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I bypassed the 3 way valve,and converted back to the earlier molded heater hoses Ed.I just left the valve plugged in,and never had any codes.
I'm not sure I want to go through deleting the TMU just yet.
You can leave the TMU in place,and still convert back to the older molded hoses,that only feed the heater core.Alot less hoses to leak,and i noticed better output out of the heater on colder days,might not be anything you'd worry about in Florida,but in Canada better heater output means alot,lol
No it doesn't have to feed the transmission,the cars and 3/4 ton trucks with the 8 speed don't feed coolant to the transmission,only the 1500's feed coolant to the transmission.They have to get that last little .02 mpg out of the 1500's you know,as it's their best selling vehicle,lol.You can disconnect the hoses feeding the 3 way valve,and run from the engine to the heater core.A lot less hoses to develop leaks,and it removes any possibility of the TMU developing a leak and feeding coolant into the transmission.It's not a very common issue,but there have been reports of the tmu leaking coolant into the transmission,and taking the tranny out in very short order. Being as you're in Florida Ed,you don't really need the engine coolant heating the tranny fluid. If the cars and HD trucks don't need to heat the tranny fluid,the 1500's don't either
Got a sketch of what goes where?No it doesn't have to feed the transmission,the cars and 3/4 ton trucks with the 8 speed don't feed coolant to the transmission,only the 1500's feed coolant to the transmission.They have to get that last little .02 mpg out of the 1500's you know,as it's their best selling vehicle,lol.You can disconnect the hoses feeding the 3 way valve,and run from the engine to the heater core.A lot less hoses to develop leaks,and it removes any possibility of the TMU developing a leak and feeding coolant into the transmission.It's not a very common issue,but there have been reports of the tmu leaking coolant into the transmission,and taking the tranny out in very short order. Being as you're in Florida Ed,you don't really need the engine coolant heating the tranny fluid. If the cars and HD trucks don't need to heat the tranny fluid,the 1500's don't either
You just need the molded hoses for a 5 or 6 speed truck,i ordered hoses for a 2012 truck for mine.Then it's just a matter of installing them from the engine to the heater core outlets on the firewall,then remove the hoses from the engine that feed the 3 way valve.You can leave the hoses that go down and feed the TMU,as they're a b!atch to remove with the tranny in place,you have to physically cut them into pieces to get out if the transmission is still in place.It doesn't hurt anything to leave them in place,as they're not doing anything after you disconnect them.
Depends,do you want to bypass the 3 way valve and tmu,or not. If you want to bypass everything, get the 6 speed hoses,if you want to keep everything intact,then get the 8 speed hoses.If you bypass the 3 way valve,disconnect the hoses to it,but leave it plugged in,and it won't throw any codes.It also won't develop any leaks ,and need replacing if there's no pressurized coolant fed to it
When I looked up the 6 speed hoses part number on RockAuto, it came up with a Dayco brand molded hose, but it was only one hose. It also had no clamps, but it was only $19, too. Who cares if I have to order 2 of them?Depends,do you want to bypass the 3 way valve and tmu,or not. If you want to bypass everything, get the 6 speed hoses,if you want to keep everything intact,then get the 8 speed hoses.If you bypass the 3 way valve,disconnect the hoses to it,but leave it plugged in,and it won't throw any codes.It also won't develop any leaks ,and need replacing if there's no pressurized coolant fed to it
When I use Dayco hoses they are definitely half the thickness of the OEM they are replacing. They also tend to “bulge” whereas the originals don’t. I only use them if I can’t get OEM because they are made in the USA
And THAT is what I was worried about. Thank you for the info. Made in USA is a plus, though.
Thank you, that is the 55056906AH, looks like thats the one I will get if and when I get my truck finished. Seem to be similar priced across the net.
If you're converting back to earlier style 5/6 speed hoses,the "T" will go away,and that hose should go to the top heater core outlet,and the lower outlet hose from the heater core will go to the black pipe
Thank you, Rick.
If the transmission is still in the truck,you basically have to cut the steel lines to get the hoses out that feed the TMU unit.I'd leave the ones that go over the transmission in place,and just remove as many of the rubber hoses off them and the 3 way valve as you can.The older molded hoses really tidy up the heater hose routing,but getting the hoses that go over the top of the transmission out means you're doing some cutting. Both KrazyKid and i had to cut the steel hoses to remove them.I still think i have my old lines laying around i can get you pics of them,showing where i cut them to remove them if you want Ed.
Thats ok, I will just remove the rubber I can easily do for now.
