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Jan 21st, 2020
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 Not a Chevy question.
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Joined: Mar 2004
Posts: 273
OP
Shop Shark
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I have a 1989 Jeep Comanche. It doesn't have a radiator cap. It has a pressure bottle on the firewall. When you drain the coolant you have to burp the system. Have any of you encountered such a thing? I am putting in a radiator with a cap and an overflow bottle this weekend. Hopefully, it will burp its self.
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Re: Not a Chevy question.
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Joined: Mar 2010
Posts: 9,485
Master Gabster
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I had a 90 Cherokee. That engine will not burp itself.
You are supposed to fill the reservoir,
bring the engine up to temperature,
shut it off and allow it to cool.
"Wash, rinse, repeat" as many times as necessary until the reservoir no longer lowers after it cools down.
Then you keep your finger crossed that it is right.
I almost blew mine up not knowing this.
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Re: Not a Chevy question.
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Joined: Feb 2004
Posts: 21,647
Boltergeist
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Most engines with part of the cooling system above the top of the radiator will have a bleeder screw that can be opened while filling the system. If not, find the highest hose connection and disconnect it while filling to allow the trapped air to be displaced.
Jerry
The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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Re: Not a Chevy question.
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Joined: Feb 2001
Posts: 6,889
Master Gabster
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I have heard of running up on blocks while filling or at least get the nose uphill.
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Re: Not a Chevy question.
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Joined: Oct 2005
Posts: 3,097
"Hey! I sound like Darth Vader!!
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They do make a cooling system burping tool.
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