Need help bleeding coolant on 84.
Thread Starter
Intermediate
Joined: Oct 2012
Posts: 41
Likes: 0
Need help bleeding coolant on 84.
I have searched and searched with no luck. Do you just remove the cap and run it to high temp, then replace cap? Do you remove the overflow cap too, or only the overflow? I've never seen a car without a bleeder valve. Recently it has been running up to 240 before cooling back down to the 220's. I bought a 180 thermostat, but can't find a diy on that either. Can someone please tell me how to burp this damn thing? I purchased the thermostat, new radiator cap (16 lb, not 15)<----will this harm anything?
Also, would a failing thermostat cause the car to get up to 220 within two minutes after being started?
Thanks!!!
Also, would a failing thermostat cause the car to get up to 220 within two minutes after being started?
Thanks!!!
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
Remove rad cap. When the car gets close to operating temperature, have someone hold gas pedal to about 2000 rpm. When the thermostat opens the level in the rad should drop. Add coolant until full and replace cap. (50-50 anti-freeze and distilled water, as s/b initial rad fill)..
Return to idle rpm and shut motor off, then crack a cold beer.
Return to idle rpm and shut motor off, then crack a cold beer.
Thread Starter
Intermediate
Joined: Oct 2012
Posts: 41
Likes: 0
Replaced the thermostat today with a 180. Replacing the thermostat in this car sucks, so vetteman be prepared for a grueling hour or two. Someone had tightened down the thermostat housing bolts super tight and no anti seize on mine, making it nearly impossible to get off. Used a lot of PB blaster and about 30 minutes just to get them loose.
Do tighten them back really tight to prevent it from leaking. I had to tighten them more, two times to get it to stop leaking. The thermostat in it was a 195 and it had failed. I tested in a boiling pot and it never opened up, thus the reason I was running 230-240. Took it on a 30 minute drive and even in traffic only got to 187. At cruising speed it would run in 178 range. It's really nice to get it figured out and only have to spend $7 plus some coolant to get a 75 degree difference.
Although, I did sit in my $200 Costa sunglasses getting into the car. 
Do tighten them back really tight to prevent it from leaking. I had to tighten them more, two times to get it to stop leaking. The thermostat in it was a 195 and it had failed. I tested in a boiling pot and it never opened up, thus the reason I was running 230-240. Took it on a 30 minute drive and even in traffic only got to 187. At cruising speed it would run in 178 range. It's really nice to get it figured out and only have to spend $7 plus some coolant to get a 75 degree difference.
Although, I did sit in my $200 Costa sunglasses getting into the car.
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Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
^^You guys are making more out of it than it is in a Crossfire......those guys with L98 or LTx may have "burping" issues but the Crossfire is a Small Block Chevy.......
What you are over looking is that your thermostat may cycle open and close 3-4 times.....so....let it run....and when it warms up you'll see the level drop. Fill it.....
When you fill it, cold water will hit the thermo again and it will close....wait
You see it drop again, refill, wait.....
When you see that whole system running at about 200° F, and you don't see anymore drops in level, replace the cap and drive off into the sunset.
People have the hardest time understanding that the water in the radiator is COLD....so when the Thermo opens.....it gets hit with cold water and it shuts...you have to wait for this process to take place a few times before the radiator is warmed up as well.
Burping....I'm not sure what those L98 boys are talking about.....
What you are over looking is that your thermostat may cycle open and close 3-4 times.....so....let it run....and when it warms up you'll see the level drop. Fill it.....
When you fill it, cold water will hit the thermo again and it will close....wait
You see it drop again, refill, wait.....
When you see that whole system running at about 200° F, and you don't see anymore drops in level, replace the cap and drive off into the sunset.
People have the hardest time understanding that the water in the radiator is COLD....so when the Thermo opens.....it gets hit with cold water and it shuts...you have to wait for this process to take place a few times before the radiator is warmed up as well.
Burping....I'm not sure what those L98 boys are talking about.....