Grizzly Posted May 16 Report Share Posted May 16 Good afternoon, I am about to embark on the installation of a modern Air Con system in my 1978 Elite 503. The original system was removed before I got the car and all I have is the original Heater / A/c evaporator unit, which is neither of the ones shown in my manual. I believe it is the later Lotus version, details of which I cannot find. My first problem is been to identify the threaded connections on the unit. There is a Daddy Bear, Mother Bear and Baby Bear ( so to speak). The Baby Bear connection is redundant on a modern system. Both the Mummy Bear and Daddy Bear have the same metric thread of 1.75, but neither are M12 fittings. Further research has brought up a 1 and 5/8 UNC possiblity, but it doesn't make sense either. Any guidance to there identification would be a great help. Thanks Brian Quote Link to comment Share on other sites More sharing options...
EXCEL V8 Posted May 16 Report Share Posted May 16 I can find out the thread data for the early Delanair evaporator if it will help - I'll dig out my spare unit and take some measurements (forgotten them!! - old age 🙄). ISTR they are 7/8" UNF and 5/8" UNF, but I'll check. Pete Quote Link to comment Share on other sites More sharing options...
Grizzly Posted May 20 Author Report Share Posted May 20 The greater of the two connection is masquerading as 7/8 unf and the smaller as 5/8 unf. However neither will take a standard nut. The o.d of the male threads on the unit are greater than the i.d of a standard nut. I can find no equivalent swivel nut hose connection on the internet. Is there any one out there with unwanted hoses for this unit. I don't need the hoses as I will fit new, just the 90degree swivel nut ends. Quote Link to comment Share on other sites More sharing options...
EXCEL V8 Posted May 20 Report Share Posted May 20 I make up my own hoses using Eaton EZ Clip fittings. Perhaps have a look at T7Design's site. Have you asked at your local Pirtek yet? How about Car Builder Solutions? Pete Quote Link to comment Share on other sites More sharing options...
Grizzly Posted May 20 Author Report Share Posted May 20 I tried car builder solutions but the components they offer are modern and don't work. I am now trying commercial transport and refrigeration companies. Still think getting original parts is my way out of this Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.