1988 Astro Van. Well maintained. Second engine, good history, almost 100K
on the engine, so this is not problem associated with engine changing.
Ran hot. Changed fan clutch and water pump. Have had it at the mechanics
several times, pressure test, no discernable leaks. It loses fluid,
sometimes a half gallon on a 15 mile trip. Runs cool, normal at highway
speed, then heats up at red light stops. Cannot see any coolant leak on
pavement, ever. I see and touch/smell the A/C condensate, but never
At red lights, when it overheats, you can smell the telltale coolant aroma.
There is no water in the oil.
This driving us crazy, any ideas?