A4 TDI Overheating does not over heat whwn ideling removed thermostate changed water pump dont think its the head gasket can you think of anything else thanks Dougie

do a compression test to check for head gasket or cracked head
to get closer to a solution a description of the conditions and driving is necessary

If it did it when you first started the car(cold) , Head gasket is bad. Otherwise , shooting out would normal if the car was hot. If it overheats at idle, look to the thermostat. If it only overheats when driving, look to the water pump.

Check to see if your fan is coming on. if it is then check the middle of your radiator if it is cool while the outside is hot you have plugged radiator

If you got a blown head gasket, water is getting mixed with your oil, pretty much ruining it, and your oil's viscosity will be affected, causing oil pressure to drop and your light turns on.

How do you know your car is overheating if it's not showing in your gauge?

When replacing blown gaskets there are a few things that is best to do, like sandblasting the heads, clean, scrape block and use proper torque an sequence, only removing old gasket and placing new ones won't fix the issue, those gaskets go through extreme conditions, expansion, temp changes, etc, they need to be put mindfully. I mention this because it seems you changed a lot and ended up with the original issue...

If your gasket is blown you need to fix that asap, then identify where is your coolant leak/blockage that causes alleged overheating, doing a coolant flush might help. Good luck.

replace fan clutch & thermostat.

Overheating could be anything in the cooling system. Thermostat is out, could be radiator, water pump, broken belts which cause the water pump to not move, cylinder head warped, cracked, or the cylinder head gasket.

well you may have put the gasket back on wrong blocking the oil hole which supplies the oil to the head, this would cause the low oil pressure and the oil light coming on.
If the gasket is on the wrong way it may be causing the overheating problem as well by blocking or partially blocking the water holes in the head that allow the water to get to the head and cool it down.
these are the only things I can think of apart from maybe a cracked block caused by the overheating but that would not explain the lack of oil to the rockers
Hope this helps

CHECK WATER LEVEL CHECK OIL LEVEL IF NO WATER FILL UP AND IF WATER DISSAPERS OR TURNS MILKY YOU HAVE A HEAD GASKET PROB CHECK WHILE RUNNING BUT DONT GET TOO HOT

It can a the first stage of blowing head gasket.

Fill your coolant tank to the full mark when it's COLD.

Start the car, and pay close attention to the tail pipe for a small puff of white smoke.

After 15 minutes,If you do see any vapor then take the car for a 8 minutes drive.

Park the car and listen for bubbling sound from the coolant tank,

If you see bubbles coming up then you will need a head gasket change real soon.

Assuming you have no loss of water invesigate the cooling fan operation.If you are losing water but cannot see signs of this then investigate your head gasket.