Vonrottes
Active Member
- Joined
- Oct 29, 2020
- Messages
- 63
- Reaction score
- 101
- Points
- 33
- Age
- 31
- Location
- Columbus, ohio
- Members Ride
- 2009 Pontiac G8 GT
This last week has been nothing but me trying to figure out the cooling system.
2020 I replaced the radiator with a store brand or style. And its been fine since.
2021 I replaced the cap and thermostat with the same store brand and fought overheating until I replaced both with OEM parts straight from the Chevrolet dealership. And its been fine since. Usually sitting around 98c.
After the cam swap it's been wonky. Reaching 106c in traffic and then dropping down to 97c once the fan kicks on. Run with the AC on and it stays 96-97c. Did a flush yesterday and checked the thermostat to see if any crud left over from cleaning the block made it into the coolant passages. After the flush I had a steady stream of bubbles from the steam vent on start up.. continued my normal bleed process and still had a steady stream of bubbles. Today I did a pressure test on the system.
Installed the gauge and started it up, no pressure built in the system. Pressurized the system to 20psi and it held for an hour. Started it back up and no bubbles... To be clear there have been NO other signs of a blown head gasket... Calling it good for now and I'm going to keep an eye on it.
This weekend is a pretty big local "Holden" meet at a nearby shop and I'm hoping to throw it on the Dyno of I can get the timing sorted before Saturday
2020 I replaced the radiator with a store brand or style. And its been fine since.
2021 I replaced the cap and thermostat with the same store brand and fought overheating until I replaced both with OEM parts straight from the Chevrolet dealership. And its been fine since. Usually sitting around 98c.
After the cam swap it's been wonky. Reaching 106c in traffic and then dropping down to 97c once the fan kicks on. Run with the AC on and it stays 96-97c. Did a flush yesterday and checked the thermostat to see if any crud left over from cleaning the block made it into the coolant passages. After the flush I had a steady stream of bubbles from the steam vent on start up.. continued my normal bleed process and still had a steady stream of bubbles. Today I did a pressure test on the system.
Installed the gauge and started it up, no pressure built in the system. Pressurized the system to 20psi and it held for an hour. Started it back up and no bubbles... To be clear there have been NO other signs of a blown head gasket... Calling it good for now and I'm going to keep an eye on it.
This weekend is a pretty big local "Holden" meet at a nearby shop and I'm hoping to throw it on the Dyno of I can get the timing sorted before Saturday