Warren, You can call me or email me and I can tell you the difference on the Fan Fix. As far as the dieing at a light there are a couple of things that can be going on. When the ac cycles it may be drawing the voltage down so low the car thinks you have turned it off.The other thing is the rise of the control pulnger in the fuel distributor may be set to lean / low. John Hervey www.specialTauto.com -----Original Message----- From: warren [mailto:kodo@xxxx] Sent: Thursday, May 01, 2003 7:44 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Re: AC fan 3 and 4 positions Does anyone know the difference between the "Fan Fix Dual 2x2", the "Fan Fix One" and the "Fan Fix Two" from http://www.specialtauto.com? Do they all do the same thing? If they do, what is the advantage of paying $129 over $55? Would I still have to replace the circuit breakers and relays if I get one of these products?