Problem with A/C controls
#1
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Hi,
So my AC is working as in the heat and the cold both work, however, there is a problem where i can not set any of the vent modes.
ie, face, foot, windscreen defrost etc do not work. those controls do not respond to anything at all.
i can change temp etc but none of the vents.
after driving for a while i then i may see one of the vent modes flick on and off and on and off and then it will work, then after driving again for a while it may stop working again.
my first thought was to do a climate control diagnostic.
however when holding the recirc and auto buttons whilst turning the car on, nothing happens.
to me this points toward a dead/dying AC control module.
So my AC is working as in the heat and the cold both work, however, there is a problem where i can not set any of the vent modes.
ie, face, foot, windscreen defrost etc do not work. those controls do not respond to anything at all.
i can change temp etc but none of the vents.
after driving for a while i then i may see one of the vent modes flick on and off and on and off and then it will work, then after driving again for a while it may stop working again.
my first thought was to do a climate control diagnostic.
however when holding the recirc and auto buttons whilst turning the car on, nothing happens.
to me this points toward a dead/dying AC control module.
#2
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Quickly a common issue is the center vent thumbwheel , a potentiometer
This mixes the hot and cold streams bypassing the heater core / matrix
The center vent pulls straight out but be careful of the fragile louvers as they age / brittle
You can drive the door / trim motors with a 9 volt battery back and forth
Pic If I can find it
This mixes the hot and cold streams bypassing the heater core / matrix
The center vent pulls straight out but be careful of the fragile louvers as they age / brittle
You can drive the door / trim motors with a 9 volt battery back and forth
Pic If I can find it
Last edited by Parker 7; 12-28-2023 at 12:31 AM.
#3
#4
![Default](/forum/images/icons/icon1.gif)
Quickly a common issue is the center vent thumbwheel , a potentiometer
This mixes the hot and cold streams bypassing the heater core / matrix
The center vent pulls straight out but be careful of the fragile louvers as they age / brittle
You can drive the door / trim motors with a 9 volt battery back and forth
Pic If I can find it
This mixes the hot and cold streams bypassing the heater core / matrix
The center vent pulls straight out but be careful of the fragile louvers as they age / brittle
You can drive the door / trim motors with a 9 volt battery back and forth
Pic If I can find it
hot works, cold works.
are you suggesting that the centre vent thumbwheel is somehow sending a signal that makes the control panel inoperable?
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Parker 7 (12-28-2023)
#5
#6
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Alot of humidity lately
The foam air seals between the climate control ducts deteriorates allowing drips of condensation that may have wetted the climate control ECU connectors
With a heat gun you may be able to target the connectors as the CC ECU is mounted on the center plenum on the car's / plenum right side under one of the duct's joints
It was very humid up north at Port Douglas years back when there
The foam air seals between the climate control ducts deteriorates allowing drips of condensation that may have wetted the climate control ECU connectors
With a heat gun you may be able to target the connectors as the CC ECU is mounted on the center plenum on the car's / plenum right side under one of the duct's joints
It was very humid up north at Port Douglas years back when there
Last edited by Parker 7; 12-28-2023 at 07:14 PM.
#7
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nope.
as said, after driving a bit it may randomly start working in correct operation.
as you can see in my video, the only controls inoperable are the ones to control which vents are open and closed.
all other controls work and the ac unit works. blowing through the face and feet vents.
as said, after driving a bit it may randomly start working in correct operation.
as you can see in my video, the only controls inoperable are the ones to control which vents are open and closed.
all other controls work and the ac unit works. blowing through the face and feet vents.
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#8
![Default](/forum/images/icons/icon1.gif)
Alot of humidity lately
The foam air seals between the climate control ducts deteriorates allowing drips of condensation that may have wetted the climate control ECU connectors
With a heat gun you may be able to target the connectors as the CC ECU is mounted on the center plenum on the car's / plenum right side under one of the duct's joints
It was very humid up north at Port Douglas years back when there
The foam air seals between the climate control ducts deteriorates allowing drips of condensation that may have wetted the climate control ECU connectors
With a heat gun you may be able to target the connectors as the CC ECU is mounted on the center plenum on the car's / plenum right side under one of the duct's joints
It was very humid up north at Port Douglas years back when there
i will be installing speakers and amp amongst other things over the next week so will have a lot of trim out of the way so can easily inspect.
#9
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Looking at the wiring guide there are a couple of CC ECU ground wires to check for it proper operation
The 2 each wires that drive each door motor open and close do not include a ground but in reversing the polarity so I would look else where
The door position sensors may not be stable from a ground or a common point that they are spliced which are a few plus connectors
The 2 each wires that drive each door motor open and close do not include a ground but in reversing the polarity so I would look else where
The door position sensors may not be stable from a ground or a common point that they are spliced which are a few plus connectors
#10
![Default](/forum/images/icons/icon1.gif)
Looking at the wiring guide there are a couple of CC ECU ground wires to check for it proper operation
The 2 each wires that drive each door motor open and close do not include a ground but in reversing the polarity so I would look else where
The door position sensors may not be stable from a ground or a common point that they are spliced which are a few plus connectors
The 2 each wires that drive each door motor open and close do not include a ground but in reversing the polarity so I would look else where
The door position sensors may not be stable from a ground or a common point that they are spliced which are a few plus connectors
the part that really confuses me and really makes me think the module is dying is the fact that i can not enter the self test diagnostic mode.
#11
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ok so.
update.
i got it into diagnostic mode.
i realised that i was holding done recirc and auto and so it wasn't going in.
but then i started tapping them as was turning the ign on and and it worked.
so it was showing err code 24 and 44 but it was not beeping on those codes indicating that they were old errors.
i went through the actuator test and all seemed to be good.
i then cleared the error codes.
after turning the car off and on again i went back to diagnostic mode, all the lights flash to indicate all is good, and no error codes were showing.
after then resetting the car again i was trying to change the vents modes and no buttons were responding,
then after a little while, the one on the far right begins to flick on and off.
then the buttons began working, then they stopped and then that one began flicking again.
ithen the buttons all worked again.
i have a feeling i may have a sticky gunked up button that is causing havok.
sometimes acting as if it is pushed in and therefore disabling the other vent buttons
update.
i got it into diagnostic mode.
i realised that i was holding done recirc and auto and so it wasn't going in.
but then i started tapping them as was turning the ign on and and it worked.
so it was showing err code 24 and 44 but it was not beeping on those codes indicating that they were old errors.
i went through the actuator test and all seemed to be good.
i then cleared the error codes.
after turning the car off and on again i went back to diagnostic mode, all the lights flash to indicate all is good, and no error codes were showing.
after then resetting the car again i was trying to change the vents modes and no buttons were responding,
then after a little while, the one on the far right begins to flick on and off.
then the buttons began working, then they stopped and then that one began flicking again.
ithen the buttons all worked again.
i have a feeling i may have a sticky gunked up button that is causing havok.
sometimes acting as if it is pushed in and therefore disabling the other vent buttons
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