A4 1.9 PD TDI 130 loosing coolant

Jacko1

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Hello ,

A4 1.9 PD TDI 130 loosing coolant , no obvious external leaks from hoses etc , no mayo in the oil -
strange additional symptom is that internal cabin vents red hot on passenger side and cold on driver side when calling for cabin cooling.

Possibly a blockage somewhere ? water pump failure ? should I start with a sniff test ?

Anyone have any ideas?
 
Have you checked the flange at the rear of the engine? I was losing coolant at one point and it turned out to have a hairline crack in it as it's plastic
 
Flange can warp over time with heat cycles. Plenty of ebay. So its worth inspecting it just in case.
 
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