Golf running too hot / too cold


New member
Hi guys I’m be on the forum and hope you can help. I recently had a new thermostat after driving the car and noticing the cabin and oil temp were too cold. Since then the cabin now warms up but the car still dont get to the right oil or water temp. I had the thermostat replaced again and when the garage tested it by leaving it running, it got up to temp.
As soon as I drive the car around the water and oil go up an down depending on how I’m driving and don’t ever reach the right temp.
This was in winter, now the warmer weather is here the car will run hot on the motorway on longer runs but still not get up to temperature around town.
I could take it to another garage but is there anything obvious I could check myself?
Thanks Ben