TempSender Replacement

D

dc2100k

Member
Hi,

Just a quick request of those who have replaced their sender units. Mine has, as seems common, stopped working 90% of the time and I picked up a replacement from VAG today.

I have located the sender on the right side of the engine block facing downwards 30degrees. Does anyone have any advice for removing the connector - removing the plastic clip - removing the sender - avoiding coolant loss - doing all this in reverse to remedy the fault.

The main obstacle is the myriad wires and pipes which make access to this part rather awkward. There seems to be an angled part sticking out of the sender that presumably holds the connector in place - how do you get the connector off without breaking things. Also, is there a specific wy in which the clip mounts to hold the sensor in place?

Any advice most gratefully received,

Kind regrds,

James.
 
Hi James
I changed the temp sender on my TDi back in 2005. The following extract from the related post may give you a few pointers

''Replacing the thermostat did not fix the wandering temperature gauge. Stage 2 was to swap the temp sender unit located on the gearbox end of the cyl block. It seals with an O.ring and is a push fit in the housing, held in with a plastic U.clip. It's possible to replace it without draining the coolant but the location makes this rather tricky - I lost about 1/2 litre of anti freeze in the process - but that was not the worst bit. While trying to replace the U clip I dropped it down the back of the gearbox. Without the clip you can't start the engine as the sender will just blow out with the water pressure. Frantic searching and the use of a 'bottle brush' to sweep out every nook and cranny finally dislodged it. For the second attempt, I looped some thin string round the clip before clicking it into place - it was not going to escape a second time. All that was left to do was remove the string and top up the header tank. After over 100 miles the gauge is still working perfectly.
Before starting this job, I was 80% certain it was the thermostat. It cost me a wasted £12 and 1/2 a days work so unless the symptoms are 100% I would go for the temp sender first. It cost approx £25 plus an hour to fit - providing you dont loose the clip.
Tip of the day - spend an extra 50p and buy a spare clip before you start the job.''

Cheers Spike
 
I've got the same problem but on my 1.6 FSi there appear to be 2 sender units on the thermostat housing. Both are on the lower part of the housing one at the back which looks to have 1 possibly 2 wires and the one at the front which has 4 wires. Can anyone advise which one feeds the temp gauge ?

Thanks

Simon
 
Hi Simon
The one which fed the temp gauge on my TDi had a green body with 4 wires.
The p/n was 059 919 501 A

Cheers Spike
 
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