OZNAD said:
Not to jack the thread, but with the renix how do you get the air out? i already replaced the bottle and cant find any other leaks, so i am thinking there must be air trapped in the system?
Yea, it's a hijack, BUT:
1.) I've yet to read what year the OP is driving. If it's a RENIX then this is relevant.
2.) To alleviate the air-in-system problem, take out the thermostat, drill a 1/16" (1/8"?)hole in the thermostat at top and bottom (AKA 12 o'clock and 6 o'clock of the face of the t-stat, not the edge). Re-install the thermostat. This effectively burps the RENIX closed system. Drive fill, drive.
3.) A properly working thermostat only regulates MINIMUM temp. Unless it's stuck closed or partially closed (unlikely) the thermostat is not the problem.
4.) X2 on the 16 lb cap but that won't work on a RENIX (no radiator cap) and a non-RENIX will burp itself in normal driving. Monitor your overflow bottle after every trip, even to the store.
5.) A pressure bottle is not an overflow bottle, it'd be easier to diagnose if we knew what you were driving, please include in your post. If I missed that, Im sorry.
5.) On my 90 (RENIX) I had a
pinhole leak that was only evident when it was hot and running. When I turned the engine off the pressure would dissipate quickly and the stream of coolant went away. There was some coolant in the engine bay but not on the ground. After replacing 2 coolant bottles (cheapies admittedly) I converted it to an open system in aggravation.
...and finally,
if you're overheating at a light or in traffic or wheeling at slow pace it's more likely your fan clutch OR your aux. electric fan.
...and then there's always the possibility of a head gasket failure...but we won't go there on this post since I have no experience with mine on this. So that's all I got.
eace: