2020 corolla 2.0 Heater only working on passenger side

[taxidriver50005]

Drivers side heater only gets luke warm at best even with heater on high, anyone had this before. 

Still under warranty but somtimes it's easier to sort yourself. 

[forkingabout]

Not something silly like the dual zone climate control being switched off?

[taxidriver50005]

On 10/24/2024 at 5:38 PM, forkingabout said:

Not something silly like the dual zone climate control being switched off?

Nope, I've tried every setting possible, max on drivers side.. Cold on other.. Duel on or off.. Nothing gives drivers side any heat.

[TonyHSD]

When you select different settings of temperature or dual zone control can you hear actuators opening and closing flaps inside the dashboard? 
This will give you an idea if it’s a hardware issue something wrong with flaps control or other things. You can check for faults in the hvac system with app on your phone. 

[taxidriver50005]

No faults on car scanner or torque which leads me to believe it mechanical fault, blocks heater matrix ect

[Red_Corolla]

A lot of these dual zone cars have sensors in the vents to feed back the air temperature. A bad sensor can be troublesome - worth checking if you can find someone with a scanner that can see the individual temperature readings.

[AisinW]

Carista App with any fully compatible ELM2 OBD2 scanner can do that. Veepeak is only 12£ and works well. You can get 1 week trial version Carista app.  

[taxidriver50005]

15 minutes ago, AisinW said:

Carista App with any fully compatible ELM2 OBD2 scanner can do that. Veepeak is only 12£ and works well. You can get 1 week trial version Carista app.  

Toyota have already scanned it but no error codes, still no heat drivers side so got to be mechanical 

[AisinW]

Check the location of the sensor and clean it with 90% isopropanol spray. Dirty sensor will not trow any code either. If it is mechanical, you can check it by changing the vent modes and hear the flap moving. 

Opening the HVAC job is 10h jobs, expensive repair.

[taxidriver50005]

46 minutes ago, AisinW said:

Check the location of the sensor and clean it with 90% isopropanol spray. Dirty sensor will not trow any code either. If it is mechanical, you can check it by changing the vent modes and hear the flap moving. 

Opening the HVAC job is 10h jobs, expensive repair.

Yup still under warranty, but until they have error code Toyota don't like to authorise any repairs,  it's in next week for a boot kick sensor replacement so they can have another look too. 

[taxidriver50005]

Well kick sensor replaced and service guy agreed with me heater not working correctly.... It's booked in for a diagnostic but guy said we will probably just throw in a heater box..... Glad it's under warranty as that's a proper dash out job 😳😳😳😳

[TonyHSD]

How often you had been changing your cabin filter?
 This is ultra important for long and trouble free work on the hvac system, and last but not least for your lungs.   
Manufacturers recommended intervals are way too long. 

These new Toyota cars seems not as reliable as the older generations, or perhaps the dealers aren’t doing the right things.
In your case injectors issues, heater issues, what’s next ?
You are a taxi driver and the car daily use means work or no work.
If that’s was the case before a decade ago with Prius Toyota hybrids would have not be nowhere near where they are now, because people  are buying and driving Toyota cars first because reliability, drivability and then efficiency. Dealer had replaced the sensor and no help, did they not tested first to confirm it’s bad sensor? Warranty it’s ok but when expires these will be high cost repairs. 
 

[taxidriver50005]

Sensor was changed and I tested it myself at dealers... Worked fine then back home no joy, looks like a intermittent fault. Cabin filter changed on schedule.. I check filter myself afterwards. 

Heater issue isn't unheard of either, just so happens dealer was already knee deep into changing heater box on another car (rav 4). 

I'm not convinced all my issues aren't related somehow, if I was paying for it I wouldn't bother... Kick sensor.. Never had one before and only getting it fixed because I'm not paying for it... Heater would be nice to work properly but it still heats cabin up just not as hot my side. 

Injectors seam to be behaving... Apart from that it's great... Teething problems... Or maybe a Friday afternoon car? 

[TonyHSD]

Cabin filter best practice is to change every 10k miles or once a year. You do 30k + miles a year means cabin filter needs change 3 times. Toyota will do once. Dirty cabin filter can lead to many problems along the system. I think the car care nut had a video about similar issues and you can research and watch will be interesting to see the things from inside. Hopefully they will sort it for you soon. 
 

[AisinW]

Yes, cabin air filter is 1y interval, engine air filter is 4y.  People ofthen do the opposite. 

I have 2 cabin air filter (Denso and Bosch) that I wash with laundry detergent and exchange them every 6 months. They are made from fiber glass not paper. Cheap cabin filter (japanpart, fram,erc) are made from paper and cannot be washed.