into the t-stat opening in the water pump body (Fel-Pro IIRC). I may have discovered the solution by mistake. Initially, I installed the O-ring and gasket backwards. I then looked at the image I posted and discovered my error. By that time, the Permatex form-a-gasket had begun to set-up. So, the O-ring ended up getting 'glued' to the flat gasket. I believe that's what's holding it in place.

Additionally, I think the 'bridge' on the t-stat needs to be oriented vertically (90* from what's shown in your image). Why? Because the water neck, that bolts to the water pump, brings water in from below. So, if the O-ring happens not to seat properly, the bridge will prevent the coolant from 'washing' the O-ring into the t-stat opening (when hot) which would create a (partial) restriction.
 


Bronco648

Active Member
Joined
May 23, 2019
Messages
414
Reaction score
102
Points
43
Location
Chicago-land, Illinois
Vehicle Year
2011
Make / Model
XL
Engine Type
2.3 (4 Cylinder)
Engine Size
2.3
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
15"
Two Week Follow-up

The cooling system has been working very well. We've had temps near 50* and temps below freezing. I can hear the fan kick on/off so I know the t-stat is opening and closing and coolant flow must be better. At this point, I'm pointing the finger at an improperly installed t-stat O-ring. It must not have seated properly and was partially obstructing the coolant flow thru the t-stat.
 

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