Coolant leak after thermostat change - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 03-08-2014, 07:08 PM Thread Starter
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Coolant leak after thermostat change

I'd been noticing that my coolant temps weren't rising above 181 so I figured my thermostat was stuck open so I swapped it out. After starting it back up, once it hit operating temp I noticed coolant leaking. So I removed the new t-stat, checked the o ring and reinstalled it. Again, coolant started leaking at operating temps.

Frustrating as I ran out of time this evening to further troubleshoot. I checked closely around the thermostat housing but it doesn't seem to be leaking.

I'm wondering if the new thermostat, now that it creates a closed circuit, is now creating pressure causing a leak to develop elsewhere? Thoughts?
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post #2 of 4 Old 03-08-2014, 08:36 PM
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You sure its not leaking around the spring clamp? Or did you replace it with a hose clamp. Depending on how new the hose is, spring clamps are kind of a "one time use" type deal.


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post #3 of 4 Old 03-08-2014, 09:17 PM Thread Starter
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Ya,I replaced the spring clamp with a new screw type. Will try putting the old t-stat back in and see if the leak stops. If it does I'll know it's a pressure related leak and will probably have to replace the water pump. I've also heard that leaks can occur around the sending unit as well but if that's the case I might as well replace the water pump anyway.
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post #4 of 4 Old 03-10-2014, 07:30 PM Thread Starter
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Well it turned out to be the shaft seal failing out on the water pump. Gotta love chain reactions. Replacement was made easy using the instructions I found on here. Good stuff! Although I gotta love my wife coming out and looking at me frustrated and telling me "You're in over your head." Well lil miss, I proved you wrong!! Lol
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