Jmsanch Posted April 10, 2018 Share Posted April 10, 2018 I have a 40 Pontiac Deluxe 28. The ribbed coolant hose going from the thermostat housing to the top of the radiator needs to be replaced. I found one for the 26 series which is the 6 cylinder, so not sure if there are any differences with this car being a straight 8. Does the hose have to be ribbed, did it serve a purpose with coolant flow? My two go to places have nothing for this hose, so hoping not sol on this. Link to comment Share on other sites More sharing options...
poci1957 Posted April 10, 2018 Share Posted April 10, 2018 (edited) The parts manual says 1939-40 all used the same upper hose, part # 502025 and available reasonable at www.pontiacparts.net . Edited April 10, 2018 by poci1957 (see edit history) Link to comment Share on other sites More sharing options...
Guest Posted April 10, 2018 Share Posted April 10, 2018 Ribbed hoses are an abomination. Originally sold as a replacement for molded hose as the wire in the ribbing prevented the hose from kinking. Also if used as a lowere hose it would not collapse under suction. One thing the ribbed hose does is to slow down the flow of the coolant therefore contributing to overheating if you system is marginalized to begin with. Link to comment Share on other sites More sharing options...
Jmsanch Posted April 11, 2018 Author Share Posted April 11, 2018 Ok thanks for the info @poci1957 I went ahead and ordered the hose from Pontiac Parts. @Tinindian yeah I questioned that hose as well. Especially since it was so hard to find, and every alternative didn't have ribs. But, figured I would ask anyway just in case the ribs actually served a purpose. Link to comment Share on other sites More sharing options...
Summershandy Posted April 12, 2018 Share Posted April 12, 2018 I have the ribbed hoses and planned on replacing them before summer. I thought they looked retro but in light of this conversation, I too think I'll be ordering the new ones from CPR if they are smooth wall. Who needs added flow restrictions?? I just remembered using the ribbed part of paper straws on my model cars as rad hoses! Link to comment Share on other sites More sharing options...
poci1957 Posted April 12, 2018 Share Posted April 12, 2018 On 4/11/2018 at 8:53 AM, Jmsanch said: Ok thanks for the info @poci1957 I went ahead and ordered the hose from Pontiac Parts. @Tinindian yeah I questioned that hose as well. Especially since it was so hard to find.........figured I would ask anyway just in case the ribs actually served a purpose. Good idea, hopefully you ordered the lower hose too to replace at the same time, the prices are reasonable. As Tinindian said the ribbed hoses are considered a low-dollar off-brand replacement part; molded curved hoses are the proper thing to do if available, Todd C Link to comment Share on other sites More sharing options...
Summershandy Posted April 26, 2018 Share Posted April 26, 2018 So I ordered and received my hoses today in light of the conversation. Funny that they are identical but sold as upper and lower. Looks like they are oversized so you can trim to fit. They are curved and moulded as Todd mentioned. They seem rather flimsy. Will I have any collapsing issues? Link to comment Share on other sites More sharing options...
poci1957 Posted April 26, 2018 Share Posted April 26, 2018 1 hour ago, Summershandy said: ......they are identical but sold as upper and lower. Looks like they are oversized so you can trim to fit. They are curved and moulded as Todd mentioned. They seem rather flimsy. Will I have any collapsing issues? Cut to fit is OK, tinindian is correct that cars often had the spring inserted in the hose to prevent collapsing under suction, see photo. They have been eliminating them for years (probably to save a buck) and I rarely see them anymore; a quick search did not show them available separately from the parts stores. Maybe someone else knows if they are available as a general replacement part, Todd C Link to comment Share on other sites More sharing options...
Summershandy Posted April 26, 2018 Share Posted April 26, 2018 That sucks (or collapsible if you will). What type of hose are you using Todd? Is it my understanding the hose that may collapse is the lower? I could always keep the lower ribbed and replace the upper. I still have both ribbed hoses. Link to comment Share on other sites More sharing options...
poci1957 Posted April 26, 2018 Share Posted April 26, 2018 I would rather take my chances without a spring then be seen with a ribbed hose. It is possible your original spring may still be in place, if so it can be reused if it is still in acceptable condition Link to comment Share on other sites More sharing options...
Summershandy Posted April 26, 2018 Share Posted April 26, 2018 The hoses that came with the car are ribbed with springs inside. Because of your suggestion I went out to the garage to see if the spring can be removed from the ribbed hose....and it can by unscrewing it with help from needle nose vise grips and a shot of WD. I thought maybe they were moulded inside or something making them permanent. The old spring also looks like it can be fitted in the new molded hose! Hopefully there's no chance of the spring moving up or down the hose. The ribs in the old hose hold the spring in place. The old spring cleaned up nicely. Regardless, I think I can make it work. Thanks for the push. This is awesome news! Link to comment Share on other sites More sharing options...
1956322 Posted April 29, 2018 Share Posted April 29, 2018 It is my understanding.. Working in the auto parts industry that they have done away with the springs inside molded hoses because they are no longer needed.. At least with a quality brand such as gates... All the hoses I have bought for my classics have been gates with no hint of a problem Link to comment Share on other sites More sharing options...
PETEPONTIAC-1 Posted April 29, 2018 Share Posted April 29, 2018 You can go to a local auto parts store and they sell hose by the foot. If you go to O'Reilly they have a GATES coolant hose 1 3/4 Inside diameter part # 24028. NAPA part # NBH 611. FYI Link to comment Share on other sites More sharing options...
Summershandy Posted April 29, 2018 Share Posted April 29, 2018 28 minutes ago, 1956322 said: At least with a quality brand such as gates. I'm familiar with gates. My replacement hoses are stamped MADE IN THE U.S.A. and I cannot find anything more info on them plugging in all the numbers on the hose. When I replaced rad hoses on another rebuild I was doing, I had no concern on "collapsing" hoses. I'm starting to think, am I TOO concerned about it? It's just I don't know about the old straight 8's and how they act. Link to comment Share on other sites More sharing options...
1956322 Posted April 30, 2018 Share Posted April 30, 2018 Made in USA could definitely be gates or maybe dayco...I wouldn't lose any sleep over it but of course keep an eye on things? Link to comment Share on other sites More sharing options...
Guest Posted April 30, 2018 Share Posted April 30, 2018 A hose that needs a spring in it to keep it from collapsing is a hose that should have been replaced. Most hoses that are replaced are many many months or years past their best by date. Link to comment Share on other sites More sharing options...
Summershandy Posted April 30, 2018 Share Posted April 30, 2018 2 hours ago, 1956322 said: .I wouldn't lose any sleep over it I'm my worst critic, a perfectionist usually over thinking things and lose sleep over such subjects as this....I call it a curse LOL. Glad for the feedback as always! Link to comment Share on other sites More sharing options...
1956322 Posted April 30, 2018 Share Posted April 30, 2018 Oh I understand lol Link to comment Share on other sites More sharing options...
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