raiderred77077

The one I pulled looked like the picture I sent you. However, over xmas I was looking to download the 07 ram service manual, but the closest I could find was the 06 service manual. So then I looked up the evap. temp sensor on the 06 and the location. It did not look like what I pulled, it was more like a disc w/ a needle protruding in the coils.

You would not happen to have the 07 service manual, or know where I can get my hands on one? Thanks for your help.

raiderred77077

I just noticed you are in longview, tx. Nice to get help from a fellow Texan.

raiderred77077

Well here is the picture of my evaporator temp sensor. I just verified it was it from the wiring diagram I have for the evap. temp sensor. It is suppose to have DB/LG and DB/DG (ground) wires going to it, which it does. Here is a picture of the one out of my pickup.



Now I also found the diagnostic for the evap sensor:

Diagnostic Test
1. CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT VOLTAGE WITH THE SENSOR
DISCONNECTED
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
With the scan tool in Data Display, read the Evaporator Temperature
Sensor voltage.
Is the voltage 4.9 volts or greater?
Yes >> Replace the Evaporator Temperature Sensor in accordance
with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No >> Go To 2

Well I got 5V from the harness when my ignition was turned on. Well it says that I need to replace my evap. temp sensor. However, that does not make sense to me since I have the evap. temp sensor off and I am just testing the wiring harness. If I am just testing the wiring harness how would it know that the sensor itself is bad? I am sure I am missing something here. Thanks guys.

SpeedyWS6

Good deal... They must have changed the design of the sensor because it was such a pain to get to.

The test is to rule out a problem with the wiring, but you need to know what the computer is seeing to test things properly. If you already swapped the sensor out and it didn't correct the problem it's probably not the problem.

It's probably time to get the hvac data scanned to see what codes are stored.

SpeedyWS6

Yeah if you were a little closer I could scan I for you...

Edit: I just looked at my truck and that is for sure the evap temp sensor. Must have changed it after 06.

raiderred77077

Well crap. I hate having to take my truck in for service, but I do not have a scan tool. So the scan tool that a service dept. uses is more in depth and will pull codes different that the regular odb II scanner that "Timmy" has at autozone?

Should I just take this in to a good AC repair place or the dealer? I think if they just pull the codes I can fix the problem.

SpeedyWS6

The sanner at autozone is a joke... A good ac shop may have a good scanner, but I kind of doubt it if all they do is ac work. Call a few and ask if they have a scanner to pull HVAC codes.

Cecil Kinard

I got a 07 dodge 3500 mega cab doing the same thing.