Really loose coolant temp sensor

mrsmart180

Active member
Joined
Aug 29, 2020
Location
North Carolina
TDI
2000 Golf TDI ALH
I figured I would change my CTS after I did my timing belt change. I installed it but it wiggles a whole lot. I didn't realize this the other day and I was revving it high and saw tons of coolant pouring out of the cts. Why the heck is it so loose? I used one from idparts so I dont think its a junk one.
 

Mongler98

Top Post Dawg
Joined
Mar 23, 2011
Location
Northern MD (HAGERBUSH)
TDI
98 Jetta TDI AHU 1.9L (944 TDI swap in progress)
lol
definitely missed installing the o'ring, i did that once! easy to do when the part your replacement for the first time was covered in greasy mess or was missing, in my case, it was really nasty and i pitsuprisinglyched it, also did it in the dark with a headlamp soooo.
 

Mongler98

Top Post Dawg
Joined
Mar 23, 2011
Location
Northern MD (HAGERBUSH)
TDI
98 Jetta TDI AHU 1.9L (944 TDI swap in progress)
then its not the correct part or the threads are cracked or stripped
take it off and compare with old one
it should be a hand tight job that compresses the seal.
 

AndyBees

Top Post Dawg
Joined
May 27, 2003
Location
Southeast Kentucky
TDI
Silver 2003 Jetta TDI, Silver 2000 Jetta TDI (sold), '84 Vanagon with '02 ALH engine
The CTS on a 2000 ALH engine doesn't have threads........... It is secured in place by the use of a horseshoe style clip! Using a new O-ring requires a bit of pushing to properly install the Horseshoe Clip....... then, the CTS will not be loose!
 

jmodge

Veteran Member
Joined
Jun 18, 2015
Location
Greenville, MI
TDI
2001 alh Jetta, RC2 5speed daily commuter and 2000 alh Jetta 5spd swap, 2" lift, hitch, stage 3 TDtuning w/502's backroad cruiser
The o-ring May have rolled. Purchase a tube of syl-glide, it’s water resistance and good to a few hundred degrees of temp. Makes coolant o-ring jobs much easier and more successful
 
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