"Burping" the LT5 after a coolant change? - ZR-1 Net Registry Forums

Bell Curve · 08-17-2005

During a thread about which coolant to use (Red or Green), someone mentioned "burping" the engine afterward. A reply came that I copied below;

Take a large asprin or any drug in tablet form, pry the thermostat open and use the pill to hold it open. The pill will dissolve, but not before you fill the car without any air gaps, no need to burp it and it won't harm anything.

Whatever you do, don't use the orange crap, it will corrode the system.

I wanted to hear opinions on it and "burping" in general?

Bell Curve · 08-19-2005

So is burping a myth or what?

We Gone · 08-19-2005

Hereâ€™s my theory on it. After draining the system refill start up and let run with cap off until the thermostat opens. Add more if necessary. Step two (be very careful as the coolant is hot and you can make a mess) have someone with a very steady foot raise the rpms slowly as they do the level will drop.

Fill to top and put the cap on fast while the rpms are up. (Note if you back off the rpms with the top off it will overflow. I call this packing the system.

Never had any air issues after doing this.

ZR1 MK · 08-19-2005

Theoretically the system is self bleeding, but you should try to get as much air out during the coolant change process. Check the high fill at a later time and you will see how good you did as thats where all the air will collect.

Kevin · 08-19-2005

I just had to drain my system. Just filled it and went. No problems at all.

Nick · 08-22-2005

I've done the simple drain, refill, and go, as well as the service manual procedure. No difference noted on my car.

08-17-2005	#1
Bell Curve Join Date: Aug 2005 Location: Pineridge Posts: 341	"Burping" the LT5 after a coolant change? During a thread about which coolant to use (Red or Green), someone mentioned "burping" the engine afterward. A reply came that I copied below; Take a large asprin or any drug in tablet form, pry the thermostat open and use the pill to hold it open. The pill will dissolve, but not before you fill the car without any air gaps, no need to burp it and it won't harm anything. Whatever you do, don't use the orange crap, it will corrode the system. I wanted to hear opinions on it and "burping" in general?

08-19-2005	#3
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,162	Hereâ€™s my theory on it. After draining the system refill start up and let run with cap off until the thermostat opens. Add more if necessary. Step two (be very careful as the coolant is hot and you can make a mess) have someone with a very steady foot raise the rpms slowly as they do the level will drop. Fill to top and put the cap on fast while the rpms are up. (Note if you back off the rpms with the top off it will overflow. I call this packing the system. Never had any air issues after doing this. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

08-19-2005	#4
ZR1 MK Join Date: Aug 2005 Location: NY Posts: 143	Theoretically the system is self bleeding, but you should try to get as much air out during the coolant change process. Check the high fill at a later time and you will see how good you did as thats where all the air will collect. __________________ Mike 427 cu in LT5 [URL="http://zr1mk.weebly.com"]http://zr1mk.weebly.com[/URL]

08-19-2005	#5
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,633	I just had to drain my system. Just filled it and went. No problems at all. __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

08-22-2005	#6
Nick Join Date: Jul 2005 Location: Auburn, Washington Posts: 586	I've done the simple drain, refill, and go, as well as the service manual procedure. No difference noted on my car. __________________ Nick ZR-1 Net Registry Founding Member #32 - lapsed...