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Coolant alarm magnet has become detached 3 weeks 3 days ago #199929

I am trying to complete work on my 2004 TF to get it back on the road and have bought a s/h TF expansion tank with sensor, due to reading about the magnet escaping from the float in numerous TF's I have also bought a VW tank. Since I have not purchased the alarm circuitry I am still undecided which way to go. The VW tank almost fits straight in and has a reliable pressure cap but it senses with two prongs, triggering when the coolant level drops below them. The following ebay offering shows the similar mounting but the holes are a little further apart;
VW GOLF MK5 MK6 2003-2013 COOLANT EXPANSION HEADER TANK BOTTLE & CAP 1K0121407A
Completed

The surplus gudes for the wiring loom can be removed, any thoughts?

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Coolant alarm magnet has become detached 3 weeks 2 days ago #199930

That’s interesting, I fitted a VW tank half a dozen years ago & have never seen it referred to on a forum before. I doubt the stock alarm will work with the VW tank as it uses current flowing through the coolant whilst the stock circuit is a magnet & reed switch.
I built my own initially which was fine & would still be using it if an Australian box of tricks hadn’t appeared for the price of a packet of fags on eBay.
When I had the tf the magnet parted company from the float, I used a dental mirror to locate the hole & a pair cranked forceps to feed it back in.

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Coolant alarm magnet has become detached 2 weeks 6 days ago #199946

my TF is also 2005 and I agree that the coolant alarm system and indicator became standard in late 2004. I agree also that the tank was assembled with the float inside .I have had the sensor part go faulty but that is a part which push fits to the bottom of the tank. I think that a complete tank with float is you're only option

Mike

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Coolant alarm magnet has become detached 2 weeks 2 days ago #199983

I think about June 2004 was when Longbridge began fitting the TF with the wiring looms to to support a low coolant alarm together with modified instrument display which replaced the automatic gearbox warning light, which most TF's didn't require with a low coolant warning indicator. Curiously the early examples which had the wiring fitted, did not carry the sensor in the expansion tank! Presumably they were using up stocks of the old tanks before fitting the new design with the magnet sensor.
I put a new tank onto a mates TF which had this, and it worked great after fitting. I think anything made from September 2004 onwards had the sensor fitted in the tank.
My latest TF is a Jan 2005 model and it has the sensor fitted. My previous TF160 was a Jan 2004 build and had neither the wiring or the sensor. I fitted a contactless sensor on the outside of the tank and wired it to the unused gearbox fault lamp.
When I got rid of the 160 - or whats left of it after crashing on ice last winter, I removed the sensor from the expansion tank, its going spare if anyone wants a contactless level sensor that clips onto the outside of the expansion tank.

Sundance

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