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[omegalyn]

Glad of the help Kevin, Thanks to you all.

[JamesV6CDX]

just got off the phone to a vauxhall dealer where i spoke to one of the mechanics that works on omegas alot and the 2ltrs fan is only a single stage fan comes on when the car reaches between 98-100 deg, he said if the car runs between 92-95 when moving its fine then if you stop and the temp goes up and the cooling fan kicks in before it hits 100 deg then every thing is fine, hes had 5 or 6 people in the last few mounths with omegas thinking their cooling systems are goosed but they were fine simular thing happening as with mine

Sorry, I really can't agree with this. None of my Omega's (inc 2.0s) have ever gone anywhere near 100 deg on the temp gauge in any conditions

There's still a prob here...

[Martin_1962]

My 2.0 never went over 100 even when towing

[geoff]

fan should cut in at around 94 to 96, mine cuts in about 95, 100 is to high i think,mine has just had coolant change ,changed it my self,got red stuff from vauxhall was only £11.40 for 5 litres cheaper then hallfords(15.99).does run a lot cooler though with red stiff rather than on the old blue stuff that i dumped out of it

[gizza]

my 2 ltr never goes over 100 deg the fan comes on at about 98 and the temp goes down very qiuckly but i might check and change the the temp switch to see what this does but ive had a vaux dealer and my mate who has his own garage tell me theres nothing wrong with it, ill see how much a temp switch is from auto vaux and go from there

[gizza]

just spoke to auto vaux and the sensors are £9.95 each so for peace of mind and an experiment got them ordered, they owed me around £25 for a faulty hbv that i sent back to them, ill change out the sendors and see what hapens and see if makes a difference its had a new waterpump coolant and hbv very recently and theres no air locks in it and the coolant is vauxhall stuff at a 50/50 mix.

[Kevin Wood]

New fan switch is a sensible move. If you want to test them, connect a multimeter on ohms across the contacts and place them in a pan of boiling water. They will go "click" and the resistance will drop to 0 ohms at the correct temperature. If the switch is specced to close at 96, it will need a few minutes in vigourously boiling water to operate. If it's fubar'ed no amount of boiling will get it to close, because you'll never achieve 100 deg C plus!

This technique can also be used to test the accuracy of the gauge sender. Remove from engine, extend wire from engine loom so you can get the sensor in a pot of water (a small camping stove avoids the need to park the Omega in your kitchen!), run a ground wire from the sensor body to the battery negative terminal, ignition on, heat water and see what the gauge reads. A thermometer in the water will allow you to calibrate it over a range of temperatures.

Kevin

[omegalyn]

Thank for the feedback folks,

I am going to check the coolant mix first, as this is what I did before I got this prob, if that dosent work then shall go through a list: stat, heater switch, etc, until I get a result. This might take a bit of time as I am in the middle of putting in a new kitchen, am now at the tiling stage, the walls are ORANGE with white units (wife’s input) ,looks ok though.
Anyway thanks again for lending me your thoughts, I shall keep you posted
Lyn.