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Originally Posted by riverat440
Allowing air in a sealed system will cause coolant to boil at a lower temperature. The purpose of a sealed system is to allow pressure to build and thus raise the boiling point of the coolant. If your heater doesn't heat at an idle it may be clogged and in need of a flush. The water pump isn't a positive displacement pump so at a lower RPM it may not overcome a partial clog. The shroud is supposed to help direct the air flow, if it isn't there the fan will pull air from the place of less resistance-on the engine side. With the shroud in place it helps the fan pull air through the radiator. The purpose of the fan clutch is to engage the fan when the coolant-radiator starts reaching a moderatly warm temperature and disengage when it is not needed. If the clutch is bad the fan will not engage when it is needed and cause higher engine temperature.
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This is AwPhuch..I figured out what the problem was that the truck had sat for over a year in a parkinglot without being run
The fuel pump had pitted and the tolerance of the pump frame to the splines had gotten so bad that if the engine wasnt running at higher than idle rpm it wasnt pushing water, and the thermostat was spit in two (the guts were sitting on the inside of the intake manifold)
Once I replaced the water pump, and the thermostat, and the fan clutch not overheat problems whatsoever...I also recommend pulling the powersteering pump housing and replacing the small hose from the intake manifold to the water pump, mine was all stretched and was about to blow anytime!