Vauxhall Astra loses power when warm

Car: Vauxhall Astra
Variant: 1.6 petrol
Model Year: 2010
Categories: Engine & DrivetrainRunning Rough, Starting & Power Loss
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.
Posted: Apr 21, 2022 (2 years ago)
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
Posted Apr 21, 2022 (2 years ago)
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
Posted Apr 21, 2022 (2 years ago)
On some VXs they have a power sounder that can do this when the battery inside is needing replaced .
Posted Apr 21, 2022 (2 years ago)
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
Posted May 3, 2022 (2 years ago)
Pressure test on cooling system is good for checking for external leaks . Looks like it could be an intermittent fault with thermostat .
Posted May 3, 2022 (2 years ago)
Hi
Had thermostat housing replaced oil pump and it still loses power when warm.
The garage it went to is a independent Vauxhall specialist he said it’s normal for the 1.6 petrol to lose power.
Is the some truth to this or is he talking BS?
Thanks again for your help I appreciate any help you can offer
Posted Jun 22, 2022 (2 years ago)
You want to get a block test carried out which checks head / head gasket . Never heard of any car that loses power when it gets warm without having a fault , would be interested in knowing the reason / cause of it and why it affects that car .I believe some of those were prone to heavy oil consumption
Posted Jun 23, 2022 (2 years ago)

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