I have a 1984 Vanagon which has been overheating.  I have had  the thermostat, expansion tank = and cap, refill tank and, coolant replaced and completely bleed the = system.  My mechanic told me there was gas in my oil and did an oil and filter change.  The van ran great for about 2 weeks.  Now if I drive = more than a mile I'm running hot.  I do hear the electric fan kick = on, but not always when hot.  thanks, Jeff  =