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[STAVROS MOONIE]

Hi,just bought my Omega 2.5 and the fans on the rad do not kick in when needed,along with that the heater only blows cold so me thinks it may be the thermostat but if any of you guys could steer me in the right direction it would be much appreciated,Moonie

[Matchless]

Not enough information to go on.

Why do you think it is overheating? What does the gauge show?

Heater could be a number of things, feel the pipes on drivers side where the pass through the bulkhead. Engine running, heater on hot, blower running.
If one is hot, one cold then no or little water flow so look at the water pipe and vacuum connections to the heater bypass valve.
Both hot would indicate that the problem is with the air flow flaps in the cabin part of the heater. When you switch off the ignition what is shown on the climate panel temp displays?

[STAVROS MOONIE]

Hi Mr Matchless and thanks for the reply,I was told by the previous owner that it overheats as the fans dont kick in when required (I have bypassed the sensors and fans work fine) the temp gauge sits at about 90 all the time unless standing in traffic then it gradually rises.I know the fans are supposed to kick in at 100 but these dont,non at all therefore I think that the water in the rad is cooler thus the sensors not telling the fans to come on and with the heater not being warm I summized that there was no water circulation so put it down to a stuck thermo.I will have a feeel around as you say and get back to you,many thanks regards Moo

[Pete Elite]

When the engine is up to running temp. are the top and bottom rad. hoses hot, if so then the stat. is opening OK .

 As Matchless says, is there 2 dashes(--)in the climate panel temp displays when you switch ignition off ?, if so then there is a fault with the climate control and will have to be checked with a TECH 2.

[STAVROS MOONIE]

Cheers chaps,I will have a look at it later today (Fri) after its been for its medical (fresh mot) if it passes I will be made up as it didnt cost me a mint,it has 2 weeks mot left but I always take a car straight for mot just to make sure its 100% roadworthy before the kids get in it.Moo

[STAVROS MOONIE]

Quick update everybody,the car flew its mot and sat there quite happily at just over 90 degrees throughout the mot and emissions test but as soon as I arrived back home (2miles) the top rad hose split where it connects to the engine and emptied all over the drive.

There are no dashes etc on the climate control when I turn the car off so once again I think it may be the thermostat as there obviously is no water circulation which I presume caused the hose to blow.

Do the thermostats on Omegas have a habit of sticking at all,I know its a top end strip down so basically and I dont want to be wasting my time if the thermo is ok and there is another common blockage anywhere.

Its becoming a right pain as well now as the frost is coming and the heater also is not operating as it should due to no water flow,any more advice would be much appreciated,regards Moo

[MickAP]

I'd be inclined to put a new top hose on (must have been perished) and do the tests as suggested above.

If the temp gauge works then maybe not the stat.

Mick

[STAVROS MOONIE]

Thanks Mick but top hose was brand new GM one,looks like it did the same thing on last owner before he gave up and traded it in.Not to worry as I am replacing HBV this weekend along with thermostat and top hose while all the gubbins is off the top of the engine,I have also spotted a small leak from a pipe under the HBV so will have a look at that at the same time.Hopefully that will sort it and be the end of my problems,fingers crossed.I will keep you posted,many thanks regards Moo

[albitz]

I recently had the problem of fans not working.It turned out to be the fuse,which is one of the 2(green)  30 amp fuses in the fuse box in the engine bay - black triangular shaped box on n/s inner wing.
Worth checking fuse before pulling car apart.I seem to remember reading that when the thermostat sticks it sticks open rather than closed.