Engine Cooling problem
1988 Honda Accord 4 cyl Front Wheel Drive Manual 200000 miles
Original problem: engine overheating. Replaced head gasket, water pump and belt, water pipe and all the small water hoses, radiator, cleaned out all the passages in the head and intake manifold, radiator cap, flushed heater coil (was fairly clean), thermostat, temperature gauge send unit, and TW sensor aka coolant temperature sensor. New problems:
1) temperature gauge pegs on HOT when simply turning the key on, about 6 sec.
2) cooling fans will not come on
3) after about 5 minutes “engine light" comes on
4) diagnostic indicator under drivers seat flashes every two seconds continuously; no pattern.
However, the engine is not running hot as long as I jump the fans and keep them running. I haven’t tried it without the fans running. I have checked it with a laser heat sensor on all areas such as thermostat housing, upper/lower radiator hoses, engine block, exhaust manifold, various small water hoses and it is well within specifications. One other item; there is another sensor next to the TW sensor which does not show in the shop manual, Chilton’s, or Haynes. It has a larger base nut than the TW sensor, it takes 22mm. No, haven't changed the thermosensor on the radiator, and it is running smoother than it ever has; go figure.
have the same problem?
Monday, April 5th, 2010 AT 10:17 PM