Colder A/C

[spydude1]

Hey folks. I am new here so please forgive me if I have missed this topic before. I have looked around, but haven't found what I am looking for.

I have a 2014 F-150 that blows cool air, but nothing like my old 2003 did. Since everything is electronic now I was wondering if I could adjust the temp of the air output of the A/C. Does anyone have an experience with this? The summer heat and humidity of South Carolina gives this truck a hard time to cool the cab.

Thanks in advance!

[Automate]

You may want to use FORScan to check your evaporator air temperature. Don't know about the F150 but the evap temperature sensors are known to go bad in Fusions. The evap sensor is used to prevent the coil from freezing over. When the evap temp gets too cold it shuts off the compressor to prevent the coil from getting too cold. So look for an evaporator temperature value that is lower than it actually should be measuring. In my car the compressor shuts off when the temperature gets around 40 deg F.

[richworth79]

I have a 2010 Ford Fusion Hybrid will forscan allow you to modify the reading of the temperature the reading on the evap?

[Automate]

I also have a 2010 Fusion hybrid. The latest version of FORScan will allow you to monitor the evap temp but not adjust it. My evap sensor seems to be about 20 degrees F low so when the evap air temp is around 60 the sensor is reading 40. This causes the system to reduce the speed on the variable speed AC compressor and therefore reduce the amount of cooling.

Here is a video about what happens when the sensor goes completely bad (open circuit) and how to replace it. https://www.youtube.com/watch?v=3cfPShi_-Nk
As you can see, it's a huge job because you have to remove the whole dash.

There is also a hack you can do to bypass the sensor but you risk freezing your evaporator. https://www.youtube.com/watch?v=imnNjh6wGo4

[richworth79]

What part of the app do I find the monitoring feature? For the a/c? I found this http://www.instructables.com/id/Quick-f ... ap-sensor/ I just want to make sure it is evap because I do the hack.

[Automate]

The Evap temp is in the HVAC module which is on MSCAN. You will need a OBDLink MX or one of the adapters with a manual HSCAN/MSCAN switch.

You can view the temperature value like any other PID. PID name is EVAP_TEMP.

Screenshot_20170625-083350.png (204.31 KiB) Viewed 10773 times

By the way. The above screenshot was taken after the car sat all night without any use including the AC. The evap temp should have been between 70 and 75 like the other temperatures.

Post what you find out about your car.

[richworth79]

My Evap temp was reading 20 degrees hotter then it is outside could this still be an evap sensor issue or could it be something else?

[Automate]

My Evap temp was reading 20 degrees hotter then it is outside could this still be an evap sensor issue or could it be something else?

Was your car sitting with the windows closed in the hot sun? In this case the inside of the car can get 20 degrees hotter than outside.

Does your A/C work well when it is first turned on but then you get decreased cooling after if runs for a while? This could be from your evaporator freezing over. If you evap temp sensor is 20 degrees hotter, your compressor would not slow down when the evap gets close to freezing. Also, do you live in a humid area? Evaporator freezing is not a problem in places like Arizona with low humidity.

Check your ACCM_ECS speed in the ACCM module (rpm/minute) it should give you an indication of how hard your compressor is working and the amount of cooling it should be producing.