Q: Force electric air heater (after exhaust pipe heat exchanger bypass)

Your thermostat is probably stuck open, allowing hot engine coolant into the radiator before it gets up to temperture or you somehow looped-out your interior heat exchanger on the by-pass.

Hope this helps.....

 

what's the electric air heater, heat pump? shouldn't have anything to do with your bypass, and should come on without being forced.

 

Did you approach dealership? Out of the time/miles limit for the TSB? Or unending "back order" issue with the part?

There really should be a class-action lawsuit for this horse manure. Ditto for 3rd gen EGR.

 

I'm having the same issue, I did a heater exchange bypass, I live in quebec and weather is the -15C, drove the car for 20 minutes, and still the air blown in the car is cool, no hot air, any ideas that can help

 

When you say "A/C is always on, auto fan speed mode"

Are you saying you have the A/C button with the light on and not off?

That would keep the air cool.

Auto fan speed mode is fine but dont have the A/C button on, just turn the temp up to where you want it and keep auto fan mode on or do it manually.

Also not sure if this is a feature for your model but if you take the car out of ECO mode, there might be an electric heater that will help with heat, I know GEN 3 has that feature.

 

Well, If you did the bypass properly - your thermostat is probably stuck open. You need to plug in a scanner and monitor ECT.
If your within the Toyota TSB criteria you should let the dealership fix it. How many miles on the car and was the coolant changed per OEM specifications?

 

Autostart and warm up the car in the parking lot for 15 minutes.
The engine coolant temperature reaches +40+50C degrees
Get in the car, switch the flaps to the windshield heating.
Hot air quickly begins to flow into the cabin.

 

Maybe something in this post and the ones following will spark some ideas. (The diagram in that post shows the JDM / Euro hose routing including a selector valve, which some other markets like US don't have. Swap the details accordingly....)

It might be that drawing a careful diagram showing the exact placement of the bypass will shed light on the cabin heat situation.

 

Thanks, i will try it today