I was wondering if somebody could help me out with a little problem I experienced the last time I had the Chevelle out. I installed an Alumitech radiator/dual electric fan set-up over the winter as well as a new high-flow 180 or 185 t-stat. I also put in a new cam and broke it in, and everything worked properly. I took it for the first drive of the season the other day and everything went well. I then decided to cruise over to my friends house to hang out (about 25 min away) and everything worked well on the way there…temp didn’t go over 190. When I went to go back home a 4+ hours later, I started the car and the fans kicked on right away, which I thought was weird. I started driving and the fans stayed on the entire way home, but he mechanical temp gauge in the car didn’t read anything over 135-140 the whole way home…? Both the mechanical temp gauge and the electric fan coolant sensor are screwed into the intake manifold near the t-stat.

Anybody have any ideas on what is happening here? Bad t-stat? Air in the system? If so, how do you get it out? When I originally filled the radiator, I filled it up almost all the way, ran the car to operating temp with the cap off and then filled up the rest of the way and put the cap on. I’d like to figure this out before I drive much further. Any help would be appreciated.

Go back and check your wiring set up per directions
the fan relays are only kicked on when they sence ground ..from the sensor .. it closes at 195 to ground ..kicks the fans on .. opens at 175 .. if the t/stat is 180 or 185 .. keeping the block/coolant that high it will not let the fans turn off .. there fighting each other .

you may want to check your gage readings with a i/r gun to varify the reading .

sounds like you had a constant ground contact keeping the relays switched on .
did you install a toggle to ground off the sensor to over ride the therm sensor and run the fans at will .. it may have grounded out keeping the fans on

the fact that you had low temps on the ride home is a testament to the efficiency of the rad and fans ...if you were low on coolant or air in the system you would have seen higher temps .

Don
give me a call if you need to