I'm sorry if this has been discussed before. In March I had the timing belt and water pump done on my 06 A4 B7 cabriolet 2.0T. When I collected the car from the garage, the guy said he had found a water leak so had put some weld solution in. A week later, I returned it and said there was no heating and engine wasn’t reaching temp. He said something may be blocked from the leak weld so drained the system. For a while I was getting warm air from the vents but it’s now back to where it was. No warm/hot air from the vents, engine temp reaches max of 75 degrees. I’ve also got no air con although it has been confirmed that it is fully charged. I’m not returning it to the garage as I simply don’t trust him (there were no issues with car before it went in). Any suggestions as to what the cause could be?