where to drill hole in t stat

Where does it need to be

 

To what end? I see no reason to do so if it's working properly.

Devon

 

Ive heard of this being done, but dont recall the reason...

subscribing to see other replies...

 

I drill a ~1/16th hole near the edge, then install the thermostat with the hole at the top just to aid in getting the air out of the system. I've never actually bothered to time how long it takes with or with out the hole, so I have no actual proof of anything =P but when filling the cooling system it does give the air a place to go as the coolant fills up the block.

 

I drill a hole (1/16" I believe) close to the outer edge - you'll want
to put your thermostat in the housing and see how far out you
can drill the hole. When you install it, be sure the hole is at the
12 o'clock position, so any air pockets can migrate through.

EDIT: some thermostat manufacturers drill the hole and install
a copper "bobber" pin in the hole.

 

Thanks a lot guys. I plan on replacing my leaky t stat gasket, so I will do it then

 

While you have the thermostat out, you might want to test it to
be sure it opens at the prescribed temperature.

 

Well guys I have been keeping track since i drilled the hole in the t-stat and it looks like temps have dropped 10-15 degrees :beers2: depending on driving condithions and my overflow bottle stopped overflowing

 

This unfortunately should be done with new ones as well. I've had a couple bad ones (Stant brand) right out of the box. The misses candy thermometer and a pot of boiling water with a bit of salt (salt to raise the boiling temp)

 

the last new trhermostat i installed, a few ago already had the 1/16" hole drilled.