Starfish

I hope this is the right format.
First timer here and iqnorant about cars but a frustrated Audi owner. The car has been overheating and in the shop twice in the last 6 months. I had the head gasket, water pump (twice), thermostat and reservoir cap replaced. Fan seems to run fine and no leaks discovered during pressure tests.Yet I will be driving only a short distance when the inside heat turns cold, temp climbs and water/antifreeze spews out the overflow. Mechanic says "keep water in it" which is obvious but unless I have the cap on so tight I can't budge it in order to top it off(yes, I'm wimpy) the water will pour out in just a few blocks. Running the air on high seems to bring temp down and heat comes back. Now mechanic says "sell car". Any other suggestions?

audiA6GT

Radiator flushed? On my '84, rust/debris in radiator caused blockage.

islingtonaudi

Mine overheated in traffic...was blocked radiator as below. Put in new one, now great!

Starfish

Thanks for the tip. Thats one thing I haven't replaced!

Starfish

Radiator seems to be the consenses and I live on the Orgon Coast where rust is king!

islingtonaudi

Price it out online. I paid $320 for part in L.A. but cheaper places out there. 5 hr. job