Engine won't get to temp

[Speedy j]

Hello Everyone.

I have an Astra se on a 2014 plate.

I had a new thermostat housing fitted last year and this morning my car was running fine at 90°. Drove home and I can't get it above 70° to 80°.Any ideas.

Thank you Jayne

[Vauxhall Owners Club]

There may be some air trapped in the cooling system
Pop it back to the garage who changed the housing and I'm sure it will only take them a minute or so to expel the air