What is the control mode for coolant 3-way HVAC valve?

[04fxdwgi]

 

[SWED]

Okay, you are definetely right in the way that troubleprone item is not a brilliant idea.
I will revise the concept once again on the weekend...

Thank you for your time!

PS. An illustration of the initial design:

 

[Wild one]

Okay, you are definetely right in the way that troubleprone item is not a brilliant idea.
I will revise the concept once again on the weekend...

Thank you for your time!

PS. An illustration of the initial design:

View attachment 584289

Years ago alot of vehicles used to use a manual valve in the heater core feed line that used a cable connected to the dash heater controls to manually shut off the flow to the heater during the summer months.That'd be your simplest,least trouble prone set up. I've actually done that trick years ago on a couple of my old vehicles,i just used a Choke Cable to control the underhood valve,and it worked good,and was simplicity onto itself to build and use,and never gave any trouble.Pull the cable to shut off flow,push the cable to restore flow to the heater core.Infinitely adjustable and totally reliable.

Amazon.ca : cable operated heater core shut off valves

QAZAKY Universal Carburetor Push Pull Choke Control Cable for 60-122 60122 290-835 290835 Lawn Tractor Mower 96" Conduit Go Kart Carts Mini Bike Oregon Lincoln F162 F163 SA200 SA250, Cables - Amazon Canada

QAZAKY Universal Carburetor Push Pull Choke Control Cable for 60-122 60122 290-835 290835 Lawn Tractor Mower 96" Conduit Go Kart Carts Mini Bike Oregon Lincoln F162 F163 SA200 SA250 in Cables.

www.amazon.ca

 

[SWED]

BTW what is the main malfunction reason in the stock RAM 3-way valve? Poor sealings / poor wiring / material degrading / whatsoever?

 

[Wild one]

BTW what is the main malfunction reason in the stock RAM 3-way valve? Poor sealings / poor wiring / material degrading / whatsoever?

Couldn't tell you, i've replaced a few,because they were throwing codes,but never did take any of them apart to see what was wrong with them,always gave them back to the vehicle owners to do whatever they wanted with them.But they're plastic,and a plastic based valve never seems to last. Ram only used them for a couple years though,before doing away with them,so i'm guessing they were replacing them under warrenty,and decided to simplify the system,and take the trouble prone 3 way valve out of the system,reducing their warrenty costs

 

[crash68]

BTW what is the main malfunction reason in the stock RAM 3-way valve?

There have been quite a few I've read about that either water or coolant was found in the electronics compartment. The valves are not as trouble prone as some on this forum make them out to be.

As for your quest of using this three-way valve to modulate heat, the biggest factor is usually sizing in relation of flow of the valve itself. Linear movement of the valve doesn't equate to linear output from the coil. Modulation of a 3-way even poorly sized still works better in most cases than on/off but with your application of turning the heater core off it's not a huge advantage.

 

[Wild one]

There have been quite a few I've read about that either water or coolant was found in the electronics compartment. The valves are not as trouble prone as some on this forum make them out to be.

As for your quest of using this three-way valve to modulate heat, the biggest factor is usually sizing in relation of flow of the valve itself. Linear movement of the valve doesn't equate to linear output from the coil. Modulation of a 3-way even poorly sized still works better in most cases than on/off but with your application of turning the heater core off it's not a huge advantage.

A simple ball valve can be completely modulated,and would do exactly what he wants it to do if it was set up with a cable or linear actuator,and would be simplicity onto itself to incorporate into a heater line.
If you go onto facebook,the 3 way valves give alot of trouble Crash

 

[Bob Horowski]

Oh dear swed, YOU are not the electromechanical engineer with all the hardware, tooling, and skills you THINK you are because if you were,you would not be on this forum asking other people how to do what you are dead set on doing but don't actually know how to do it. On top of that arguing with veteran contributors how your sheepskin trumps KISS.

 

[Tominator223]

Seems like an electric valve with a relay. That when you turn setting to low will activate relay & shut heater off . Would be a lot simpler . Than using a part that is prone to fail. A double valve could probably be found. And the heater core doesn’t care about the flow rate , if hot coolant is moving through it it’s going to heat. Sounds like you’re trying to fix a blend door issue by opening a window.

 

[04fxdwgi]

I bet just the right parts can be found cheap on Temu

 

[Bob Horowski]

Temu or Fleabay.

 

[Oxygen454]

Okay, you are definetely right in the way that troubleprone item is not a brilliant idea.
I will revise the concept once again on the weekend...

Thank you for your time!

PS. An illustration of the initial design:

View attachment 584289

Not sure if design is amined at the same system as my 2013 Ram 3.6L but the 3 way coolant valve is used to cool the transmission. The computer commands the valve to open or close depending on the temperature of the transmission. With a scanner, you can see the desired degree of open on the valve and actual degree of open.

Currently I am having issues with the valve working only sometimes. Today I drove a hour into work and the valve stayed open at 23 degrees and the desired was 82 degrees open. When I shut my truck off and restarted it, the scanner showed the valve immediately open to 83 to meet the desired 83 degrees open...

The transmission ran between 91 to 93 degrees Celsius. It did get to 100 degrees but for a very short time. The temperature was a hot 31 degrees outside.

The other half most likely goes to the heater core as you show but your missing the transmission part of the diagram.

 

[04fxdwgi]

It's also used to heat a cold transmission, if needed.

The "cooler / heater" is so easily replaced / bypassed with an aircooled cooler up front and a thermostatic mechanical valve. That would eliminate the possibility of a cooler going bad and leaking coolant into the trans, or trans fluid into the coolant.

 

[EdGs]

It's also used to heat a cold transmission, if needed.

The "cooler / heater" is so easily replaced / bypassed with an aircooled cooler up front and a thermostatic mechanical valve. That would eliminate the possibility of a cooler going bad and leaking coolant into the trans, or trans fluid into the coolant.

I'm glad I removed the coolant lines from my 3-way valve/TMU. No danger of intermingling fluids.

My valve is just there, still hooked up. When it dies, I will have to figure out what to do from here.