Change water pump on the 91 silverado

yes your car will be over heat, just go to junk yard and open thermorstar sensor of another car to replace the old one that is cheap than you buy a new one ok!

could be the lines stopped up. happends alot due to old gas tanks will have trash in the bottom of them an you let them run low to almost empty it sucks up all that trash. it will clog lines and also clog the fuel filter and or make your pump go bad. check it out.

My guess would be the same as yours. Good job.

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.

1 disconect neg.battery cable 2 drain the cooling system 3 remove air intake tube from filter housing to throttle body 4 remove top half of fan shroud 5 remove the serpentine belt 6 use a strap wrench to prevent the waterpump pulley from turning while turning the fan clutch in the counterclockwise direction. 7 remove fan and set aside 8 remove belt tensioner 9 remove hoses from water pump 10 remove 6 bolts, 3 on either side and remove the water pump. 11 remove the thermostat housing from the old pump and install on the new one. 12 re assemble in reverse order. make sure the mating surface of the engine block where the pump bolts on is clean and free of old gasket material before installing new pump and gaskets. When assembled fill cooling system, start engine and let idle untill thermostat opens and engine reaches operating temp.KEEP WATER LEVEL FULL. After a test drive recheck the coolant level, and you are done.

The O-ring should fit into a groove on the back of the water pump or it's mating surface.

If your car is over-heating, chances are it's the water pump or thermostat. These two parts should be changed out at the same time because if your pump is old enough to go out then the thermostat is not far behind.





Step1 First you'll need to pull out the old water pump. Look in your vehicles owners manual and find the diagram showing what all that stuff under your hood is. locate the water pump (usually underneath alternator running on the same belt) you'll need to take this belt (serpentine or other) off to start pulling the old pump. There should be a tension bar or arm that easily loosens the belt with the right size socket. Step2 Once you've gotten the belt off you can begin to remove the old pump. There should be only a few large bolts holding it in. After you've gotten the old pump out, place the silicone sealer on the new water pump 9around the edges where it meets the gasket. Then apply the sealer to the gasket as well, just use your fingers to spread it on. Now place the new pump with gasket, where the old one was, replace the bolts and be sure not to crank down too tight on the bolts or you might crack the gasket and your pump wont seal. Step3 Now that you've gotten the new pump installed, you'll want to replace the thermostat. the thermostat could be located near the water pump or on the other side of the engine. So once again, refer to the vehicles owners manual and find where the thermostat is. You might need to remove some hoses and/or lines to get to the thermostat, so just be careful not to break/bend/crack or damage anything (the older the vehicle, the better chance of something breaking) Pull the old thermostat and replace it with the new and you're all done. Don't forget to put everything (hoses, lines, nuts'n bolts) back where they came from and off you go!

easy job drain raditor,remove shroud remove fan,take off belt,take off hoses,remove the 4 bolts holding on the water pump scrape off old gaskets then put it all back together

you may have disturbed the crankshaft or camshaft sensor

radiator could be stopped up, fan not working properly, or t-stat sticking.