Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: vauxhall nut on 15 November 2009, 20:10:20

Title: 2.0 omega 16v apparent overheating
Post by: vauxhall nut on 15 November 2009, 20:10:20
Hi can anyone help? i have a 1997 2.0 omega 16v the temp gauge is reading maximum after idling for a short time i suspect it is a temperature sensor/switch, is there any way to check it other than replacing it? also the heater is not working only blowing cold air any suggestions? Everything else on the cooling system seems to be working the fan kicks in to cool the radiator but i have no idea what temperature it is coming on at.The water doesnt seem to be boiling the radiator is cool(ish) to the touch.The gauge seems to come up steadily to about 95 then shoots up into the red any help gratly appreciated ;D >:(
Title: Re: 2.0 omega 16v apparent overheating
Post by: Ziad on 15 November 2009, 20:12:16
Sounds like you have a blocked rad and a busted HBV  :-/

Check out the maintenance section on how to take care of the rad and HBV  ;) :y

There you go:

http://www.omegaowners.com/forum/YaBB.pl?num=1167917774

http://www.omegaowners.com/forum/YaBB.pl?num=1193594464
Title: Re: 2.0 omega 16v apparent overheating
Post by: Welung666 on 15 November 2009, 20:13:00
Either an air lock of the thermostat it stuck shut.
Title: Re: 2.0 omega 16v apparent overheating
Post by: vauxhall nut on 15 November 2009, 20:18:58
I have changed the heater bypass valve for a new one and have removed the thermostat to flush the engine the water runs back thro the engine from the thermostat housing and comes out through the top of the radiator
Title: Re: 2.0 omega 16v apparent overheating
Post by: Ziad on 15 November 2009, 20:21:46
Then, probably an airlock or stuck thermostat as W666 says  :y
Title: Re: 2.0 omega 16v apparent overheating
Post by: Andy H on 15 November 2009, 20:26:54
Are you getting the apparent overheating with the thermostat out?
Title: Re: 2.0 omega 16v apparent overheating
Post by: Abiton on 15 November 2009, 20:27:51
Do you know when the water pump was last changed?

If that were failing to circulate enough volume, it might give your symptoms, I think.
Title: Re: 2.0 omega 16v apparent overheating
Post by: vauxhall nut on 15 November 2009, 20:30:59
Hi again thanks for the suggestions its not the thermostat as it isnt in how do i get rid of an airlock and could it be in the heater matrix cheers
Title: Re: 2.0 omega 16v apparent overheating
Post by: Welung666 on 15 November 2009, 20:33:53
Quote
Hi again thanks for the suggestions its not the thermostat as it isnt in how do i get rid of an airlock and could it be in the heater matrix cheers

Fill the system and leave the cap off the coolant tank, run the engine with the heating/climate on full/hot. Let it warm up while squeezing radiator and matrix hoses (CAREFUL WITH YOUR FINGERS) and keep an eye on the temp gauge.

Also try back flushing the raidator and heater matrix ;)
Title: Re: 2.0 omega 16v apparent overheating
Post by: Andy H on 15 November 2009, 20:37:49
Quote
Do you know when the water pump was last changed?

If that were failing to circulate enough volume, it might give your symptoms, I think.
Quote
Hi again thanks for the suggestions its not the thermostat as it isnt in how do i get rid of an airlock and could it be in the heater matrix cheers
If you have got zero circulation even with the thermostat out it sound too fundamental to be an air lock.

It sounds like the impeller has fallen off the pump shaft to be honest.

I have had this happen on commercial heating pumps but I didn't think that vauxhalls were prone to it :-/
Title: Re: 2.0 omega 16v apparent overheating
Post by: vauxhall nut on 15 November 2009, 20:39:13
as far as i know the water pump was changed with the cambelt about 15 months ago just before i bought it. and the apparent overheating happens with the thermostat out
Title: Re: 2.0 omega 16v apparent overheating
Post by: Welung666 on 15 November 2009, 20:41:25
A simple test for the waterpump...... take the thermostat housing off, fill it as full as you can get it then start up. You'll get a good gush until the supply runs out. If no gush then the water pump impella has come off as Andy says.