Hi All,
Recently i changed the expansion tank & coolant (step by step as mentioned in one of the how to guides) on my 98 tdi .. Even after replacing the old damaged expansion tank still loosing coolant .. So i took it to me local garage and they pressure checked the the cooling system ** no sign of any leak and no sign of head gasket being faulty ** .. So today i took the car out on motorway (p.s only loose coolant if i rev the car driving fast) .. did few miles at 70 - 75 mph and the coolant check light came on .. stopped the car and checked the upper hose connecting to radiator and it was warm/hot .. checked the bottom hose connecting and it was cold ... then i opened the drain valve and coolant came out like it was a bottle of champagne and after few seconds it went stable .. does that mean theres an air packet in cooling system ... One more thing the car doesnt over heat at all ... when i was driving earlier today at motorway temp was stable at 90 and when the coolant check light came on it dropped .
After draining some coolant from drain valve (as mentioned above) i topped up the expansion tank and when switchd on the car the temp needle was back to 90 mark and stable .. **CONFUSED**
Please Help.
Thanks
Sal
Recently i changed the expansion tank & coolant (step by step as mentioned in one of the how to guides) on my 98 tdi .. Even after replacing the old damaged expansion tank still loosing coolant .. So i took it to me local garage and they pressure checked the the cooling system ** no sign of any leak and no sign of head gasket being faulty ** .. So today i took the car out on motorway (p.s only loose coolant if i rev the car driving fast) .. did few miles at 70 - 75 mph and the coolant check light came on .. stopped the car and checked the upper hose connecting to radiator and it was warm/hot .. checked the bottom hose connecting and it was cold ... then i opened the drain valve and coolant came out like it was a bottle of champagne and after few seconds it went stable .. does that mean theres an air packet in cooling system ... One more thing the car doesnt over heat at all ... when i was driving earlier today at motorway temp was stable at 90 and when the coolant check light came on it dropped .
After draining some coolant from drain valve (as mentioned above) i topped up the expansion tank and when switchd on the car the temp needle was back to 90 mark and stable .. **CONFUSED**
Please Help.
Thanks
Sal