I just couldn't take it any more! - Moparts Forums

Register Log In Moparts Forums Sandy's Truck Shop I just couldn't take it any more!

Print Thread

I just couldn't take it any more! #1560462 01/07/14 04:09 PM 01/07/14 04:09 PM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power OP master
bigblock340power OP master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	When I got my truck, someone had put these "red" heater hoses on it. They worked Ok, but the one on the bottom of the heater valve is supposed to be 1/2" line from the intake manifold to the heater valve. All the others were 5/8". The one that was to big hose kept leaking in different ambient temps. So I put the correct hoses on today. I think it looks a whole lot better. I have a question though. Why is the hose coming from the intake nipple to the heater valve 1/2" anyway? On the other side of the valve it is 5'8" to the heater core tube. Something to do with slowing the water down to get better heat to the heater core? Anyone The old hoses. The new ones.

Re: I just couldn't take it any more! [Re: bigblock340power] #1560463 01/07/14 06:07 PM 01/07/14 06:07 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	No. The water flow through the heater core is determined by the total resistance of the system, including the resistance of the valve. Hydraulically it makes little sense to have two diffeent sizes on the intake line, the very slightly smaller flow resistance of the larger hose d/s of the valve makes miniscule difference. The reason could be way beyond your imagination, such as: 1. Pre-existing heater core with two 5/8" nipples, change is expensive and not worth it, or: 2. With two nipples the same size either hose could hook to either nipple for easier assembly, or: 3. Running change to the nipple size on the water pump, or: 4. Smaller line adds enough restriction to prevent the water pump from going into cavitation. See what I mean? If I had long enough time I could come up with a half dozen more reasons that would be perfectly legitimate to a designer. R.

Re: I just couldn't take it any more! [Re: dogdays] #1560464 01/07/14 06:24 PM 01/07/14 06:24 PM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power OP master
bigblock340power OP master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	Quote: No. The water flow through the heater core is determined by the total resistance of the system, including the resistance of the valve. Hydraulically it makes little sense to have two diffeent sizes on the intake line, the very slightly smaller flow resistance of the larger hose d/s of the valve makes miniscule difference. The reason could be way beyond your imagination, such as: 1. Pre-existing heater core with two 5/8" nipples, change is expensive and not worth it, or: 2. With two nipples the same size either hose could hook to either nipple for easier assembly, or: 3. Running change to the nipple size on the water pump, or: 4. Smaller line adds enough restriction to prevent the water pump from going into cavitation. See what I mean? If I had long enough time I could come up with a half dozen more reasons that would be perfectly legitimate to a designer. R. All valid reasons I guess. But I still wonder what Ma Mopar was thinking?

Re: I just couldn't take it any more! [Re: bigblock340power] #1560465 01/07/14 06:31 PM 01/07/14 06:31 PM
Joined: Jan 2003 Posts: 32,928 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,928 Grand Prairie,Texas	Ma Mopar thinking, "how can we save some pennies and confuse people 30 years in the future?"

Re: I just couldn't take it any more! [Re: bigblock340power] #1560466 01/07/14 09:16 PM 01/07/14 09:16 PM
Joined: Apr 2010 Posts: 10,570 Sunny South Florida Golden-Arm I Live Here
Golden-Arm I Live Here Joined: Apr 2010 Posts: 10,570 Sunny South Florida	probably thinking you couldn't accidentally reverse the flow, while doing an r&r on the system, by forcing you to use two different size hoses. "When Tyranny Becomes Law, Rebellion Becomes Duty"

Re: I just couldn't take it any more! [Re: Golden-Arm] #1560467 01/07/14 10:41 PM 01/07/14 10:41 PM
Joined: Jun 2003 Posts: 3,325 Truckville, the capital of NY 85_Ram_4speed master
85_Ram_4speed master Joined: Jun 2003 Posts: 3,325 Truckville, the capital of NY	THANK YOU for getting rid of the red hose. That just absolutly drives me insane. I can deal with the blue and green silicone hose though for some reason. Plain old black just seems to look the best. Outcast Dodge guy.

Re: I just couldn't take it any more! [Re: Golden-Arm] #1560468 01/07/14 10:46 PM 01/07/14 10:46 PM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power OP master
bigblock340power OP master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	Quote: probably thinking you couldn't accidentally reverse the flow, while doing an r&r on the system, by forcing you to use two different size hoses. You couldn't accidentally reverse the flow? If you used the right size hose in the right place. I think you could, if you used the same size hose as the person before me did. Yes, they seamed to get it right, but using the same size hose, it could be messed up. I think they used the same size hose on all the ports cause it was a lot easier to do so than going back to the store and get the right hose.

Re: I just couldn't take it any more! [Re: bigblock340power] #1560469 01/08/14 12:47 AM 01/08/14 12:47 AM
Joined: Jan 2003 Posts: 10,555 Freeport IL USA poorboy I Live Here
poorboy I Live Here Joined: Jan 2003 Posts: 10,555 Freeport IL USA	I suspect the 1/2" hose was because the nipple on the water pump requires a 1/2" hose. That water pump with the same features covering many years, and in the early years, many of the heater cores had either a 1/2" nipple and a 5/8" nipple, or a pair of 1/2" nipples. Gene

Re: I just couldn't take it any more! [Re: bigblock340power] #1560470 01/08/14 04:55 AM 01/08/14 04:55 AM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	Ma Mopar probally decided to change the inlet and outlet sizes of the hoses to make sure the coolant routing on the hoses was done correctly at the factory and later on when the vechicles got older and needed the hoses changed. I'm not sure exactly if it was 1969, 1970 or 1971 when the factory did away with the same sizes hoses for the inlet and outlet on the ehaters, all those before the change had the same sizes hoses for both in and out The air condition vechicle had those heater control valves but the non air vechicles didn't and it wasn't hard to mix thoses hoses up on any of the early motors with the hoses sizes and inlet and outlet fittings the same sizes Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: I just couldn't take it any more! [Re: Cab_Burge] #1560471 01/08/14 05:12 AM 01/08/14 05:12 AM
Joined: Aug 2006 Posts: 8,064 Iowa 76dodgeboy master
76dodgeboy master Joined: Aug 2006 Posts: 8,064 Iowa	Does it really matter which way it flows through the heater core?

Re: I just couldn't take it any more! [Re: 76dodgeboy] #1560472 01/08/14 07:04 AM 01/08/14 07:04 AM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power OP master
bigblock340power OP master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	Quote: Does it really matter which way it flows through the heater core? Oh yes! The whole cosmic universe would implode!! You heard of the big bang? That guy mixed them up.

Re: I just couldn't take it any more! [Re: 76dodgeboy] #1560473 01/08/14 11:07 AM 01/08/14 11:07 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	Quote: Does it really matter which way it flows through the heater core? on my non-a/c 68 DART it had two 1/2" lines with no valve, water flowed all the time. heater box closed the air/heat off. over the yrs I know I reversed the flow thru the core a couple times patching up the hoses or with an engine R&R. allways worked with plenty of heat, even during the summer. I remeber thinking why is there no valve on it when I got it... maybe it was MIA?

Re: I just couldn't take it any more! [Re: dogdays] #1560474 02/02/14 05:43 PM 02/02/14 05:43 PM
Joined: Jan 2003 Posts: 5,789 Hamilton, Ontario Canada Magnum master
Magnum master Joined: Jan 2003 Posts: 5,789 Hamilton, Ontario Canada	Quote: reasons that would be perfectly legitimate to a designer. R. Just because they did it. Doesn't mean it makes sense. Cars evolved over the years and some methods were left behind. That particular designer was probably the same designer than called for Ammeter gauges and negative caster. I'm sure he was fired soon after. 69 Super Bee, 93 Mustang LX, 04 Allure Super

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1