If the 68 is like the 58 there is a slip ring style of brush that runs at the back of the clutch/pulley this is the conductor that actuates the clutch .My brushes had burnt out ,it was a simple enough job to epoxy a pair of new brushes from a modern electric motor into the unit ,as we have know parts down here .On that note I have a need for a front of crank shaft seal for the compressor on my 58 any ideas .A store with a web sit and on line orders would be nice .It makes things easier for this part of the world .HOPPY ----- Original Message ----- From: "Print Bear" <prntbear@xxxxxxxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Sunday, April 27, 2003 8:56 AM Subject: Re: IML: 68, R134 conversion > I would like to recharge my '68 Auto Temp. I will have to use the R134. > The controls seem to be working properly and the heat and cool happen > through the correct ducts however, the compressor doesn't ever engage. > Is there a pressure switch that would be preventing the clutch to > operate due to low freon? I have checked and all the fuses are good and > the fan is operating automatically. > > >