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Author Topic: 1968 cadillac deville radiator heater return line??  (Read 1389 times)

Offline johnnymoon

  • Posts: 5
  • Name: Johnny
1968 cadillac deville radiator heater return line??
« on: May 19, 2015, 08:54:28 PM »
Hello,

I am new here. So i just wrecked my 68 deville convertible screwed up the front end  :o I know! I am a novice when it comes to under the hood stuff but I am eager to learn. I busted the radiator in my wreck and just got a replacement radiator that has no heater return line. Here comes the dumb question...can i bypass the heater return line some how? and whats the function of the heater return line ? Any help would be much appreciated!

Thanks
-Johnny
« Last Edit: May 19, 2015, 09:07:36 PM by johnnymoon »
J Mooney

Offline 35-709

  • Posts: 5365
  • The most valuable antique is an old friend.
  • CLC Number: 4719
  • Name: G. Newcombe
Re: 1968 cadillac deville radiator heater return line??
« Reply #1 on: May 19, 2015, 10:09:20 PM »
" ... can i bypass the heater return line some how? and whats the function of the heater return line ?"

If you want heat, hot water must be able circulate or none will get to your heater core.  Hot water in, cooler water out.  Get a proper radiator (easy to find at Rockauto.com) or talk to your local radiator shop about adding a fitting to your current radiator --- also relatively easy --- after you take the radiator back out.   ;D
1935 Cadillac Sedan resto-mod "Big Red"
1973 Cadillac Caribou - Sold - but still in the family
1950 Jaguar Mark V Saloon resto-mod - Sold
1942 Cadillac 6269 - Sold
1968 Pontiac Bonneville Convertible
1935 Glenn Pray - Auburn Boattail Speedster, Gen. 2

Offline Koolminx

  • Posts: 28
  • Name: Gary Kitchens
Re: 1968 cadillac deville radiator heater return line??
« Reply #2 on: February 03, 2021, 12:59:49 PM »
This is a 7 year old thread, but I've found NO supplier that has a radiator WITH the heater return line....   It's frustrating, and it's the side tank not my core that's leaking, so I reckon I'm skrewt on this.

Offline TJ Hopland

  • Posts: 10193
Re: 1968 cadillac deville radiator heater return line??
« Reply #3 on: February 03, 2021, 01:10:17 PM »
Seems like something an old school radiator shop should be able to repair if you can find one.

Did you look up US Radiator?    For the money they get for theirs you would think they could build them with the correct fittings?

What is unique about the 68?   Didn't most of the Cads of the era and some other GM's have that return line?   I got a modern plastic aluminum one in my 73 and its got the return port. 
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
80 Eldo Diesel
90 CDV
And other assorted stuff I keep buying for some reason

Offline dn010

  • Posts: 338
  • CLC Number: 33004
  • Name: Dan Benedek
Re: 1968 cadillac deville radiator heater return line??
« Reply #4 on: February 03, 2021, 04:36:21 PM »
The newest Cadillac I've ever owned was a 65 so I am no expert on the 68, but can one not tap into the cooling system elsewhere to return the coolant? RadiatorExpress seems to have the correct radiator otherwise.
-----Dan Benedek
'57 Cadillac Sedan Deville 6239DX
'81 DMC DeLorean

Offline Koolminx

  • Posts: 28
  • Name: Gary Kitchens
Re: 1968 cadillac deville radiator heater return line??
« Reply #5 on: February 05, 2021, 10:56:11 AM »
I managed to make it correct for this 68 by buyint the new tank they have copper brass, and havint them remove the tank and solder my nipple into it, the other incorrectness is the trans cooler line fittings atre 5/16" compression fittings but the 68 Deville has 3/8" compression fitting lines so adapters are necessary and the overflow hose connection is clocked incorrectly but it's still useable.

Offline TJ Hopland

  • Posts: 10193
Re: 1968 cadillac deville radiator heater return line??
« Reply #6 on: February 05, 2021, 11:06:46 AM »
Anyone know what is unique about a 68?     Is it something like 66-75 is all the same except for the location of that nipple so the people that make em figure they will just go with close enough to fit the most cars?

Finding a copper brass one that isn't right seems even stranger since the people still making those tend to be more collector oriented.
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
80 Eldo Diesel
90 CDV
And other assorted stuff I keep buying for some reason

Offline hornetball

  • Posts: 827
  • CLC Number: 32697
  • Name: R. Price
Re: 1968 cadillac deville radiator heater return line??
« Reply #7 on: February 05, 2021, 02:07:33 PM »
When I bought my new radiator for the '74 Eldo (Vista-Pro 433165), it had the same issues . . . heater return was 5/8" instead of 3/4" and filler neck nipple clocked incorrectly.  The application is common to a large number of GM cars and listed as fitting the '71-'74 Eldos.  It bolted in perfectly.  I took it to an old school radiator shop and got the above 2 issues resolved.  Since the radiator was brass/copper, the radiator shop had no issues and the corrections were inexpensive.

Kirby Radiator in Fort Worth for those of you in N. Texas.  First rate radiator shop.

Offline Highwayman68

  • Posts: 632
  • 68 Fleetwood Brougham
  • CLC Number: 29574
  • Name: Mark Demyan
Re: 1968 cadillac deville radiator heater return line??
« Reply #8 on: February 06, 2021, 08:58:46 AM »
I had my tanks reused to have a new one made. It avoided all of these issues. Any old-tyme shop can repair the tanks.
1968 Fleetwood Purchased in 1981

 

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