www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Order your TDIClub merchandise and help support TDIClub


Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

Reply
 
Thread Tools
Old October 14th, 2004, 03:30   #1
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default Coolant thermostat housing problem

Last night while checking my oil I noticed a dry pink crus on the rear of the thermostat housing on a connector. I have provided two pictures so maybe you could help me out. The first one is a shot of the left side of the engine. The leak is behind the cylindrical vacuum box. It is originating from the housing where a connector attaches. Is this the coolant temp sensor? Why would this be leaking? A bad o-ring? I have no engine faults yet. The second picture is a pic of the actual leak at the connector. Please get me some part numbers and some advice on how to change this oput properly. Thanks.

POWERSTROKE is offline   Reply With Quote
Old October 14th, 2004, 06:01   #2
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default Coolant thermostat housing problem

Is this the o-ring causing this to leak? On a 2002 golf do I order the blue or the green sensor?
POWERSTROKE is offline   Reply With Quote
Old October 14th, 2004, 06:12   #3
VelvetFoot
Veteran Member
 
VelvetFoot's Avatar
 
Join Date: May 2001
Location: Sand Lake, NY
Default Coolant thermostat housing problem

Is that the thermostat? It looks like the vacuum pump. If you're sure it's the coolant sensor, just ask the vw parts guy for a sensor for your model/year car.
VelvetFoot is offline   Reply With Quote
Old October 14th, 2004, 06:21   #4
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default Coolant thermostat housing problem

It's behind the vacuum pump in the first picture. It goes into the thermostat housing from the rear, towards the front of the car. It has an electrical connector at the end. My guages all work, it is just leaking a little bit and forming a crust.
POWERSTROKE is offline   Reply With Quote
Old October 14th, 2004, 06:42   #5
pepper10
Veteran Member
 
Join Date: Apr 2004
Location: Manchester, NH, USA
Fuel Economy: 46 Avg
Default Coolant thermostat housing problem

Did you check for coolant migration??? Unplug the connector at the coolant reservoir to see if coolant is present in the connector and seeping up the wires. If so, you are in for the ride of your life in replacing wires! Otherwise, you might have a bad seal at the temp sensor. If you want to replace the sensor, you need a green one, part 059 919 501A. This thread gives you more info: Temp Sensor
pepper10 is offline   Reply With Quote
Old October 14th, 2004, 06:44   #6
BKmetz
Administrator, Member #10
 
BKmetz's Avatar
 
Join Date: Sep 1997
Location: Illinois
Fuel Economy: 50 MPG
Default Coolant thermostat housing problem


Under the vacuum pump is the housing for the 3 COOLANT GLOW PLUGS that heat the coolant. These are the 12mm glow plugs everybody gets confused with the 10mm engine glow plugs. The coolant glow plug housing does resemble a thermostat housing. That's what I'm seeing here.
BKmetz is offline   Reply With Quote
Old October 14th, 2004, 06:45   #7
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default Coolant thermostat housing problem

no coolant migration. I have the hole mod. It is leaking between the housing and coolant temp sensor.
POWERSTROKE is offline   Reply With Quote
Old October 14th, 2004, 13:50   #8
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default Coolant thermostat housing problem

It is the coolant temp sender behind the coolant glow plugs and vacuum pump. It is leaking between the housing and the sender itself. Any tips on changing this item without emptying all of my coolant? I am assuming it is the seal that went bad. I will change the sensor as well because I have the old black one.
POWERSTROKE is offline   Reply With Quote
Old October 14th, 2004, 14:44   #9
VelvetFoot
Veteran Member
 
VelvetFoot's Avatar
 
Join Date: May 2001
Location: Sand Lake, NY
Default Coolant thermostat housing problem

There have been several recent threads on this. Here's one.

Along with above, I would say also to remove and then replace the reservoir cap to make sure pressure is released.
VelvetFoot 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


All times are GMT -7. The time now is 18:51.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
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 - 2017, All Rights Reserved
Page generated in 0.12856 seconds with 10 queries
[Output: 86.26 Kb. compressed to 73.41 Kb. by saving 12.85 Kb. (14.89%)]