Loses power when warm
2010 Vauxhall Astra 1.6 petrol

My 1.6 petrol 2010 Astra J drives ok when cold, but when warm it loses power and the temperature gauge goes from cold to halfway then about 10 to 15 minutes later it goes back down to cold. The is no warning lights on nor any codes.
Any help will be appreciated.

Problem added: Apr 21, 2022 (1 month ago)
Avatar
Toeknee
1 points

Vauxhall Astra
Year: 2010
Variant: 1.6 petrol
Problem Category
Engine & Drivetrain
Running Rough, Starting & Power Loss

Replies and fixes

Could be thermostat sticking . Years back I had Vauxhall in that had a similar , strange fault . It was cyl head gasket that had a small leak and was pressurising the coolant system . It was a kind of one off that took some finding . A block test would verify or not . Could also be a partially plugged exhaust / cat
Replying to post by whittingehame:
Could be thermostat sticking . Years back I had Vauxhall in that had a similar , strange fault . It was cyl head gasket that had a small leak and was pressurising the coolant system . It was a kind of one off that took some finding . A block test would verify or not . Could also be a partially plugged exhaust / cat
Hi
Thanks for your help when I turn the key but not starting the car it make a weird fast bleeping sound.
No one seems to know what it is and I don’t know how to upload a video of the sound
On some VXs they have a power sounder that can do this when the battery inside is needing replaced .
Thanks for the advice.
I’ve had a coolant pressure test done and all ok.
A code has come back saying the thermostat is sticking and now in garage being fixed.
But the Vauxhall specialist has said he can’t find anything wrong when temperature is up the is power there.
Sometimes it loses power then the is times it’s ok.
Bit of a head scratcher
Pressure test on cooling system is good for checking for external leaks . Looks like it could be an intermittent fault with thermostat .

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