To address comments privately to the moderating team, please address: moderator@xxxxxxxxxxx To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews ------------------------------------------------------------------------ There are 2 messages in this issue. Topics in this digest: 1. Re: A/C cycling switch From: "DMC Joe" <dmcjoe@xxxxxxx> 2. Re: Schematic for fan/relay From: "DMC Joe" <dmcjoe@xxxxxxx> ________________________________________________________________________ ________________________________________________________________________ Message: 1 Date: Sat, 23 Mar 2002 00:20:01 -0500 From: "DMC Joe" <dmcjoe@xxxxxxx> Subject: Re: A/C cycling switch Mike, Walter is correct in his response to your question. I would like to add that the statement you quoted from the article that said "if adjusting the switch makes no difference then you should replace the switch". This is completely wrong. The AC Cycle Switch, which is correctly named the Low Pressure Cut Off Switch, is factory calibrated and the adjustment should not be tampered with. Excessive cycling of the AC compressor is almost always caused by an insufficient level of R-12. As Walter said the engage or "on" time of the compressor should be no less than 7 seconds with the engine RPM at 3000. If you have tampered with the switch you should replace the switch and add freon until the compressor cycles within the above mentioned time period, DMC Joe/Help Club dmchelp@xxxxxxx Information & Store http://shopping.oraclesmallbusiness.com/dsvstore DeLorean Website Directory www.dmc.tv ________________________________________________________________________ ________________________________________________________________________ Message: 2 Date: Sat, 23 Mar 2002 00:26:54 -0500 From: "DMC Joe" <dmcjoe@xxxxxxx> Subject: Re: Schematic for fan/relay It appears from your request that you are not very familiar with the DeLorean cooling fan circuit. Several years ago I wrote an extensive article on this subject and it appears that it vanished when we moved our web site to a new server. I'll try to explain in as few words as possible. All DeLoreans were equipped with a cooling fan control circuit module called the Fan Fail Module. Its main function was to illuminate the console mounted Fan Fail warning lamp to alert the driver that one or both of the cooling fans were drawing excessive current. The wiring design called for both cooling fans to receive their power from the Fan Fail Module. Shortly after production began dealerships and owners were reporting complete cooling fan failure. I t didn't take long before it was discovered that the Fan Fail module contained components that could not handle the very high amperage drawn by the cooling fans. The result was Fan Fail Modules were melting in their sockets which in turn rendered the fans inoperative. Its like having a fire extinguisher filled with gasoline. So what resulted were DeLoreans that would overheat with no warning to the driver. Several of these incidents resulted in permanent engine damage. As these reports increased the factory issued a modification that completely eliminated the Fan Fail Module. This left the driver with only the temperature gauge to warn of an impending overheat problem. FanZilla to the rescue! This wonderful device created by Bob Zilla and marketed by PJ Grady and DeLorean Services solved all of the module failure problems and additionally made the entire cooling fan system more efficient and extremely reliable. Getting back to your post the fans should normally cycle depending on weather or not the engine temperature or AC is calling for their assistance. Rather than asking your mechanic to modify your cooling fan circuit you should just purchase the FanZilla and plug it in yourself and save the labor charge. There is a less expensive solution called the Fan Fix from Special T Automotive and although it does not have a fan sequencing circuit it will greatly improve the reliability of the cooling fan circuit. If you are still interested on the cooling fan circuit wiring diagram you will find it at M:18:10 in your workshop manual. No circuit information was ever published for the Fan Fail Module. This is probably the longest message I have ever posted to the list, and I hope it's the last, (very long that is.) DMC Joe/Help Club dmchelp@xxxxxxx Information & Store http://shopping.oraclesmallbusiness.com/dsvstore DeLorean Website Directory www.dmc.tv ----- Original Message ----- From: <RJRavalli@xxxxxxx> Subject: [DML] Schematic for fan/relay > I am looking to have my mechanic replace my water pump and set the fan to cycle instead of staying on constantly. Which DeLorean manual should I get for him to have if he is going to be checking and dealing with the fan relay? I would rather him do this properly instead of messing around and doing something else to give me headaches in the future. > > Thanks for any advice, > > Richard ________________________________________________________________________ ________________________________________________________________________ Your use of Yahoo! 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