drilling the 180 T-stat
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True Car Nut
Joined: May 2003
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From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___

What size of bit should i use and how many holes and is there a good specific spot on the Thermostat its self for this?
What size of bit should i use and how many holes and is there a good specific spot on the Thermostat its self for this?
If you are concerned about getting any heat to defrost your windows, you should probably not drill any holes......and maybe keep the 195 stat in until spring, then swap it out for the drilled 180 stat.
If you don't care, my recommendation is that you use a 1/16" diameter bit. Drill 1 or 2 holes just inside the edge of the rubber ring gasket.
If you want a really long warm up period and don't care about losing 1-2 mpg drill 4 holes.
Originally Posted by 2000SilverBullet
What size of bit should i use and how many holes and is there a good specific spot on the Thermostat its self for this?
If you are concerned about getting any heat to defrost your windows, you should probably not drill any holes......and maybe keep the 195 stat in until spring, then swap it out for the drilled 180 stat.
If you don't care, my recommendation is that you use a 1/16" diameter bit. Drill 1 or 2 holes just inside the edge of the rubber ring gasket.
If you want a really long warm up period and don't care about losing 1-2 mpg drill 4 holes.
My 92 SE ran a drilled 180 T-Stat with 2 - 1/16" holes in it just as SilverBullet suggests. I ran the STOCK 195 in the colder months too BTW!

well.. just thinkin bout the water pump.. when the stat is close and the thing is still running.. does that wear the pump out cause it'* creating more pressure or is there a clutch on it??
Thread Starter
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True Car Nut
Joined: May 2003
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From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___

My bonneville runs hot..it almost over heated with the 195 and with the 180 on a mid 70-90 degree day its running close to the red zone on the gage, this is with the AC on or off, one day i even cranked the heat on max and put all the windows down to help it keep cool but it was 110 that day...i flushed the coolant in May, with water only im thinking of using a cooling flush product next time to help clean all the **** in there that might be clogging it up. For the winter i prolly will go back to 195 but the 180 seems let the car average 90 celcuis on the gage (the half way point). and produce nice hot air.
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