Hi folks, I recently bought a 98 323 Saloon, with 143k miles with BMW service history for =A31300. On the drive home to for 60 miles on M25 it never overheated. Next day when I drove in traffic it overheated to red mark on temperature gauge. Upon refilling the coolant, the heaters didn't work (air con), which I subsequently foung out meant I had most likely airlocked the water cooling system. My local garage examined the system for a leak in the pump, etc. and found none. They topped up the coolant in the correct manner with no airlocks. Oil cap on engine found a oil & water emulsion. My garage tells me the head gasket needs to be replaced. Car never knocks and drive smooth and acceleration is just as of new. Until it get overheated for 3-4 miles when start from cool.
Also what sort of cost would I expect to pay to replace the head gasket and skim the head cost aroun =A3700? Or replace a new rebuilt engine for another =A31000.