KPS
15-08-2007, 10:43 AM
w reg bora 1896cc se tdi pd, 91000 miles, main dealer serviced, owned from new.
Replaced cam belt; then later at intervals the water reservoir, the water pump and then thermostat. Problem now is at around 80mph the temp gauge suddenly goes hard right and STOP warning comes on. Just slowing the car down quickly brings temp down and I can drive on at 70mph with no problem. At end of trip I need to put about a pint of water in to top up reservoir. Car OK till next time I go over 70 on motorway (OK, ok I know one answer but the Bora likes doing 80!).
Garage now say it must be CH gasket - which is what I'll have to do I suppose; but 2 questions:
1. any other possibilities?
2. I can't get my head round what is going on if the CH gasket is the problem - why does it riun OK; then some event which causes temp gauge to go right up; then back to normal. What is the sequence of events in the engine to explain this. The garage view is that they can't explain therefore it must be CH problem. Any help appreciated. Thanks
Replaced cam belt; then later at intervals the water reservoir, the water pump and then thermostat. Problem now is at around 80mph the temp gauge suddenly goes hard right and STOP warning comes on. Just slowing the car down quickly brings temp down and I can drive on at 70mph with no problem. At end of trip I need to put about a pint of water in to top up reservoir. Car OK till next time I go over 70 on motorway (OK, ok I know one answer but the Bora likes doing 80!).
Garage now say it must be CH gasket - which is what I'll have to do I suppose; but 2 questions:
1. any other possibilities?
2. I can't get my head round what is going on if the CH gasket is the problem - why does it riun OK; then some event which causes temp gauge to go right up; then back to normal. What is the sequence of events in the engine to explain this. The garage view is that they can't explain therefore it must be CH problem. Any help appreciated. Thanks