93 Radiator Fan turning on very often

[billcu]

Does the 93 ECM programming cause the radiator fan to run more than the other gen 1's? Mine runs more often than my 94's, it doesn't overheat or run hotter than the 94's though. I know the gen 2's are different because they often turn on at red lights when my gen 1's don't. The other possibility is maybe my 93 temperature sensor is off a little compared to the 94's, does anyone know which temperature sensor controls the radiator fan?

 

[driller]

... does anyone know which temperature sensor controls the radiator fan?

As I remember, the drivers side temp sensor in the coolant crossover tube should be the single wire type which is for the instrument panel engine temperature gauge only. The temp sensor on the passenger side with a 2-wire harness connector is connected to the PCM which controls the radiator fan via the VCRM.

I can't say I've noticed the '93 radiator fan running more than others but mine are all modified so that may not be relevant.

It's been a while, but I recall in stock form, the '93 commanded the fan to come on at 215 degrees coolant temperature? You could check the temperature the fan comes on with a IR temperature gun.

 

[billcu]

Thanks JP, I'll check the temp at the crossover.