Stefano Pasini

 


October 2011. The 'new' 16" single radiator pusher fan fitted in place of the original twin Kenlowes in June didn't cure the tendency to overheat of the big Chrysler, and the Otter switch kept it more or less on all the time, so it sounded like if I had installed a small, effective air-raid siren under the hood. This, clearly, was not satisfying, though we had no overheating problems during the journey to and from Goodwood. Therefore, when I was back, I decided to take some radical steps to cure the problem once and forever. The original radiator was therefore removed and rebuilt; a larger 'puller' fan with curved blades and a proper cowling was fitted instead.

The top picture shows the fan installed on the radiator and the new sensor; the bottom one shows the assembly installed in the 409. It's quite nice, I think, and it works wonders.

I must also thank once again mr Brian Marelli who kindly located the correct bottom hose for the radiator of my car (it's different from the one used in the 408s and non-power-steering 409s) to replace the old tired one. Bristol owners are lucky to have such a nice and knowledgeable chap assisting us in the maintenance of our cars



Jult 2012: the large shroud of the new powerful fan keeps the engine temperature under control even in long queues under the scorching Italian summer (this year we saw 42C quite often....) but the airflow at speed is not so good. Probably, as the fan is offset to the right, the large L/H plastic panel slows the airflow building heat in that part of the rad. Gordini's remedy was to cut three 'windows' in the shroud fitting heavy rubber curtains so that they will be pushed open by the air at speed, but the suction action of the fan will shut them down, sealing the shroud and maximizing its efficiency, when the car is stopped in a queue and the fan is operating. Result: temperature never climbing over 95C, just what we wanted