Hi.
Just joined here and so far it's looking good. I have searched for my probs but can't find what I'm looking for.
Heres my issue.
I bought a 02 A4 b6 1.9 tdi 130bhp.
The night I bought it was -3 degrees so this fooled me.
The car took ages to heat up and wouldn't blow warm air. I told the seller and he put it down to the freezing conditions and revved the car and the heat came. So I thought fair enough and handed over the cash. On way home the heater wasn't great. Then the red coolant light came on dash. I pulled over and topped up approx half a litre. The next day there was no heat at all although temp hand was at 90. It would blow warm and cold with no apparent reason randomly the rest of the day. Then it started to overheat and pressurised when on the power when overtaking and going up steep hills. I put a new pump and thermostat in with new belt and coolant. Problem was still there. I ran a hose through radiator and all pipes and matrix thinking on a blockage but still no good. Took the thermostat out and it made no difference.
Im at a loss of what to do next. So is mechanic. It's not mixing oil and water. It's not circulating the water at all. The metal water pipe at right side of head will be roasting but gets cold from the small pipe that leads to expansion bottle. Radiator is only ever like warm. This was flushed. I've bleed it aswell but makes no difference.
Im thinking on removing the head and getting it pressure tested.
What else can it be?
Sorry if that's hard to read or a bit long winded.
Any help would be appreciated as I'm about to go mad.
Thanks
Lee