1975 L-48, 4 speed with A/C Heater hoses?

[Tom R.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

Both hoses had the same grooves. They also had the GM logo- lacquer thinner works great!
Jeff

We have a group working on a revision for the 75-77 manual and have yet to find a heater hose with the GM logo on any of the three pieces...ribs yes, molded ends for the heater core -yes, GM logo no!

[Tom R.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

All------


The number of ribs or grooves on the hoses was a code which denoted the hose manufacturer. I don't know that they were required if the manufacturer was otherwise identified by a code printed on the hose.

Joe
A technical detail, but coolant is pushed from the pump through the 3/4" hose to the heater core and returns to the manifold. I ask because references (hoses) call the 3/4" hose the outlet, meaning a return from the heater core. So the orientation of hoses is to the heater core.

[Jeffrey S.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

We have a group working on a revision for the 75-77 manual and have yet to find a heater hose with the GM logo on any of the three pieces...ribs yes, molded ends for the heater core -yes, GM logo no!

When I jokingly said that lacquer thinner works great, I hope you understood that I meant to remove the GM logo. The 6th edition of the 68-69 judging guide says that the hoses had no GM logo but had white letters DL, EB, U, JT, and X. After removing the logo I had a rubber stamp made with one of these ( I can't remember which) and stamped them with white ink. Got full credit at the Novi national event.
Jeff

[Lynn S.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

Thanks everyone for your replies. I spoke with the vendor New York Restomod and he had the correct hoses. Have a great week and be safe out there.

[Jeffrey S.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

Glad to help.
Jeff

[Edward J.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

When I jokingly said that lacquer thinner works great, I hope you understood that I meant to remove the GM logo. The 6th edition of the 68-69 judging guide says that the hoses had no GM logo but had white letters DL, EB, U, JT, and X. After removing the logo I had a rubber stamp made with one of these ( I can't remember which) and stamped them with white ink. Got full credit at the Novi national event.
Jeff

Hi Jeff, I was wondering if you can post a pic of the letter stamp I was thing of using the U stamp on my hoses ( ordered the molded hoses w/grooves) which way was the U facing length wise? What was the distance between stamps. I have a comp. that can make a stamp. Thanks Ed

[Jeffrey S.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

Hi Jeff, I was wondering if you can post a pic of the letter stamp I was thing of using the U stamp on my hoses ( ordered the molded hoses w/grooves) which way was the U facing length wise? What was the distance between stamps. I have a comp. that can make a stamp. Thanks Ed

Ed,
I would be happy to send a photo and information you need. It will have to wait until Friday as tomorrow is Grandpa day in Ann Arbor.
Jeff

[Terry M.]

Re: 1975 L-48, 4 speed with A/C Heater hoses?

There are only two "U's" on the heater hoses on my 1970 LT1, and as best I remember they are stamped only on one hose. No pictures at this time.

I would expect a different code for other engines and/or heater hose configurations.