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63corvette · 07-09-2008, 03:23 PM

I had exactly the same problem some years ago. The only way I took care of it was to install a vent on the very top of the radiator and a small braided steel line 1/8 inch from the radiator next to the vent back to the CSR filler neck on the manifold. Vent the radiator as you fill the radiator and then again after you run the pump for a few minutes. Turn the water pump off before venting as the pump can pull air back in.
I think the 1/8 inch vent line basically kept the system from air locking. I think that was my problem as sometime it would run cool and other times it would heat and blow out water. I never had the problem after doing both things. You might try one at a time. One might fix it.
Good Luck With The Issue

07-09-2008, 03:23 PM	#6
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 551 Likes: 127 Liked 353 Times in 102 Posts	Re: Air in cooling system I had exactly the same problem some years ago. The only way I took care of it was to install a vent on the very top of the radiator and a small braided steel line 1/8 inch from the radiator next to the vent back to the CSR filler neck on the manifold. Vent the radiator as you fill the radiator and then again after you run the pump for a few minutes. Turn the water pump off before venting as the pump can pull air back in. I think the 1/8 inch vent line basically kept the system from air locking. I think that was my problem as sometime it would run cool and other times it would heat and blow out water. I never had the problem after doing both things. You might try one at a time. One might fix it. Good Luck With The Issue