Installed new thermostat now leaking coolant

[Cali Cruse]

I've looked this up, so I'm looking at either a crap gasket or thermostat fell out of the recess and caused cracked housing upon tightening of the screws.

 

The bottom one was a pain, had help push it down so I could get to it. Another big challenge is that it's hard to get the bottom screw into the hole.

 

One last point, the thermostat purchased did not have a hole in it on top like the original thermostat, indicating insertion point. Is that an issue?

 

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[Jeep Driver]

46 minutes ago, Cali Cruse said:

thermostat fell out of the recess and caused cracked housing upon tightening of the screws

You aren't the first to have done that. 

 

46 minutes ago, Cali Cruse said:

indicating insertion point. Is that an issue?

No, doesn't matter. 

[AZJeff]

The small hole in the thermostat is supposed to help with "burping" the system to remove air upon refilling.   It DOES help.

 

Since only OEM thermostats have those, I always add two holes to my replacement thermostats before installing.  I drill a 1/16" hole 180 degrees apart  on the flange, and then install the thermostat with one of the holes at the "12 o'clock" position.

[Cali Cruse]

Interesting! It's what I thought as well. This Comanche forum is a treasure trove, it and Scotty Kilmer on YouTube.

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