1959 Water Pump heater hose fittings

[chipgribben]

I'm looking for the inlet and outlet heater hose fittings for the water pump. Or if someone knows the thread size so I can find an aftermarket fitting from Summit or something.

[Cadillac Jack 82]

I'd think you should be able to find some fittings and make them yourself?  Seems like a simple bend that can be done with hand tools.

[PHIL WHYTE CLC 14192]

Try an old fashioned hardware store, I got replacement outlets for my 54 water pump in an Ace hardware in Houston Tx

[59-in-pieces]

Chip,

It is important to know that the size of the hoses coming from and to the heater core and the water pump may be of equal but different sizes, and therefore the fittings may need to be the same or different.
Earlier production cars of 1959 had 3/4" ID preformed heater hoses running from the water pump to the heater core, which were later in production replaced with 5/8" ID hoses.  The 1960 models had 5/8" ID hoses. 

Also, the heater hoses are held down as they cross the valley pan, from the water pump to the heater core, by specialized clamps - see pics below.

Have fun,
Steve B.

[chipgribben]

Thanks Steve. Great info. The molded hoses I see available seem to have one 90 degree bend instead of two. I guess I can just get some heater hoses and route them some way to fit.

I was able to remove the fittings from the old water pump and clean them up. That pump came with the original engine which was included seperately when I bought the car which currently is using an engine pulled from another 59.

When that engine was installed, the water pump outlet and inlet heater ports are currently plugged. i dont know the history of the current engine in the car, it is painted turquise with turquise painted cadillac valve covers. its not the blue engine color. The previous owner didnt provide much history info.

[gkhashem]

Chip,

It is important to know that the size of the hoses coming from and to the heater core and the water pump may be of equal but different sizes, and therefore the fittings may need to be the same or different.
Earlier production cars of 1959 had 3/4" ID preformed heater hoses running from the water pump to the heater core, which were later in production replaced with 5/8" ID hoses.  The 1960 models had 5/8" ID hoses. 

Also, the heater hoses are held down as they cross the valley pan, from the water pump to the heater core, by specialized clamps - see pics below.

Have fun,
Steve B.

That's why when you see those new repro water pumps there is a brass adaptor to cover both sizes.

The repros which I used as a temp fix and I took off for a rebuild lined up with the belts poorly. I thought it would harm my power steering pump.

[dn010]

If the heater lines are plugged or bypassed, you'll more than likely find that the heater core has a leak once you go to put it back together the proper way.

[Cadillac Jack 82]

Silly question but does anyone make repro heater hoses for the 59s?  Or is standard hose fine?  Mine are getting a bit on the dry side and I'd like to replace them sometime soon.

[dn010]

I saw original parts group offers the molded hose for $85 bucks. Don't do that. When I redid the hoses on my 57, I just used regular heater hose for the straight runs. Mine also takes that "$85" hose with the 90 degree bend in it. So I took the old hose off and went to advance auto with it and asked them if I could see what molded heater hoses they had hanging in the back. They agreed to let me go look and compare. I was able to find a hose that was almost identical (just a little longer which of course was no problem since you can cut it) for a modern car. Unfortunately, this was a couple of years ago and I don't have any record of what hose it was that I used. I can tell you it was only $20 compared to 85!

[Clewisiii]

You can actually get reproductions with Cadillac part number stamping. But this is a common standard bent part that is available cheaper.

[gkhashem]

You can actually get reproductions with Cadillac part number stamping. But this is a common standard bent part that is available cheaper.

Those are wrong, as far as I know no one reproduces these.

[Cadillac Jack 82]

Those are wrong, as far as I know no one reproduces these.

How are these wrong?  Sure beats the ol 90s hose thats on there right now.

[Clewisiii]

The way you would call them wrong is that they only have one formed 90 degree bend. But the second bend is more sweeping and not as hard to make up as the sharp 90 coming out of the heater core.

[Clewisiii]

I used the Fusick hoses on mine. But i do not have a heater core yet. Just looped the pipes.



The hardest part was getting the tubes onto the fittings on the back of the waterpump. Especially under the fuel pump. When I finish the install these have to be removed and trimmed on these ends.

[Cadillac Jack 82]

Yeah I'm gonna go with those.  I like them.

[gkhashem]

How are these wrong?  Sure beats the ol 90s hose thats on there right now.

The originals have a more sweeping set of bends. I kept them with my car when I replaced them. Eric DiVirgilis now owns the car and I am sure he kept them. They even had some factory Cadillac blue overspray on them. The car had 39,925 miles when I got it back in 2014.


I replaced them with ribbed GM heater hose that was not preformed but got it to work.

A picture of the hose not with the mold, but this style is correct..

https://johnsclassiccars.com/products/7750-engine-compartment-radiator-related-radiator-hose-heater-hose-camaro-chevelle-el-camino-chevy-ii-nova

Fusick has wrong style and wrong mold but it works.

Many sellers online are pushing these are correct but they are WRONG!