P26A3 - 3-Way Coolant Diverter Valve

[Trout]

Hi everybody! Long time listener, first time caller.

I have a 2020 Ecodiesel.

I'm getting the code P26A3. When searching for this code, I get a lot of the P26AB code that previous generations were getting for the coolant 3-way diverter valve. I'm having similar issues with the heater blowing cold until I stop and restart the truck.

When I look at the coolant diagrams for a 2020, the only 3-way diverter valve I see now is going to the rear axle (Part# 68309834ac). Previous gens it seems it was going to the transmission. Is this the part I should replace, or am I missing the correct one? Is this part under the airbox like previous gens? I haven't seen anyone references to this issue in forums to a 2019+ truck, so I want to be sure. I also haven't had a chance to get out and look at the truck due to the snow on the ground.

#9 below:

Thanks!

 

[2021EcoDiesel]

I believe the valve is located underneath the coolant reservoir up against the firewall on the Passenger Side on the 5th gen trucks, but that is only based on a quick look at AllData's information on my 2021. Please take that with a grain of salt.