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Test the sensor (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by Walter K on May 20, 2001 at 21:52:02:

In Reply to: overheating or guage malfunction posted by Enviro on May 20, 2001 at 11:25:03:

Bentleys says that the temp sendor (single non clipping lead sensor on thermostat housing) should read

for 533i
temp 14 F 7000-11600 ohms
68 F 2100- 2900 ohms
176 F 270-400 ohms

535i
temp 14 F 8200-10500 ohms
68 F 2200- 2700 ohms
176 F 300-360 ohms

If you're down around 300 ohms when hot (near red)that would seem to mean that the guage & electronics etc were working right.

Last hope, bad sensor - remove and test resistance in fridge/ freezer and on stove with termometer to get temperature exactly right.

Most cars if you overfill a little past the line on the expansion tank and run up around the red line will pee out some coolant in the parking lot when you stop - if you're seeing some coolant loss - its probably really geting hot.


First thanks for the forum and all previous assistance. I am humbly seeking more wisdom. My temperature guage when idling after a short drive sits very close to the red zone. When I drive on the freeway, it moves back a bit but not much. When I stop and check the engine, the engine appears hot but the small tank upon opening does not show any sign of boiling. (Perhaps it is not supposed to - I don't know.) I've changed the water pump, temperature sending unit, hoses, and bled the system using metric mechanics instructions. It has a new radiator, as well as a new BMW factory rebuilt engine. I have not changed the fan clutch as it showed signs it was working. I've jumped my fan and both low and high work fine. I've changed the radiator fan sensors with other used ones that previously worked before on the previous car, but my fan still does not come on when my temperature is registering right next to the red zone My temperature guage flickers at times and when I turn on something electrical like my turn signals it flickers more. In addition, when I turn on my air conditioning the guage instantly moves closer to the feared red zone.
My question is whether my temperature guage is bad and I am getting a wrong reading or there is something mechanical going on overheating my new BMW rebuilt engine. I am getting worried as the heat in now 100 degrees in hot California. Any and all suggestions would be greatly appreciated.




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