Radiator Flush may cause water pump failure? [Archive] - SaabCentral Forums

: Radiator Flush may cause water pump failure?


its_tricky83
26-08-07, 10:12 PM
After my last service the Saab specialists recomended the Radiator fluid be fully flushed/cleaned as there is a build up of gunk in there.

They informed me that quite often after the flush they experience Water Pump failure. Is this known to you guys? and is there any steps I (or they) should take to avoid the pump failing?

Thirsty9000
26-08-07, 10:28 PM
You could try replacing the radiator instead, I'm sure even the most thorough of flushes won't restore full flow capacity to a radiator as old as a 9k. But that won't be much help in flushing the rest of the coolant system. I don't know how feasable it may be, but you could try to have the system so that it adds the fresh water at the waterpump and flushes the system from there. That would remove the risk of debris damaging the pump.

its_tricky83
27-08-07, 01:18 AM
I think I'll just have to wing it and hope for the best.

I'm considering doing this little mod to help in the future:
http://www.quasimotors.com/flush_tee.htm

http://www.gigcom.net/data/auctionittoday/inventory/20088/1182968977.462.jpg

MoreBoost
27-08-07, 02:42 AM
i used that a while ago, great product, so easy to install to flush the system, i recommend using it. Makes flushing the cooling system quick and easy, i first hooked the T up and connected my water hose, i then open the coolant tank cap and turned the water on and i let it over flow, then opened the radiator plug and let it drain from there, coolant was dark brown, i also used this different type of coolant from pepboys, that lowers the engine temp by 15 degrees, it comes in a tin can, with neon colors on it, and it works, my 9k was running almost up 2 the red and after i flushed the coolant and used that stuff it was back down to between middle and 3/4. Forgot the name, but that T is great, and once your done just cap it off and it doesnt even leak, screw the shops that charge 100 dollars to flush the cooling system

Superaero
27-08-07, 11:43 AM
Water pump failure is usually at the seal. If the seal is worn out it sometimes doesn't leak only because of all the crud built up inside the cooling system. When you flush it, it leaks. However, before rushing out to put anew water pup on just make sure you put some new fresh Bars Leaks in the newly flushed system. Likely the mechanics who flush your system will tell you not to, but even SAAB uses this stuff in another brand with GM on it!

Jim Mesthene
27-08-07, 12:33 PM
They informed me that quite often after the flush they experience Water Pump failure.
I agree.
Typically, people say "I can't believe all the gunk that came out", thinking they've fixed something. I've never seen a flush cure anything, but water pump failure afterwards is common.
Drain and refill with name-brand coolant every 30k, as called for in the manual. Never flush. If you have a radiator problem, replace it; flushing won't work.
Ignore imagined "gunk" that is invented by the makers of flushing products; this applies to engines, transmissions, power steering, A/C, brakes, as well as cooling systems.

Thirsty9000
27-08-07, 12:42 PM
I removed my radiator and ran a garden hose through it backwards and frontwards a few times, I got a fair bit of what looked like hard water deposits to come out. I wouldn't expect there to be much of that if your system has always been properly filled with antifreeze/coolant and distilled water. My car has always had overheating issues, so in desperate times it got filled with tap water several times. Even though I got a lot of junk out of the radiator, I'm certain it doesn't have the proper flow capacity so a new radiator is on my short list of fixes as well as a new thermostat housing. The corrosion in that thing blew my mind. I'm not sure if it's because of using bad water or from having a leaky headgasket that didn't let go all the way untill it got really hot this summer and I was giving it the beans passing a truck.

SaabKen
27-08-07, 03:45 PM
If you can, use Mercedes-Benz's OEM antifreeze (red stuff). One of the industry's best !

its_tricky83
27-08-07, 11:48 PM
... so in desperate times it got filled with tap water several times...

I have also needed to refill with Tap water numerous times.. my car does not overheat and is not leaking coolant but the coolant level is somehow running low every now and then.

So after repetative topups with plain water and a drop of coolant from time to time, I really do think it's time to fully flush the system.

I can't seem to find thie Prestone Flush'n'Fill available locally. Wondering if Honeywell would ship to tassie from the mainland for cheap, they're the only place online in aus that have them.

vnv727
28-08-07, 12:13 AM
If your going through the trouble, might as well replace the thermostat as well.

its_tricky83
28-08-07, 01:00 AM
If your going through the trouble, might as well replace the thermostat as well.

Had that done a while back already.

SaabKen
28-08-07, 03:34 AM
If your going through the trouble, might as well replace the thermostat as well.

I replace mine every 2 years. 82C version.

abusot
28-08-07, 01:21 PM
After my last service the Saab specialists recomended the Radiator fluid be fully flushed/cleaned as there is a build up of gunk in there.

They informed me that quite often after the flush they experience Water Pump failure. Is this known to you guys? and is there any steps I (or they) should take to avoid the pump failing?

I put Bars Leak in my radiator as preventative medicine and then changed my mind, so I cleaned the system out with a pretty aggressive cooling system flush that got all kinds of gunk out of the radiator, but my water pump immediately started to leak profusely.

However, I was able to stop the leak just by tightening the bolts that went around the pump housing.

Galvas
30-08-07, 01:18 PM
No no no no no no..........

Water pumps go to hell ( or wherever they go when they go bad :lol: ) only because when you do a flush or change the radiator, you remove the water / coolant in there and you canīt add the same coolant in the same porpotions....
Let me explain in another way...
Around here we car run with only water in the Coolant system... and thatīs fine, thereīs no problem whatsoever if the weather is not too cold to freeze the water.

If by any chance the owner sold the car and didnīt told this little thing to the new owner, when he add some anti-freeze to the coolant system ( just to put in on level ) or when the new owner makes a flush or changing the radiator, then the anti-freeze starts to damage the system that to that day never had anti-freeze corroding(?) some parts and causing a faliure ( normally the water pump).
Changing the brand of anti-freeze is enoughf(?) risk allready....

So, there you go... see what you have got first.... then do the same....

grade8graydad
30-08-07, 06:44 PM
No no no no no no..........

Water pumps go to hell ( or wherever they go when they go bad :lol: ) only because when you do a flush or change the radiator, you remove the water / coolant in there and you canīt add the same coolant in the same porpotions....
Let me explain in another way...
Around here we car run with only water in the Coolant system... and thatīs fine, thereīs no problem whatsoever if the weather is not too cold to freeze the water.

If by any chance the owner sold the car and didnīt told this little thing to the new owner, when he add some anti-freeze to the coolant system ( just to put in on level ) or when the new owner makes a flush or changing the radiator, then the anti-freeze starts to damage the system that to that day never had anti-freeze corroding(?) some parts and causing a faliure ( normally the water pump).
Changing the brand of anti-freeze is enoughf(?) risk allready....

So, there you go... see what you have got first.... then do the same....

Are you saying that unless you replace the coolant with a mix that is the same as was in there before, you're asking for trouble? :confused: I disagree. I think failure of the water pump after coolant change is because the pump was close to failing before the change. Temporary operation while the pump is empty and being refilled simply expedites the failure. Either that or the failure is totally coincidental.

its_tricky83
30-08-07, 06:53 PM
If that is the case I'm suprised my water pump hasn't failed already. I dont even know what coolant I have been using to top up, and as a matter of fact the last year or so I haven't been adding coolant, just keep adding water.

So no matter what the case is I feel I should flush the system.. if the water pump fails then so be it.. at least it means another new/refurbished unit will be going it. I guess the only thing I haven't considered is the labor cost to replace waterpump.. is this usually a pain in the **** for mechanics to do? will they charge a heap for labor on a water pump replacement?

timmehhhhhh
30-08-07, 11:46 PM
Try running a gallon or two of Vinegar instead of harsher flushes. My water pump is a victim of Prestone's Super Flush.