www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2014 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You



Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Reply
 
Thread Tools
Old December 26th, 2011, 20:54   #1
tothemax
Veteran Member
 
tothemax's Avatar
 
Join Date: Aug 2006
Location: West Coast
Default How can tell if my water pump stopped pumping?

Car overheated a cpl times when pushing her hard..... noticed the fans will not come on without turning on the AC.... noticed the top water hose going to the radiator is super hot but the bottom hose is cold.

How can tell if the water pump stopped pumping?...

Noticed temperature goes to the 205... 210...range.. at times

The fans both work if the AC is switched on but not otherwise.... I bypassed the fans at the temp switch.. .they both came on... thought it was the switch... changed the switch .... still no fans working after changing out the switch ..

then I changed the thermostat... still no fans working..

The heater in the cab seems to work fine and I get plenty of heat from there....

There does not appear any flow into the expansion tank when the engine is running...

I am suspecting the water pump failed but not 100% sure ... is there a way to find out for sure if it is pumping or not?

Another 20,000 mi or so to the next TB change.... so maybe it's time to change the whole thing our early?

You thoughts?

tnx
tothemax is offline   Reply With Quote
Old December 26th, 2011, 20:57   #2
gquenstedt
Veteran Member
 
Join Date: May 2006
Location: San Antonio, TX
Default

Best way to confirm is take out the thermostat and try to spin the impeller with your finger. It should not spin.
__________________
Check out my website: www.gqlaw.us
gquenstedt is offline   Reply With Quote
Old December 26th, 2011, 21:06   #3
Ski in NC
Veteran Member
 
Join Date: Jul 2008
Location: Wilmington, NC USA
Fuel Economy: 48-52 typical
Default

Open cap on plastic coolant bottle. With engine idling, the top hose should be dribbling coolant into bottle. Get someone to rev motor, dribble should turn into a stream. No flow there and likely impeller is slipped.
__________________
2001 Jetta TDI 5sp Stock 201k mi
1981 Rabbit IDI 4sp Sold at 339k mi
1990 S-10 4.3 4wd 5sp 154k mi
1986 VW Pathfinder 1.6 45hp Marine 4700 Hrs
2001 Cummins 8.3 420hp Marine 1660Hrs..REFIT DONE!!
Ski in NC is online now   Reply With Quote
Old December 27th, 2011, 03:23   #4
chrisfiat
Veteran Member
 
Join Date: Jul 2006
Location: farmington nh
TDI(s): 97 jetta
Fuel Economy: 48
Default

will over heat very quickly at idle or on the road
__________________
third diesel, 97 tdi jetta 210000 50mpg avg
vag-com, ase master
i am the diesel tech at duponts service center
1976 Fiat 124(you know the top goes down)
chrisfiat is offline   Reply With Quote
Old December 27th, 2011, 05:03   #5
oilhammer
Certified Volkswagen Nut Vendor
 
oilhammer's Avatar
 
Join Date: Dec 2001
Location: St Louis
Default

Yeah, shoulda checked that impeller while you had the 'stat out.
__________________
oilhammer
www.cardocautomotive.com
oilhammer is offline   Reply With Quote
Old December 29th, 2011, 18:46   #6
tothemax
Veteran Member
 
tothemax's Avatar
 
Join Date: Aug 2006
Location: West Coast
Default

Quote:
Originally Posted by chrisfiat View Post
will over heat very quickly at idle or on the road
It does not overheat quickly while on idle but if I push is super hard... like in racing.. it does.. also jsut driving it on the freeway normally, it gets up to the 200 to 205...

Also another dumb question... can the pump fail slowly where it still pumps but not as strong as it should? or does it fail suddenly like ... is there only two case .. either it pumps or it does not?

I plan to take the thermostat out again this weekend to check the impeller but would like to know the answer to the above question... I did the test of looking into the expansion tank while someone else is revving the engine and I did see an increase in flow into the bottle but it still appeared pretty weak and there was a lot foam/ small bubbles in there...

It did not look a like a strong flow ... not really sure what it should look like... I guess I should check on my Golf to see what a normal flow looks like... I will as soon as my boys come back w/ the Golf...
tothemax is offline   Reply With Quote
Old December 30th, 2011, 04:35   #7
mlemorie
Veteran Member
 
Join Date: Aug 2009
Location: Romulus Michigan
TDI(s): 2004 Jetta
Fuel Economy: Avg: 43-44
Default

To make it easier I usually pull the return line off the bottle and hold it over the opening while I have someone start the car and rev it. It makes it a lot easier to tell just what kind of flow you are getting. I have seen a few pumps that cracked around the inside ring where it mounts to the shaft. They would still spin and pump fine at lower RPM ranges, but once the RPM came up and they started spinning faster they would start to slip. Although usually the whole thing just breaks apart.
__________________
I have VCDS and plenty of tools.
mlemorie is offline   Reply With Quote
Old January 3rd, 2012, 09:48   #8
rocketeer928
Veteran Member
 
rocketeer928's Avatar
 
Join Date: Jan 2008
Location: Western Connecticut
Default

Did you have a chance to check out the water pump's impeller last weekend, Pierre?
__________________
Links: 2003 Jetta GLS TDI with Deutschland GŁnther-Tune specific to my performance modifications - Platinum Gray

rocketeer928 is offline   Reply With Quote
Old January 3rd, 2012, 10:02   #9
DanG144
Veteran Member
 
Join Date: Aug 2007
Location: Chapin, South Carolina, USA
Default

If it is reliably keeping your cabin heater pumping out heat, I don't see it being the water pump.

The water pumps can fail such that they slip intermittently. They will tend to slip more when hot.

When you say the car overheated, what temperatures were you seeing? What were you reading them on? 210 on the head outlet temperature pushing it hard is normal, in my opinion.

But remember the gauge is computer driven; it reads centered (90C or 190F) over a wide range of temperatures - about 167 F to 225 F. So as soon as it goes up off of center it is already at 226F, not 191F.

The fans are typically turned on by the radiator thermoswitch which is halfway down the radiator; if you have any breeze across it the fans will rarely come on as it has cooled below the fan setpoints prior to getting halfway down the radiator.

Bentley fan operating points, from the radiator thermoswitch:
low speed
on - 197-206 F (92-97 C)
off - 183-195 F (84-91 C)

Fast speed
on - 210-221 F (99-105 C)
off - 195 - 208 (91-98 C)

DanG144 is offline   Reply With Quote
Old January 19th, 2012, 23:02   #10
tothemax
Veteran Member
 
tothemax's Avatar
 
Join Date: Aug 2006
Location: West Coast
Default

Quote:
Originally Posted by rocketeer928 View Post
Did you have a chance to check out the water pump's impeller last weekend, Pierre?
I did check and it's tight so I assume it's working... still can't get my fans to get going... oh well .. .just have to not race any more Audi's and I'll be fine..
tothemax is offline   Reply With Quote
Old January 20th, 2012, 04:41   #11
dan kerkstra
Veteran Member
 
Join Date: Jul 2011
Location: ardmore ok 73401
Fuel Economy: unk trans is on floor
Default

Just my 00.2 , due to age make sure the radiator isn't limed up onthe inside restricting the flow, had my dodge diesel start to overheat each time I put it under load, put in a new radiator fixed the problem, long shot, but acted the same as your.
dan kerkstra is offline   Reply With Quote
Old January 20th, 2012, 05:08   #12
DanG144
Veteran Member
 
Join Date: Aug 2007
Location: Chapin, South Carolina, USA
Default

I have also seen radiator heat transfer restrictions. The interior passages were clean and open, the exterior looked fine, but corrosion from a salt environment (Hawaii) had caused poor heat transfer at the fin to tube junction.
DanG144 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
water vs plastic water pump video leicaman TDI 101 42 November 6th, 2010 09:01
water pump maniaq TDI 101 1 March 29th, 2010 05:39
Injection Pump Leaked Then Stopped terrydtdi TDI 101 4 July 15th, 2009 12:12
Injection pump not pumping? jconnelly TDI 101 7 March 2nd, 2007 14:41
Stretch Bolts for water pump/ water pump change. Vinyl_Addict TDI 101 7 July 11th, 2006 08:11


All times are GMT -7. The time now is 17:20.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2014
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
© 1996 - 2013, All Rights Reserved
Page generated in 0.15460 seconds with 10 queries
[Output: 112.53 Kb. compressed to 95.30 Kb. by saving 17.23 Kb. (15.31%)]