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Author Topic: Leak where temp sensor is located.  (Read 2608 times)

Offline Jasikasisback

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Leak where temp sensor is located.
« on: 01 July 2015, 11:41 »
I have a water leak at the temperature sensor housing at the front of the block. Strangely enough it is leaking around the bolts...the leak is really really bad on short runs (up to 5 miles) as I have to refill the expansion tank as the warning light for low water flashes..it does not do this on long runs (say 90 miles or more)..

MOT time is in about three weeks, so I don't want to put tons of money into the car to have it fail on other stuff..(like really expensive stuff.,.)

Is it a big risk to simply tighten the two bolts that hold the housing...(how much does this housing cost?)

Will radweld work as a temporary fix...for the MOT...(I have been told that radweld will seal up stuff you don't want sealing up...such as affecting the water pump)...

The car is due a cambelt/tensionere in less than 5000 miles (I drive a lot so have it done every 60,000..)

Other stuff is the coolant intake housing at the front of the block )(already mentioned)

Just wondering as the car is 20 years old now...maybe time to let it rest...but I do enjoy driving it...despite the poor fuel economy...(a new Golf owner with the bluemotion engine told me that he gets 80mpg..hard to believe...) I do a lot of highway miles...so maybe time to get a diesel mk3 automatic (they are non existent as far as I am aware...at least on the market)
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Offline itavaltalainen

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Re: Leak where temp sensor is located.
« Reply #1 on: 01 July 2015, 14:04 »
How about you just replace the o-ring between flange and block for 50p?

O-ring is 36x3.15 or VW P/N 037121687
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Offline gazareth

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Re: Leak where temp sensor is located.
« Reply #2 on: 01 July 2015, 17:44 »
just the o ring probably wont fix it as the housings tend to crack just by the the bolt holes. it would have to be a serious leak to fail an mot. but the housings are readily available and only few quid. make sure you wirebrush head surface clean before fitting new one with a spot of silicone.
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Offline itavaltalainen

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Re: Leak where temp sensor is located.
« Reply #3 on: 01 July 2015, 21:21 »
Might have a look if I still have a newish flange kicking about.... not sure I haven't thrown most of my mk3 spares away already.
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2019 Seat Leon ST FR DSG 135kW - eclipse orange - 23k miles

Offline Jasikasisback

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Re: Leak where temp sensor is located.
« Reply #4 on: 02 July 2015, 20:06 »
Please have a look. I work in Coventry now so can pop by as you are not too far away??
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Offline itavaltalainen

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Re: Leak where temp sensor is located.
« Reply #5 on: 02 July 2015, 21:12 »
Does this look like yours (ignore it has two holes for temp sender, there is a plug in one that comes with it)?




Am in WR14 btw.
« Last Edit: 02 July 2015, 23:21 by itavaltalainen »
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Offline Jasikasisback

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Re: Leak where temp sensor is located.
« Reply #6 on: 03 July 2015, 16:45 »
Yes I think it is the same. I can drop by any night after work when convenient for you ..let me know...I finish work usually at five
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Offline itavaltalainen

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Re: Leak where temp sensor is located.
« Reply #7 on: 03 July 2015, 18:21 »
sent you a pm
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2019 Seat Leon ST FR DSG 135kW - eclipse orange - 23k miles
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