as winter started here in PA I had to replace the coolant assembly that sits on the firewall due to severe rust. Now I appear to have a leak at the reservoir. Im thinking that its coming from the pressurized cap. When I turn off the car I can actually here what sounds like a boiling water sound from the engine if its hot enough. The temp gauge will suddenly jump from nothing to normal temp after I've been driving it for 10-15 mins. I'm wondering if I either have air in the system, a bad cap, a bad thermostat or a bad head gasket. Are there any other possibilities and how should I go about eliminating them while troubleshooting this problem?
Last edited by noblebrown; 01-21-2013 at 11:28 AM.