Well I checked the thermostat sender for you. It is an open circuit when cold and a closed circuit when hot. I didn't have a master gauge, so I can't tell you what the switch temp is but it is a bit hotter than I set my thermofans at. But then again I am still running the standard RA28 radiator and it does struggle on a really hot day, so I err on the side of conservative with the temps. My thermo fans come on at about 1/3 of the temp gauge, whereas this sender triggers at about 1/2 gauge. Incidently the Gen 3 soarer temp sender is compatable with the RA28 gauge whereas the Gen 2 supra one wasn't. It read too low and needed to be changed to get a reasonable reading. I just used a RA28 sender on the Gen 2 motor.
This is the Gen 2 supra (mid sump) thermostat housing
and this is the Gen 3 Soarer (front sump) thermostat housing.
Notice the blue plug on the lower forward part of the housing. The supra has the same casting, it just doesn't have the sender installed.
Wed, 31 March 2004 11:25
