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[Diamond Black Geezer]

Anyone know which Omegas don't have coolant sensors - as far as I can tell it's the DTi (Pretty sure this is what I got my bottle off) or am I being perhaps a little thick, and there is a coolant sensor on the DTis, just elsewhere?

[omega2018]

parts catalogue just shows one tank with no serviceable parts (i.e. with sensor inside but not available separately):

part number: 90467473 13 04 666
description: COVER, HEADER TANK, RADIATOR
usage: 20SE, X20SE, X20XEV, Y22XE, Z22XE, X25XE, Y26SE, X30XE, Y32SE, X20DTH, Y22DTH

[omega2018]

correction, the catalogue is showing what looks like 4 different tanks, 2 with sensor, 2 with 2 ports on the top.  but only one part number and that may be the cap.

[omega2018]

here's what i can find re. part numbers if it helps anyone:

there are (at least) 4 variations of tank - 2 ports, 1 port, sensor, no sensor

90500223 (opel 1304203) tank, 2 port with sensor
90467473 (opel 1304666) cap
90411630 tank Petrol 1997 2 port probably no sensor
90411637 tank diesel non sensor

presumably there is another part number i haven't found yet for the last of the 4 tank variations - 1 port with sensor.

90500223 (opel 1304203) 2 port
Vauxhall Omega 1994-2003
FITS THE FOLLOWING…….
2.0 Diesel - X20DTH With Multi Function Display
2.0 Petrol - 20SE (8 Valve - No Catalytic Converter) With Multi Function Display
2.0 Petrol - X20SE (8 Valve - With Catalytic Converter) With Multi Function Display
2.0 Petrol - X20XEV (16 Valve Ecotec) With Multi Function Display
2.2 Diesel - Y22DTH With Multi Function Display
2.2 Petrol - Y22XE With Multi Function Display
2.2 Petrol - Z22XE With Multi Function Display
2.5 Petrol - X25XE With Multi Function Display
2.6 Petrol - Y26SE With Multi Function Display
3.0 Petrol - X30XE With Multi Function Display
3.2 Petrol - Y32SE With Multi Function Display
doesn't fit 2.5 diesel
does fit vectra, calibra

[omega2018]

was just about to start a post on this as yet again i have the "low coolant" mesage.  last time it was the electrics - reed switch failed or circuit board cracked.  this time though i opened up the reservoir and the float was floating around loose!  also found one plastic washer floating.  has anyone had this?  is it repairable?  or do i have to get yet another tank? looks fiddly to get your fingers in to fit the float back on.

for anyone else who has the same problem what i did in the end was remove the loose floating nylon washer, drain the coolant, locate the float back on the nylon post, push the washer back on the post (should clip on) then with a gas soldering iron gently heat the top of the post to deform it and press it flat to hold the washer on, like a rivet head. the washer still rotates freely (not that it needs to) but it hopefully stays on.

i couldn't see any other parts loose in the tank.

i had priced up replacement new tanks cheapest was autovaux.co.uk £36 +£3 delivery.

[Doctor Gollum]

New tank is the ONLY long term fix.

[raywilb]

excuse me if I seem to be hijacking this thread, but I once bought a header tank but it came without a sensor. are sensors available on their own & whats involved in putting a sensor in situ.

[raywilb]

Underneath the reservoir, moulded in 

Usual cure is replacement header tank. I imagine, in theory you cold remove the sensor and replace - but the only place I know to get a sensor from is another header tank.. thus defeating the object. As a rule the tank has gone manky yellow/urine coloured before/about the same time the sensor fails. 

If anyone has a hack to bypass the coolant sensor I have an excellent creamy new-looking header tank for sale, just from an Omega that didn't have a sensor. 

  if my memory is right- I once bought a new  header tank from a oof  member that worked for gm parts ( Paul I think) the tank arrived brand new without a sensor. apparently there is three part No,s  1, complete tank ( cap, tank & sensor . 2, tank & sensor & 3, tank ) I was sent just the h/tank, which has never been fitted.