Alright, I have an '04 GC with the 4.7 and about 107K miles. When I bought it, the dealer said that it had an all-new bottom end due to a "noise" that it still has - probably either a timing chain tensioner or a valve "lifter" guide. Anyway, it has about 50 psi pressure.
So, it has air in the coolant system - when I start it when cold you can hear water rushing in the heater core. It "overheated" once when an air pocket hit the thermostat housing, but didn't go above 250, and was allowed to cool before hitting the "red" zone.
I've added coolant to both the bleeder screw and the radiator, as well as the overflow tank.
I've replaced the radiator cap.
The concern is this - it isn't sucking coolant from the overflow, and when it's cold and you remove the rad cap, it has pressure in the system. The rad cap is cold, regardless of engine temp. According to the factory temp gauge though, it never goes above 210, and hangs out below the 210 line (but barely - 205ish).
Generally, it runs fine, doesn't show any coolant in the oil or oil in the coolant, keeps temperature and oil pressure, and doesn't show erratic driving. It did stall once, but that was after I swapped from 92 octane to 87 on an empty (like .5 gallons left) tank. When cold, the exhaust smells like exhaust, not like antifreeze.
So, should I run a coolant CO test, or forget about it until it shows some noticeable issue? I'm worried about head gaskets, but I'm always anal about this kind of stuff.
So, it has air in the coolant system - when I start it when cold you can hear water rushing in the heater core. It "overheated" once when an air pocket hit the thermostat housing, but didn't go above 250, and was allowed to cool before hitting the "red" zone.
I've added coolant to both the bleeder screw and the radiator, as well as the overflow tank.
I've replaced the radiator cap.
The concern is this - it isn't sucking coolant from the overflow, and when it's cold and you remove the rad cap, it has pressure in the system. The rad cap is cold, regardless of engine temp. According to the factory temp gauge though, it never goes above 210, and hangs out below the 210 line (but barely - 205ish).
Generally, it runs fine, doesn't show any coolant in the oil or oil in the coolant, keeps temperature and oil pressure, and doesn't show erratic driving. It did stall once, but that was after I swapped from 92 octane to 87 on an empty (like .5 gallons left) tank. When cold, the exhaust smells like exhaust, not like antifreeze.
So, should I run a coolant CO test, or forget about it until it shows some noticeable issue? I'm worried about head gaskets, but I'm always anal about this kind of stuff.