Quote:
Originally Posted by saumil
I still am puzzled. Because no matter which direction the fluid flows, if the monovalve is closed, the scenario with respect to hot water in the heater core is still a normal scenario, and normally we dont get hit by 90-100degF air when RPMs increase. So what is happening at high RPMs to cause the air to turn hot ?
|
Makes sense to me. The monovalve is leaking, letting coolant flow when it should not. It's getting pressure from the engine's coolant pump, which is belt-driven, and increases flow at higher RPM. So when RPM's increase, it pushes coolant into the heater core, and voila... hot air at the vent. I'm nearly certain that a new monovalve will cure this. BTW, I would NOT convert to some other type of valve... these rarely fail on a W124 (this is maybe the second I've heard of). I'd just get a new (or used) one.
