Air in the cooling system
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Super Moderator
Joined: Jul 2006
Posts: 2,328
From: Dickson, TN.
Air in the cooling system
On my '87 L98 coupe I have air in the cooling system. is there any way to remove it other than running it till it's warm and waitiung for it to cool then adding coolent as the air comes to the radiater? is there any kind of air bleeder in the system? if not where might be a good place to install one? any sugestions will be greatly appreciated. Cheers
Joined: Sep 2005
Posts: 406
RE: Air in the cooling system
The LT1s have a bleeder in the throttle body. If you were to do one i would probably put it there, except that i have bypassed the coolant to the TB. That is the only way i know to burp the coolant system. You might have some luck by squeezing the upper radiator hose until you can feel it full of water.
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Super Moderator
Joined: Jul 2006
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From: Dickson, TN.
RE: Air in the cooling system
Any way you could post a picture of the bleeder? I tried the hose squeezing thing. It helps some but can't get it all out. I appreciate your replies.
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Joined: Jan 2006
Posts: 1,858
From: Lumberton, Texas
RE: Air in the cooling system
L98's have no bleeder, shouldn't need one. Never had to bleed mine (86 L98). Are you getting bubbles on a warmed up engine? Hope not, that could mean headgasket. [
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Super Moderator
Joined: Jul 2006
Posts: 2,328
From: Dickson, TN.
RE: Air in the cooling system
I don't think so. But I'll certainly check into it. How warm would it have to be for that to show up?i know for sure there is no water in the oil. I believe there is the smallest of leaks in the radiater or heater core. not enough to cause an actual drip or puddle but some times I can smell coolant. I just can't seem to get all the air out.
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Joined: Jan 2006
Posts: 1,858
From: Lumberton, Texas
RE: Air in the cooling system
Headgaskets can leak into the combustion into coolant passages and never show up in oil since it is bleeding compression. Might need to have someone run a combustion gas test on your coolant system. Temps can vary on leaks, so you might need to get it checked. If you are smelling antifreeze in the cab, it is more than likely the heater core. [8D]
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Joined: Sep 2006
Posts: 103
RE: Air in the cooling system
If your cooling system does not have a bleeder screw/valve, the systemcan easily be bled by doing the following:
1. Let the car cool down for a few hours if driven recently. It is best to start with a cool/cold motor.
2. Remove radiator cap - not the recovery tank cap.
3. Start engine and let it reachnormal operating temperature. As the thermostat begins to open, air in the system will begin to bleed itself out.After the thermostat opens, all the air should bleed out within 5 minutes. At this point, water may be burbling out of the radiator. If the water level is low, slowly add water or anti-freeze to the system to top it off.
4. Replace radiator cap.
5. Top off recovery tank to proper level.
CG
1. Let the car cool down for a few hours if driven recently. It is best to start with a cool/cold motor.
2. Remove radiator cap - not the recovery tank cap.
3. Start engine and let it reachnormal operating temperature. As the thermostat begins to open, air in the system will begin to bleed itself out.After the thermostat opens, all the air should bleed out within 5 minutes. At this point, water may be burbling out of the radiator. If the water level is low, slowly add water or anti-freeze to the system to top it off.
4. Replace radiator cap.
5. Top off recovery tank to proper level.
CG
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