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Water Pump, Do it myself or pay someone? - Toyota Yaris Forums

Water Pump Question

My WP has the inevitable pink stuff spewing from it. I'm torn between paying a shop $175 to change it (labor only) or doing it myself for $75 (paying a young mechanic to help me do it in my garage). What would you recommend? I've changed waterpumps before, but not on a car this new. I've got all the tools and have worked on cars when I was young(er). I'm tempted to do it myself as much for the fun of it as for the savings. Here are my concerns:

Do I really have to lower the engine (loosen a motor mount) to get the old pump out?

Do I need to worry about air pockets in the cooling system when I refill it?

What's your opinion? and are there other things I should be concerned about. I'll probably by the OEM WP online.

That's my story. Thanks for suggestions in advance.

Replies and Advice

If you have changed water pumps before, why are you asking these questions ? I think you should put the tools down and have a professional ASE mechanic do it.

Correct tools are a must and several variations of the same tool was required for me. In other words a good tool selection made it a whole lot easier.

Engine lower....... no

Bubbles.......... yes (re-fill slowly and burb several times)

This should be an extremely easy job.

DIY all the way.

The air bubble stuff is not a problem. Just fill and run and cool and check until its full.

Removing the alternator makes it easier to access. Make sure you get a good gasket with the pump.

The 3 bolts that hold the pulley to the shaft are 10mm. You need a wrench (not a socket) to remove these bolts as well as having to lock the pulley. I used a large screwdriver through one of the holes in the pulley.

There are 3 bolts and two nuts that hold on the water pump. These are also 10mm. You will need a combination of wrench and socket to get these off.

The top bolt on the alternator is 12mm. The bottom bolt on the alternator is 14mm. A wrench works fine for both. To get to lower bolt out all the way so you can remove the alternator, you need to remove one 10mm bolt that holds an AC line in place. Remove the bolt, and wiggle the bracket up the ac line (toward the front of the car) a couple of inches so it is not in the way of removing the lower alternator bolt. It is a long bolt.

Start to finish, about 3 hours but there was a lot of coffee sipping.

Even though you drained the radiator, when you remove the pump, there will be a substantial amount of coolant that comes out. Put some cardboard on the floor with some kind of catch pan. I used a plastic 1lb coffee container. Besides what made it to the floor (cardboard), I caught 6 ~ 8 oz of fluid in the container.

It is not difficult. Well.. it is not like hauling rocks in a wheel barrel for three hours but it is kind of a pain.

Your post was super helpful. I'm pretty confident I can handle it, thanks to your detailed suggestions.

I see you've had to replace several water pumps on the Yaris in a short time. Out of curiosity, what brand were you using? I'm thinking of just getting one from Autozone that has their lifetime warranty, or I could get an OEM online, but I think those have problems and don't have much of a warranty. Please let me know what you think.

My 1st replacement was a genuine OEM toyota pump. this pump never leaked but the shaft began to wobble and it was making all kinds of noise.

The 2nd OEM pump lasted till 73k. So I am figuring that the oem pump is good for only about 35k+ miles. The last pump, I got at autozone for 1/2 the oem price. The gasket that comes with it was a POS.. just a piece of paper. However, that pump leaked from the get go. They gave me a replacement of the same type and that one is not leaking.

BMG is the maker if the pump I think.

Why so many pumps go bad so soon? I have 130k miles on my 07 and still on oem pump.

Dont worry you got one of the good ones. I bet your pump lasts forever. But do what I do. Open the engine hood once a month or once a week and look at the bottom of it. When the pump starts to go you will see red streaks of coolant in line with the belts. Mine leaked for a month before I had the dealer replace it under warranty at 26k miles. But the coolant level never went down any. Maybe it would just leak a little and never actually let go. I remember old time water pumps in the 60s. Once they leaked a bit that was it. They were gone in a week or two. I do not think your Toyota pump will go and blow right away. There will be time to do something.

My first factory installed pump went at 30k. I installed an OEM replacement, and 1k later, it too was spritzing! BUT, I let it ride and it "fixed" itself after a while, like MONTHS later. Go figure. I let it be and it's fine now at 47k. And yeah, order the proper black metal gasket from the Toyo dealer.

OEM pumps are made by Aisin. We have had VERY mixed luck with the Aisin WP's. We replace a LOT of them (on multiple models). some last 30k. some last forever. must be a issue in manufacturing tolerances or something.

FWIW, our 08 yaris has 65k ish miles on it and is leak free on the original pump

90,700 miles....no water pump issues.