Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: danzigfan on 26 January 2026, 18:00:18

Title: Thermostat stuck open maybe?
Post by: danzigfan on 26 January 2026, 18:00:18

Hello guys, my Omega developed strange temp gauge behaving few days ago. Temp raises from cold start without a problem, holds steady 85 deg as always on motorway for entire trip to work - 45 miles long and even when I stop at red light when I arrive into town. But when I take off from stop, twmp gaige drops a few degrees and then comes back to 85. Wayer pump was done a year and a half ago, together with belts and pulleys. Ibposted a link to short youtube video of mine for you to see what I mean.
Thanks in advanceStan

Title: Re: Thermostat stuck open maybe?
Post by: danzigfan on 26 January 2026, 18:00:56

https://youtu.be/3dr38L20yNk?feature=shared

Title: Re: Thermostat stuck open maybe?
Post by: TheBoy on 28 January 2026, 12:23:50

Normally, a stuck open stat would cause slow heat up, but you say yours is normal?  ie, will reach normal temp within about 2 or 3 miles of gentle driving?

The video certainly does look like it's suddenly getting a load of cooler coolant to the sensor after revving.  No fans stuck on?

Title: Re: Thermostat stuck open maybe?
Post by: danzigfan on 28 January 2026, 14:43:26

No fan stuck on...It heats up to the temp as normal and doesn't want to overheat. Temp is steady on motorway only interior heating is poor. Heater matrix is clean - done in september.

Title: Re: Thermostat stuck open maybe?
Post by: danzigfan on 28 January 2026, 15:02:26

Just a thought...car would overheat on motorway if it was water pump failing probably?