OVERHEATING AND AIR LOCK 300 SEL 1983

[m_e_siddiqui@hotmail.com]

HELP AND SUGGESTIONS PLS. AFTER A NORMAL DAYS USE,WITH TEMP AT 80, THE CAR GOT HEATED UPO AND WENT UPTO 120 AFTER OF 4 HRS.WATERBODY, ALL HOSES CHECKED, NO LEAKS.REPORTED BUBBLES IN RESERVIOR. RADIATOR COLD,ENGINE HOT. WATER GUSHING OUT OF RESERVIOR.DISCONNECTED HEATER REV PIPE TO RELIEVE AIR LOCK TWICE, TEMP DROPPED BUT AGAIN GOES UPTO 100. RAD CLEANED. DO I NEED 2 RELIEVE AIR LOCK A NUMBER OF TIMES OR IT IS SOME OTHER PRBLM. ANYONE PL ADVISE. THANKS