Having problems with your 2001 Pontiac Montana ?

How do you change water pump on 2001 pontiac montana

Posted / edited by AnonymousUser on : 21-01-2019

Answers :

This goes for all GM 3.1 and 3.4 engines
\012do not work on a hot engine!
\012Please be careful not to spill the antifreeze that comes out and dispose of the old antifreeze properly. The environment, your kids, your pets, your neighbors, and I would appreciate it.
\012Locate water pump on passenger side of vehicle toward the front near the top of the engine. It has a smooth pulley on it. There is usually a plastic cover right above the pulley that has the belt diagram on it. Remove the cover by taking out the 8mm bolt that holds it on from the side. If there is no belt diagram, grab your kid's crayons and construction paper and make a drawing to help you when it's time to install the belt. I like using different colors for each pulley, to add some flair to my artwork. Pen or pencil and regular paper work too.
\012Pinch off or remove the overflow tube at the radiator(you want to prevent the spilling out of the contents of the overflow resivoir). Remove the radiator cap. Drain the coolant (into an appropriate vessel) by opening the drain on the radiator. On the Montana, the drain is towards the bottom of the radiator on the driver side. Once the radiator is drained, close the drain!
\012Don't remove belt yet, Keeping the belt on first helps to keep tension on the pulley to help loosen bolts. Loosen the 4 10mm bolts that hold the pulley onto the pump. Don't remove the bolts yet, only get them loose. If you remove the bolts before removing the belt, the tension on the belt can cause injury. Once loose, remove the serpentine belt by releasing the tension from the tension pulley.
\012Now you can remove the pulley bolts. Remove the pulley, sometimes they get stuck on the pump, but a little careful prying can overcome that. Now that the pulley is off, you will have access to the 8mm bolts that hold the pump onto the housing. Make sure you have a drain pan under where you are working on the pump.
\012Remove the bolts holding the pump(if I recall correctly, there are 5 of them(there may be 6)(look at the new water pump as a guide)).
\012once all the bolts are out, remove the pump from the housing. I personally find that gentle persuasion with a hammer to the steel flange that the pulley bolts to is the easiest way to break the seal and free the pump from the housing. Once the pump is removed, clean the mounting surface on the housing to remove all old gasket material.
\012Take new pump and gasket and find the proper alignment of the bolt holes. This may take a minute and if you can't get the holes to all line up, flip the gasket over.
\012To help with installation of new pump and gasket, I put a very small amount of permatex 2(you can use other types of gasket materials, but that is my personal preference for this application) between the pump and gasket only at the mating surfaces.
\012Now, align pump on housing so that all the bolt holes line up(this is where having the gasket already stuck to the pump helps)(you are welcome)
\012install the pump bolts and tighten down. I make them fairly hand tight using a 1/4 inch ratchet(I don't know exact specs, but I've been doing this for 20 years) if you are unsure, reference proper torque specs.
\012align pulley onto pump and install bolts, snug them down(you will re-visit them in just a moment). Install belt using the factory diagram (or the one you made ??) as a guide.
\012With the belt on, tighten the bolts that hold the pulley onto the pump. Reattach the little plastic cover.
\012Bleed out the air from the cooling system. These cooling systems royally stink ??when it comes to getting all the air out. I use a vacuum based system to remove all the air and fill the system with antifreeze.
\012if you need to, reference service procedures for proper filling of cooling system.
I think this one is on the bottom and might require going underneath the vehicle. Remove belt first, drain coolant then I always buy the new one next. That way you can see where the mounting bolts are. Remove bolts and pump assembly.
use a hi temp sealer on the gasket both sides to prevent leaks. Replace bolts then fill with some new coolant. Don't forget to bleed the system when it is hot. Myself I replace thermostat at the same time so I don't have to go back later and open the hood again.
Repair Help & Product Troubleshooting for 2001 Pontiac Montana

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