- tor 07 jan 2021, 19:59
#1422346
Yes, it rises the suspicion towards the Evap.sensor, but it's also expected to get a rise in heater air temp when air isn't extra cooled/dried bye the Evap. core,
especially with low heater efficiency.
It's also normal that the heaters air temp gets somewhat lower with at near to max Fan speed,
especially with low heater efficiency and low outside temp.
Those symptoms should be less exaggerated when cabin temperature has stabilized after a longer drive,
because then the heater system would have some spare heating capacity to regulate "more heat" when the fan moves colder air faster through the H.core.
So we might be looking at a climate system with a defective Evap. temp sensor, a heater core with low efficiency, with some trapped air in the core....
Time will show
PS: Recirculation should always be Off anyway, except in shorter periods like in a tunnel when outside air quality gets very poor.
Cars with AQS-sensor has an "auto" position on the Recirc. button, but usually the sensor is dead and expensive, so Auto** and Off usually gives the same result...
Dark LED on Recirc button = off/normal , Orange LED=Recirculating, and eventually a green LED=auto recirc, depending on signal from AQS-sensor at cabin air intake)
** Auto "separated" from the global CCM-auto button
especially with low heater efficiency.
It's also normal that the heaters air temp gets somewhat lower with at near to max Fan speed,
especially with low heater efficiency and low outside temp.
Those symptoms should be less exaggerated when cabin temperature has stabilized after a longer drive,
because then the heater system would have some spare heating capacity to regulate "more heat" when the fan moves colder air faster through the H.core.
So we might be looking at a climate system with a defective Evap. temp sensor, a heater core with low efficiency, with some trapped air in the core....
Time will show
PS: Recirculation should always be Off anyway, except in shorter periods like in a tunnel when outside air quality gets very poor.
Cars with AQS-sensor has an "auto" position on the Recirc. button, but usually the sensor is dead and expensive, so Auto** and Off usually gives the same result...
Dark LED on Recirc button = off/normal , Orange LED=Recirculating, and eventually a green LED=auto recirc, depending on signal from AQS-sensor at cabin air intake)
** Auto "separated" from the global CCM-auto button