OEM Thermostat small hole to assist air release

[virginoil]

http://www.pontiacbonnevilleclub.com/forum/viewtopic.php?f=53&t=159

I may start with this and add more holes progressively if required.

either a single 1/16" hole or

two x 1/32" holes with one at 12 o'clock and one at 6 o'clock positions.

This way I can up the size if the hole/s too small.

 

[virginoil]

I found a Stant ST7-195 thermostat made in USA it has a tiny bleed notch/cut out on the inside flange.
It looks like just around 0.7mm dia, (less than a 1mm) or approx 1/32 inch dia.

Its not the SuperStant.

This Stant thermostat looks just like the ones Holden are importing and repackaging as OEM that I saw at the dealer.
It has the same stamp on the top flange and spring assembly.

I will run with this and no mods to see what happens.

 

[barkingspider]

If it's oem, I would not drill. Why don't you just replace the oem stat w one that already has a hole in it?

 

[virginoil]

Originally Posted By: barkingspider
If it's oem, I would not drill. Why don't you just replace the oem stat w one that already has a hole in it?


Yep thats what i will do.

 

[dlundblad]

If it didn't come with a hole, I'd leave it alone. If not OEM, get a name brand after-market like Stant or Gates.

I bought a Mopar stat for my Jeep that came with a hole as well as a brass bleeder crimped inside the hole. Since it has a rivet on the side of the pressure, I imagine it seals while its under use thus eliminating the hole.

 

[Oldmoparguy1]

Originally Posted By: dlundblad
If it didn't come with a hole, I'd leave it alone. If not OEM, get a name brand after-market like Stant or Gates.

I bought a Mopar stat for my Jeep that came with a hole as well as a brass bleeder crimped inside the hole. Since it has a rivet on the side of the pressure, I imagine it seals while its under use thus eliminating the hole.

A little more, possibly useless info. The Chrysler 3.3 & 3.8 V6 thermostats came standard with "jiggler" ball bleeder, the 8V I-4 did not. After-market ones didn't either. I always bought the OEM V6 ones for my turbo 4 cylinder motors. The fit perfectly, and saved a lot of problems with bleeding the cooling system.