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Old 01-31-2007, 11:55 AM   #11
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get a new o-ring, they are cheap... 00+ dont need a paper gasket either
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Old 01-31-2007, 03:33 PM   #12
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A 180 T-stat is useless unless you have the PCM code changed to match it. Either get the stock 195 T-stat or get a 180 T-stat along with an aftermarket PCM like INTENSE offers.
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Old 01-31-2007, 05:32 PM   #13
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Quote:
Originally Posted by Rogue
A 180 T-stat is useless unless you have the PCM code changed to match it. Either get the stock 195 T-stat or get a 180 T-stat along with an aftermarket PCM like INTENSE offers.
The 180* t-stat will still try to maintain 180* coolant running through the engine by opening up at 180* instead of 195*. All the aftermarket PCM will do is make the fan come on sooner. Therefore, a 180* t-stat will not be totally useless.
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Old 01-31-2007, 05:51 PM   #14
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agreed, whilst in motion, a 180* WILL in fact make a difference, at a standstill, or in hot climates, a 180* on its own will not fully manage lower operating temps
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Old 01-31-2007, 05:52 PM   #15
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Quote:
Originally Posted by BoneZ
Quote:
Originally Posted by Rogue
A 180 T-stat is useless unless you have the PCM code changed to match it. Either get the stock 195 T-stat or get a 180 T-stat along with an aftermarket PCM like INTENSE offers.
The 180* t-stat will still try to maintain 180* coolant running through the engine by opening up at 180* instead of 195*. All the aftermarket PCM will do is make the fan come on sooner. Therefore, a 180* t-stat will not be totally useless.
The 180 will open at 180 but engine temps will still only cool down to the limit of the cooling system without fans (fans wont kick on until 212 low - 226 high). Granted this may be a bit cooler at speed or during colder months but at idle or during the summer no benefit is gained, and once the motor is heat saturated its harder to cool down.
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Old 01-31-2007, 07:49 PM   #16
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DONE! thanks so much guys! It took me more time to prepare to do the job than it did to actually replace it. I felt like I must have forgot something.... Thank you very much to everyone that responded.
BONNEVILLE CLUB STRIKES AGAIN!!
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Old 01-31-2007, 08:50 PM   #17
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Default Re: thermostat?

Quote:
Originally Posted by imidazol
Quote:
Originally Posted by briancole23
gauge reads around 150, am I safe in assuming that i need to replace my thermostat? If so, can someone tell me where it is located and if there is anything I need to know about replacing it (other than the usual two bolt and a gasket way that every other car that i have worked on has)? Thanks guys
If the digital gauge is reading 150 degrees you're probably collecting a lot of unburned stuff on the walls and into the oil. It'* not good.

You can drain a little coolant out of the radiator with a siphon hose,
remove the two bolts holding the thermostat housing on at the end of the upper radiator hose- I don't even remove the hose from the metal housing,
remove the thermostat with it'* rubber ring that seals it
replace with a new GM Delco which will come with the rubber ring, IIRC
be sure to put the pellet end into the upper manifold like the one you take out was
carefully thread the two bolts back on being careful not to cross thread (I did)
tighten to about the same as the ones you took off
refill the coolant into the radiator
replace cap
run motor to heat up
after bottom radiator hose is warm (after a good drive) rev motor to 2500 rpm 5 times to get air out of heater core--it helps if car is up slight slope forward to help air flow uphill to radiator
carefully open screw on top of thermostat housing to let air out of that point -- I hold a shop towel over the screw but it has never spewed out on me, but be safe

You probably don't have a paper gasket between the metal housing and the intake manifold. All you have is a rubber gasket around the thermostat rim. The new one may not even come with a replacement now that I think back. I reused the original--check the box when you get it.
I have one question... am i supposed to open the housing screw while its running or turned off? I did it while it was running and anti freeze did start coming out. I alos did it once while it was turned off and it still came out. It is running at 200 degrees now and I was beginning to think that I am suposed to wait for the system to totally cool down and then do it.
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Old 01-31-2007, 09:03 PM   #18
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Quote:
Originally Posted by toastedoats
agreed, whilst in motion, a 180* WILL in fact make a difference, at a standstill, or in hot climates, a 180* on its own will not fully manage lower operating temps
I agree. When I changed out the thermostat in my */c 97 Rivi, the temp gauge was always a few notches lower than with the stock thermostat, even at idle. All around the engine was cooler with the 180* thermostat.
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Old 01-31-2007, 09:24 PM   #19
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Default Re: thermostat?

Quote:
Originally Posted by briancole23

I have one question... am i supposed to open the housing screw while its running or turned off? I did it while it was running and anti freeze did start coming out. I alos did it once while it was turned off and it still came out. It is running at 200 degrees now and I was beginning to think that I am suposed to wait for the system to totally cool down and then do it.
I've done it both ways. OPening it slowly there'* little chance of fluid surprising you by coming out quickly after the air comes out.

You might drive it a couple of days and then bleed it again just in case an air bubble gets caught there.
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Old 01-31-2007, 10:58 PM   #20
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you have to open the bleeder screw on the housing with the car running until the fluid runs clear of air bubbles
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