quote Originally posted by Rickady88GT: I know this is not new, but I also put a high pressure rated cap on the stock Fiero radiator location. I plugged the overflow vent for the radiator to prevent the ventilation of air into the radiator during cool down. Then put a 15# cap in the engine bay to purge the system from the highest point in the cooling system o my LS4.

Any problems?

Kevin

The only problem I have had in the last 10 years is that I had a leaky water pump twice and the coolant ran low one or twice before I replaced the pump. Once the trip was so long that the engine just started to heat up because of the leak. But that is totally my fault for not replacing the pump.

Sounds good. I just cannot see how it wouldn't work.

Kevin

quote Originally posted by Lambo nut: I could understand that if the heater core had only one tube with a single inlet and outlet but they are made more like a radiator. Kevin

There is a lot of turbulence as the flow passes through the core. This results in any air being broken down into tiny air bubbles in the water/coolant. Surface tension drags the bubbles through the system.

Since mine was done, I have driven it on at least one Run For The Hills. Also drove it to Indy and back to Atlanta for the 30th - with the air conditioning on, most of the time. It never even thought about overheating.

quote Originally posted by Lambo nut: Sounds good. I just cannot see how it wouldn't work. Kevin

This is why I put off the water pump replacement, it came out all the way to do it. But in all fairness I also did a few other things too.