Water Pump PLUS??
Thread Starter
Intermediate
Joined: Jun 2016
Posts: 33
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Water Pump PLUS??
Had back surgery four weeks ago and can't get under so having someone I trust help out. I ordered AC Delco 252-846 water pump which needs to be changed. What else should I go ahead and have replaced while doing this? Do I absolutely need to go ahead and replace thermostat? Anyone have exact OEM part # for that? Anything else? Thanks.
Pro
Joined: Aug 2010
Posts: 593
Likes: 9
From: San Antonio Texas
Hope your surgery went well and you are recovering well. I would suggest replacing the T-stat, timing chain and gasket, belts and possibly the tensioner and belt pullies if they have even the slightest resistance or noise. And I would flush the cooling system and clean the radiator thoroughly. I'm sure I've forgotten something and having said what I have it is VERY easy for me to spend your money from here. Have a look at the parts and make a judgment about condition. Good luck and speedy recovery.
Thread Starter
Intermediate
Joined: Jun 2016
Posts: 33
Likes: 0
Hope your surgery went well and you are recovering well. I would suggest replacing the T-stat, timing chain and gasket, belts and possibly the tensioner and belt pullies if they have even the slightest resistance or noise. And I would flush the cooling system and clean the radiator thoroughly. I'm sure I've forgotten something and having said what I have it is VERY easy for me to spend your money from here. Have a look at the parts and make a judgment about condition. Good luck and speedy recovery.
Anyone know the ideal OEM or better thermostat? I think this is what I need ACDelco 12T121D, RIGHT?
And do I REALLY need this: ACDelco 15-11057 GM Original Equipment Engine Coolant Thermostat Water Inlet Assembly
Last edited by Artizan; Oct 21, 2016 at 09:45 PM.
Melting Slicks
Joined: Mar 2012
Posts: 2,800
Likes: 456
From: USA
Originally Posted by Paul Wood View Post
Hope your surgery went well and you are recovering well. I would suggest replacing the T-stat, timing chain and gasket, belts and possibly the tensioner and belt pullies if they have even the slightest resistance or noise. And I would flush the cooling system and clean the radiator thoroughly. I'm sure I've forgotten something and having said what I have it is VERY easy for me to spend your money from here. Have a look at the parts and make a judgment about condition. Good luck and speedy recovery.
I would also consider the balancer if it shows signs of wobble. Oil pump, if changing the timing chain. This is a lot of work and money and only you can make that decision.
This is the part number for the thermostat I used on my 2001 AC Delco 15-10412.
Good luck with your repair.
Hope your surgery went well and you are recovering well. I would suggest replacing the T-stat, timing chain and gasket, belts and possibly the tensioner and belt pullies if they have even the slightest resistance or noise. And I would flush the cooling system and clean the radiator thoroughly. I'm sure I've forgotten something and having said what I have it is VERY easy for me to spend your money from here. Have a look at the parts and make a judgment about condition. Good luck and speedy recovery.
I would also consider the balancer if it shows signs of wobble. Oil pump, if changing the timing chain. This is a lot of work and money and only you can make that decision.
This is the part number for the thermostat I used on my 2001 AC Delco 15-10412.
Good luck with your repair.
Last edited by zachaeous; Oct 21, 2016 at 09:52 PM.
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 532
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
Had L4/L5 a few years ago. Still not fun bending over working on the car. No way you want to do that water pump on your own. Good thing you've got someone to do this for ya.
Probably not something I'd hold out for any particular brand, but can't fault you wanting delco parts.
Ya know, most will probably say no, but I have to tell ya, I pulled my water pump and replaced it FOR that part. Didn't realize it was the issue, but the thing had like grown crystals under the hose and THAT was what was leaking. Who'da guessed. I already had the new pump in hand and figured with 100k miles, just install it. But cleaning that part off is what made the leak stop. After a year and a half it did it again. Then I put a new one on. I can't say it's stopped cause I simply have not had enough time with the car together to know. But it was sorta corroded from those crystals. It was like salt crystals growing in there but they actually pushed the hose far enough away to make it leak. Same thing happened on my truck. Who knew. 
Anyone know the ideal OEM or better thermostat? I think this is what I need ACDelco 12T121D, RIGHT?
And do I REALLY need this: ACDelco 15-11057 GM Original Equipment Engine Coolant Thermostat Water Inlet Assembly
Team Owner
Joined: May 2001
Posts: 87,404
Likes: 1,595
From: Western NY
Hope your surgery went well and you are recovering well. I would suggest replacing the T-stat, timing chain and gasket, belts and possibly the tensioner and belt pullies if they have even the slightest resistance or noise. And I would flush the cooling system and clean the radiator thoroughly. I'm sure I've forgotten something and having said what I have it is VERY easy for me to spend your money from here. Have a look at the parts and make a judgment about condition. Good luck and speedy recovery.
Accessing the timing chain is a LOT of work, not something you'd do "just because". This ain't no "good old small block Chevy in a C-3 chassis" you're talking about!!
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 532
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
^^^ I saw that too but didn't bother to point it out. I'm pretty sure our disabled OP isn't gonna be dropping the cradle, pulling the balancer, removing the steering rack and removing the front cover just for chit and giggles. Might be adding 12 hours to the water pump job. 
Team Owner
Joined: May 2001
Posts: 87,404
Likes: 1,595
From: Western NY
^^^ I saw that too but didn't bother to point it out. I'm pretty sure our disabled OP isn't gonna be dropping the cradle, pulling the balancer, removing the steering rack and removing the front cover just for chit and giggles. Might be adding 12 hours to the water pump job.
Since I'm retired, therefore have time on my hands, when I heard about the potential issues with the "wobbly balancers", I immediately said, "Not on my car"!
So, I bought an ATI balancer, and their pinning kit. At that point, yeah, I also thought "while I'm in there", but having the rack out, and the balancer off, was 60% of the battle. So yes, I pulled the water pump and front cover off, then the oil pump, and replaced the timing chain. I will say this, though, the work room is a little cramped, so even the water pump removal wasn't a 5 minute job, like it would be on an older Chevy......
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Team Owner
Joined: Dec 1999
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The OP didn't mention the year or the mileage of his car, but I would suggest replacing both radiator hoses. Also inspect the hoses that attach to the pressure tank to make sure they are in good shape. Also inspect the radiator and A/C condensor for dirt and debris. Check the pressure cap for any indication of wear around the seal. Replace if needed.
It can't hurt to remove and inspect the thermostat housing; have there been any problems with cooling temps, not warming up fast enough or even too fast? And once all the parts are back in place, do a coolant service. Drain all the coolant and refill with a 50-50 mix of Dex-Cool and water.
It can't hurt to remove and inspect the thermostat housing; have there been any problems with cooling temps, not warming up fast enough or even too fast? And once all the parts are back in place, do a coolant service. Drain all the coolant and refill with a 50-50 mix of Dex-Cool and water.
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 532
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
Since I'm retired, therefore have time on my hands, when I heard about the potential issues with the "wobbly balancers", I immediately said, "Not on my car"!
So, I bought an ATI balancer, and their pinning kit. At that point, yeah, I also thought "while I'm in there", but having the rack out, and the balancer off, was 60% of the battle. So yes, I pulled the water pump and front cover off, then the oil pump, and replaced the timing chain. I will say this, though, the work room is a little cramped, so even the water pump removal wasn't a 5 minute job, like it would be on an older Chevy......
That sob was on there.
Team Owner
Joined: May 2001
Posts: 87,404
Likes: 1,595
From: Western NY
I didn't have that much trouble with mine. A "back in the good old days, made in the USA" Craftsman breaker bar, and a 6 point socket got it done. Applying the 237 ft/lbs. of torque, to tighten the ARP bolt, was a challenge, however.....