AC Temp Controls don't work
Thread Starter
Junior Member
Joined: Jan 2013
Posts: 54
Likes: 2
From: Florida Panhandle
2006 E350
AC Temp Controls don't work
My AC has been freezing up on long freeway trips, but that has been manageable as I usually drive locally.
Now my temp controls have no effect on the vent air, which is 33-35 degrees all the time that the compressor is on.
I was procrastinating on replacing the evaporator temp sensor - would that cause this problem as well as the icing up issue, or is their another problem as well?
TIA.
Now my temp controls have no effect on the vent air, which is 33-35 degrees all the time that the compressor is on.
I was procrastinating on replacing the evaporator temp sensor - would that cause this problem as well as the icing up issue, or is their another problem as well?
TIA.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Do you have climatronic that allow sensor readout? (one that has REST button)
That would allow the troubleshooting from comfort of driver seat.
The system has 7 temp sensors plus pressure sensor and any defective sensor will kick the program out of balance.
That said, the computer has default programs. My newly purchased car shows 99C for refrigerant temperature while the system works very well, what I take as program having clear indication of sensor failure just went to default.
But if sensor malfunctions with big error, that will fool the program.
That would allow the troubleshooting from comfort of driver seat.
The system has 7 temp sensors plus pressure sensor and any defective sensor will kick the program out of balance.
That said, the computer has default programs. My newly purchased car shows 99C for refrigerant temperature while the system works very well, what I take as program having clear indication of sensor failure just went to default.
But if sensor malfunctions with big error, that will fool the program.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
Thread Starter
Junior Member
Joined: Jan 2013
Posts: 54
Likes: 2
From: Florida Panhandle
2006 E350
Do you have climatronic that allow sensor readout? (one that has REST button)
That would allow the troubleshooting from comfort of driver seat.
The system has 7 temp sensors plus pressure sensor and any defective sensor will kick the program out of balance.
That said, the computer has default programs. My newly purchased car shows 99C for refrigerant temperature while the system works very well, what I take as program having clear indication of sensor failure just went to default.
But if sensor malfunctions with big error, that will fool the program.
That would allow the troubleshooting from comfort of driver seat.
The system has 7 temp sensors plus pressure sensor and any defective sensor will kick the program out of balance.
That said, the computer has default programs. My newly purchased car shows 99C for refrigerant temperature while the system works very well, what I take as program having clear indication of sensor failure just went to default.
But if sensor malfunctions with big error, that will fool the program.
Thanks.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Cost me about $50 on ebay and 20 minutes of work.
Now I can test my system at 80 mph.
On mine I need to hold REST only, no need to push OFF
Last edited by kajtek1; Jul 12, 2016 at 07:53 PM.
Thread Starter
Junior Member
Joined: Jan 2013
Posts: 54
Likes: 2
From: Florida Panhandle
2006 E350
I replaced the evaporator temp sensor (very easy) and now the vent temps are just under 40 degrees, so it looks like the freezing problem has been resolved.
I find I have to set the left temp to 76 degrees to get the left vent temperature to rise above 40.
1. Is there a sensor controlling the vent temperature?
2. Kajtek1 mentioned installing a different HVAC panel that can read out diagnostics. I cannot get my manual to work, can you direct me to a DIY resource?
Thanks.
I find I have to set the left temp to 76 degrees to get the left vent temperature to rise above 40.
1. Is there a sensor controlling the vent temperature?
2. Kajtek1 mentioned installing a different HVAC panel that can read out diagnostics. I cannot get my manual to work, can you direct me to a DIY resource?
Thanks.
