Overheating When Going Hard

[john1doherty]

hi all

i had a problem with my 1.9tdi 01 galaxy overheating , it first happened going up a steep hill with a full car, temp shot up and STOP lit on the dash,pulled over let it cool down and then drove home (1hr away) and then was fine for a while . next time it happened my wife was going on a long journey and it happened a few times on the way there and the way back, so i changed the water pump and the thermostat and it was fine.that was last week and my wife went on the same 3 hr drive and she got there without problem however on her way home the car temp guage shot up to high and STOP flashed on the dash with the audible alarm, so she pulls over and switches off the car,sits for 5 mins and starts the car back up again and temp is normal she then headed on her way with the ac switched on to keep the cooling fans running just to get her home as it was rural roads and it was dark.

Can anyone tell me what the hell might be happening ? it is pi***ng me off at this stage not to mention the missus as she needs it to head to work 3 hrs away.

Cooling fans are working ok when the ac is turned on but i dont loke having the damm ac on for long journeys as it is winter and fuel economy suffers.

When i changed the pump etc i let the car run with the filler cap off and then checked heater was blowing hot air so i would not appear that it is an airlock.

Anyone any ideas