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Heater Hose Quick Disconnects 01 Silverado
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n5xl
Ok, 2001 5.3 ECSB 4WD Silverado...140,000 miles
Getting ready to do some PM'ing this weekend. Determined last week that the water pump is leaking on the passenger side where it bolts up to the block. No big deal, common problem from what I can tell in searching around the internet. Got the water pump and just waiting on the time to do it, besides, the miles made me think it was ready to go anyway. Even though the hoses look good, I'll change them out. No big deal...normal PM to me.
I see that the heater hoses have quick disconnects where they attach to the heater core (not to mention one has a plastic Y fitting in it where it hooks up to the water pump). I also notice that the quick disconnects are different colors. One is white and one is black. So I go to the dealer to pick up the quick disconnects and one is double the price of the other one. The dealer couldn't tell me the difference in the two, but did say that "these can go anytime after 100,000 miles. Its common enough that we keep a decent stock of them." While I didnt ask while I was there, I later found out that the dealer heater hose...the one with the plastic Y fitting, supposedly has the quick disconnect fitting already pre attached. The heater hoses that are aftermarket do not have the quick connector on them and you are supposed to either reuse the old ones or get new ones like I did.
So my question is, what is the difference between the two QD's? I have both parts in hand and besides the color, I cant tell any difference in them. Where the heater hose goes over the fittings, "mikes out" as 0.6265....standard 5/8 heater hose size. The ID of the hose fitting where the hose goes are both 0.4520". The seal inside the fitting that seals against the heater core is also the same ID on both. My caliper says that they are both 0.6870 with the caliper JUST TOUCHING the sealing face. I'm guessing that the heater core is probably 3/4 but I have not checked it yet to verify the exact size. So...why the difference in color and in price if they are both physically the same dimensions?
GM Part numbers 15151875 and 15032026
Dave
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