Titan owner: I have a 08 titan SE flex fuel, and it just started to blow coolant out of the radiator cap started when the heater valve went out. Has anyone had this issue? Help, please!
Intelligent Tinkering: The coolant is supposed to be pressurized. The usual reason a radiator cap blows coolant is because the radiator cap fails and releases the pressure. The overflow may be blocked or crimped or even frozen (if you live in a cold state and your coolant isn't to spec). There isn't a way for the heater valve to pressurize the cooling system. All it does is allow hot coolant into the cab's heat exchanger when opened. I would just switch out the cap. But I'd check that the overflow pipe is clear first. Just take the cap off (when the engine is cool) and see if you can blow some compressed air through there. Not full pressure. About 20 PSI is enough. I also remember a case when one of my students put water not coolant in their overflow tank and it froze and blocked the pipe.
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