Defogger causing engine to activate
Instructor
Joined: Jun 2023
Posts: 960
Likes: 513
From: NJ
Defogging requires a reduction in HUMIDITY. That is best done in vehicles by running the air conditioning system. And often, that triggers the ICE engine to run.
Most cars in the past 20 years run the A/C with windshield defogging. With the RX' 'Climate Concierge' it's gonna happen without you necessarily being aware.
++++++++++++
If this is different with the PHEV 450h+, someone can chime in and teach me something!
Most cars in the past 20 years run the A/C with windshield defogging. With the RX' 'Climate Concierge' it's gonna happen without you necessarily being aware.
++++++++++++
If this is different with the PHEV 450h+, someone can chime in and teach me something!
Thread Starter
2nd gear
Joined: Jun 2024
Posts: 2
Likes: 0
Defogging requires a reduction in HUMIDITY. That is best done in vehicles by running the air conditioning system. And often, that triggers the ICE engine to run.
Most cars in the past 20 years run the A/C with windshield defogging. With the RX' 'Climate Concierge' it's gonna happen without you necessarily being aware.
++++++++++++
If this is different with the PHEV 450h+, someone can chime in and teach me something!
Most cars in the past 20 years run the A/C with windshield defogging. With the RX' 'Climate Concierge' it's gonna happen without you necessarily being aware.
++++++++++++
If this is different with the PHEV 450h+, someone can chime in and teach me something!
thanks for the reply. We have been running the aircon without the ICE activating so far, its only then we started using the defogger that it started to occur. We have had plenty of lithium battery remaining as well (I thought it could be that)
Racer
Joined: Oct 2023
Posts: 1,299
Likes: 1,084
From: CA
You can manually select the defogger duct position if you don't want the engine to start. It's not as effective as with the engine running, but it does work. Pushing the front defogger switch is asking the system to clear the windshield as quickly as possible, which requires heat from the engine.
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