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Author Topic: Thermostat stuck open maybe?  (Read 376 times)

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danzigfan

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Thermostat stuck open maybe?
« 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

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danzigfan

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Re: Thermostat stuck open maybe?
« Reply #1 on: 26 January 2026, 18:00:56 »
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TheBoy

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Re: Thermostat stuck open maybe?
« Reply #2 on: Yesterday at 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?
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danzigfan

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Re: Thermostat stuck open maybe?
« Reply #3 on: Yesterday at 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.
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danzigfan

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Re: Thermostat stuck open maybe?
« Reply #4 on: Yesterday at 15:02:26 »
Just a thought...car would overheat on motorway if it was water pump failing probably?
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