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Re: Question about water pump tests
The water pump sucks from the lower hose, so it will be cooler than the upper hose. If it isn't, then you have a radiator or coolant flow problem.
A blown headgasket can cause the cooling system to pressurize very quickly, in a matter of seconds after you start the car. If you have exhaust smoking out of the rad then obviously you have blown a headgasket and need to replace it otherwise it will overheat no matter the cooling system.
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