how can i check water pump to make sure it's ok

Asked by Feb 29, 2012 at 06:48 PM about the 1993 Mitsubishi Mighty Max Pickup 2 Dr STD Standard Cab SB

Question type: Maintenance & Repair

removed and gutted old stat and reinstalled but left radiator hose off stat housing but still connected to top of radiator. duck taped a garden hose into loose hose and turned water on.
water flew through radiator, water pump, and engine and out of the stat housing. it appears there's no blockages. next i disconnected the hose at bottom of radiator and stuck the loose end in a container of water with the garden hose in it and ON (to keep it full) and the other end of the radiator hose still connected to the water pump.  i  then started engine to see if water pump would pull the water out of the container and pump it through the engine but it
didn't pump a drop. i checked and made sure the radiator hose in the container was free and able to suck water . what am i missing here?   the water pump didn't make noise or wobble but i removed it anyway and on a mighty max that's no fun. it looks like a 3 year old water pump alright but there's no shaft play or stoppage and the impeller turns with the shaft. yes,
the engine still overheated after i gutted the stat which left about a one inch diameter opening.
Anyone got a thought about this?  It's been a pain. sorry about the drawn-out story. richard

4 Answers


the only way i can think of to check a water pump, is to just put it together, and drive it around the yard or something. if it shows signs of oerheating, shut it off, and order a new one. i know that the water pump is a pain to remove, but if you just pull the fan off first, then loosen your belt, and then try to remove the water pump, it should be a little easier... good luck...

1 people found this helpful.

if you have it off see if there is any wobble or shaft play on the pully shaft! if it is still on a runny motir let it run awhile and shut it off 9/10 your coolent will leak on the or around the water pump

1 people found this helpful.

You must have a functional thermostat, this allows for the fluid to interchange at intervals with the fluid in the radiator. If there's no thermostat to create a delay then all of your fluid is at the same temperature inside the radiator and in the block, hot.

1 people found this helpful.

If you removed the water pump and inspected it i would be looking at other possible causes of overheating. Possible head gasket?

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