Hi!

Can anybody tell me length and dia of the 2 heater core hoses for a 1970 Cutlass Supreme 350 with AC?

So far I seem to have have found:

Lower hose (larger): 3/4"
Upper hose (smaller): 5/8"

Replacing my heater I want to buy two new hoses, the two old ones are still in my car some miles away and difficult to measure.

Ed:

While you're at it, what's the inner dia of the PCV hoses going to the charcoal filter can? 1/4"?

 

Upper or to water pump is about 6 ft. or in your case 1.83 meters
Lower or to heater control valve 4 ft. 1.29 meters.

Both or about foot over what you need to be per correct routing but it's better to have to much hose than not enough! Cut to length.

I just did mine about 5 months ago, and have exactly what you have for a car!

Pat

 

Thanks, so 2x 6ft should be enough.

 

More than plenty! I can get you that dimension on that PCV hose in about 4 hrs when I get home!

Pat

 

I am not sure which hose that you are shooting for? But I believe that the pcv hose is 1/2" i.d FYI I did not pull that one off and measure it's 10 degrees F and it's about 35 in the garage so that bugger is a little stiff due to age and ambient temp. But the little hoses leading into the bottom of the air cleaner are measuring .160 of inch at the nipple so 5/32" hose in fraction or 3.968 mm.

Pat

1970 Cutlass Supreme HT coupe
2004 Alero GLS coupe
2011 Equinox LT1 Wife D.D.
2014 Impala LT1 my D.D.

 

I put new hoses on my 72 a few years ago.
PCV hose is 3/8", Charcoal can to tank is 5/16", and charcoal can to carb is 1/4"
Pretty sure those are also right for 70.
A cheap at it is per foot, i always get extra, as it always comes in handy for something!

 

Thanks again. After ordering the coolant hoses I was at the car meanwhile, took measurements and ordered some meters of the charcoal filter hoses. Btw, -3°C in my garage here...

For the record, if anybody stumbles upon this thread:

PCV_hoses.jpg

For me this looks like

PCV: 1/4" (6,53mm)
Fuel tank: 5/16" (7,94mm)
Air cleaner: 3/8" (9,52mm)

 

Sizes are correct but PCV is 3/8" Carb is 1/4"

 

Checked again and I'm confused: Do I have a brain fart here? My middle connector labelled "PCV" is 6,6Xmm - that's 1/4".

3/8 would be ~ 9,52mm, 3/8" - That's the one labelled "Air cleaner"


pcv_filter_connectors.jpg

 

I see what you have! Must be someone added that bugger on! 1970 in the U.S. could exclude California/export? Did not have the charchoal canister.

Pat