Overheating Engine?

Thanks Mark I kind of felt it was but wanted a reassured answer.

While driving I noticed the temperature gauge was reading very high, so I pulled over and coolant was coming out of the expansioin bottle. I removed the stat. And topped up with water. It continued to overheat.
When I got home, I ran it until it overheated and noticed that the cooling fan only kicked in as coolant started to come out of the expansion bottle. So I replaced the thermal switch. Drained and flushed the system - all appears clear. Refilled system - ran it two/three times heat up - cool down to get rid of air pockets. Took it on the road maybe 5/6 miles stopped and let it running, it was bubbling slightly not bad thought it might be air. Returned home and let it cool down. Topped up when cool - 2pts. Now runs fine maintains proper running temp while driving but once I stop the engine coolant starts coming out of the expansion bottle. I've disconnected the overflow piipe to the top of the expansion bottle and got someone to bring the engine up to 3000rpm and coolant squirts out. I was told that this wouldn't happen if my water pump wasn't working. Help! I'm at my wits end. The model is a VW Vento a variation of the Jetta that VW brought out over here in Europe. It's got a 1.4ltr engine.

Heater problem
1991 Volkswagen Jetta 6 cyl All Wheel Drive Automatic unknow miles

My car has overheated a couple times and is at the point where it might overheat again. When I see the the thermostat go up I crank up the heat causing the thermostat to back to normal.

I don't know much about cars but I know the thermostat has been changed.

Any ideas on what's wrong?

Thanks

I am having the same problem it keeps overheating.

I have removed the thermostat and it still overheats

what do I check next?

Plugs are not wet, what do I check next?

How is the coolant level?

Before you do anything invasive, such as paying for a head gasket, try a full rad flush. Or just topping up the antifreeze or adding some water wetter.