Hello all,
I'm in the process of trying to find the upper radiator hose for our 403 (we still have the original hose on it!). I've confirmed the original part # which is 2015466, however I'm unable to cross reference this part number anywhere. The chart on this page doesn't have the part numbers for the 403: http://gmcmotorhome.info/radiator.html. Does anybody have a Gates, Goodyear, or another brand part number for it? Thanks in advance for the help!
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Chris

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=162592&rid=2083&srch=cut+off+radiator+hose#msg_162592

Hello all,
I'm in the process of trying to find the upper radiator hose for our 403 (we still have the original hose on it!). I've confirmed the original part # which is 2015466, however I'm unable to cross reference this part number anywhere. The chart on this page doesn't have the part numbers for the 403: http://gmcmotorhome.info/radiator.html. Does anybody have a Gates, Goodyear, or another brand part number for it? Thanks in advance for the help!
--
Chris

I just posted on this a couple of months ago. Use the search function. The interchange number hose looks very different than the original but works much better and won't sag on the alternator belt. Cut 1" of the thermostat end and you will have a better hose than the original.

I just posted on this a couple of months ago. Use the search function. The interchange number hose looks very different than the original but works much better and won't sag on the alternator belt. Cut 1" of the thermostat end and you will have a better hose than the original.

Bob de Kruyff wrote on Tue, 26 May 2015 22:55

I just posted on this a couple of months ago. Use the search function. The interchange number hose looks very different than the original but works much better and won't sag on the alternator belt. Cut 1" of the thermostat end and you will have a better hose than the original.

Bob,
Got the upper hose on (cut) and it fits great. It runs pretty close to the floor but it looks like it's not enough to cause any problem. I am not able to find the other post about how to cut the bottom (lower) hose. I'm considering replacing that one as well. I see that the Gates 22125 is the one. Which end and approx. how much did you have to cut off of it? Thanks!!
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Chris

Chris, I'm glad it worked for you. I didn't replace the lower hose so I have no input on that one.

OK thanks Bob, hopefully somebody might know on the bottom one. In the other post (below) I see that they had to cut 1" and 3" off the ends, but I don't have the original hose to use as a template. I can probably wing it but if anybody knows how much needs to be cut off each end, that would be helpful.

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=162592&rid=2083&srch=cut+off+radiator+hose#msg_162592

After this is done I'd like to post all of this in one place to help others in the future as it's a pretty common procedure.

Thanks again!
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Chris

455 or 403?

Thanks to everybody for all of the feedback, and information. I decided to write up instructions for replacing these hoses as I know I'll forget the next time and hopefully it will help others as well.

Upper hose:
Use the Gates 20991 hose
The end that has the sharper bend in it, is the end that goes on the water outlet. The end with the more gradual bend goes on the radiator.
Cut 0.75" from the end that attaches to the water outlet at the engine.
Hose should go on and clear everything including belts, fan, etc. It does run close to the floor so additional protection or a guard on the hose may be necessary.

Lower hose:
Use the Gates 22125 hose
The end with the longer side goes on the radiator. The end with the shorter side goes on the water pump.
Cut 2" from the shorter end (water pump side). Cut 4.5" from the longer end (radiator side).
Hose should go on easily and clear the belts, trans and fuel lines, etc.

Pictures of parts posted here:
http://www.gmcmhphotos.com/photos/g6799-radiator-hose-replacement.html