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Re: 91 Mustang GT running Hot
Does the fan come on when supposed to? you could hook your fans to a toggle switch and run them manually from start to finish this may help. also did you bleed the system after replacing these parts and purge all air from cooling system? is the coolant coming out of the resovoir hose?
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If you have a viscous fan hub then have it replaced as it is not moving the air through the radiator. Check how you placed the thermostat in the system as the bulb bit faces into the head or block so that it can sense the rising water temperature and open as required.. With not water moving through the hose I suspect that may be your problem
The only item left that controls the flow of the coolant is the thermostat.
It is and usually replaced with the water pump or radiator because it is an
inexpensive part. The thermostat blocks the flow of coolant until the vehicle
warms up to the thermostats specified temperate recommended by the vehicle manufacture
then opens to allow flow of coolant.
seems to me that you could have an air lock, try loosening the rad cap slightly and run car until fans kicks in, squeeze upper rad hose a few times to push any air out. Careful with hot hoses. see if this helps.
You can tell if your water pump is running backwards by the way the radiator fan is running. If the ran is pulling air from the radiator then the water pump is running the right way, if it's pushing air toward the radiator then your water pump is running the wrong way too. There should be a sticker on the fan shroud or on the hood to the direction the serpentine belt should run. IF the water pump is running the right direction, then it needs to be replaced. Good luck and hope this helps.
leave the radiator cap off till it reaches operating temperture,check for bubbles in coolant,if you have bubbles [bad head gasket] or check for the coolant curculating,if not curculating [stuck closed thermasat or plugged radiator
check to see if you can spin the fanwhile the engine is cool it should spin freely,if it doesnt fan clutch,also I would switch the fan back to oringinal just to test if this is the problem,if it is youll have to design a different fan shroud if you want to use you new fan,if everything done above is ok with the engine cool take off the radiator cap and squeeze the bottom hose 4-5 times in burst this will make sure you dont have air in the system,if this is helpfull please vote me a fix ya