SOHC Coolant leak.

[00XLTJE]

So I replaced my thermostat and did a coolant flush, now it appears I have a leak. I've double checked everything and I put everything back together correctly. I can't pinpoint where it's coming out at, but I can see where it's dripping. It's to the left of the water pump maybe midways down (water pump gasket looks dry). Any ideas? The red circle is where I see the coolant dripping from.

Thanks.

 

[00XLTJE]

I should add it only leaks when running.

 

[swshawaii]

Eliminate any guessing and rent a fully refundable coolant pressure tester from most larger auto parts stores. Call around.

 

[00XLTJE]

Thanks for the suggestion.
I took off the plastic cover on top of the engine to get a better look at things.
When I rev up the engine I can see coolant spraying from the lower thermostat housing. Woohoo.

 

[swshawaii]

By far the most common failure with the 4.0 SOHC's cooling system. Hundreds have been replaced on this forum.
Here's a great OEM upgrade if you have threaded sensors. Basic repair only requires housing, sensors, and seals.

http://www.explorerforum.com/forums/showthread.php?t=239493

 

[00XLTJE]

Thanks alot! I'll do that.

 

[00XLTJE]

Another question, what sensor are in the housing? Obviously one is the ECT, but what's the other? Goes in the hole to the right on the pictures sensor. Which is which?

 

[swshawaii]

The engine coolant temp (ECT) sensor has smaller threads than the gauge sender.

http://www.explorerforum.com/forums/showpost.php?p=3390194&postcount=2

http://www.explorerforum.com/forums/showpost.php?p=3346275&postcount=3