mantis
Posts: 2
Joined: Wed Jul 10, 2019 5:07 pm

AC not reliable in warm weather

Wed Jul 10, 2019 5:20 pm

Hello all. I've got a FFE 2017 that I generally have no problems with.

However, whenever the car is 'out in the heat' for a while, the air conditioner becomes really unreliable. For example, entering the car after its been sitting out in 26degC+ (80degF+) weather is a guarantee for the AC to be fully functional for maybe 5 minutes, before starting to blow hotter and hotter air.

At this point, I might as well turn on the heater; the air from the vents is that hot.
Sometimes, fully rebooting the car or letting it sit for a little while causes the AC to be functional again, for around the same amount of time.

Has anyone else experienced this? Is this something to do with cooling of the batteries?

I thought about going to the dealership, but my confidence in them being able to diagnose properly is... slim. Also, whenever the weather is calmer, the AC works perfectly fine. Any cooler and it is freezing cold.

kalel14
Posts: 110
Joined: Sat Jan 09, 2016 4:05 am

Re: AC not reliable in warm weather

Wed Jul 10, 2019 11:52 pm

In hot weather, the cooling system prioritizes cooling the HV battery before cooling the cabin. So the air conditioning compressor is running, but it's not your turn to get cold yet. After the battery temp is at a manageable level, cold air is diverted to you. This is normal.

scottt
Site Moderator
Posts: 309
Joined: Mon Apr 06, 2015 6:00 am

Re: AC not reliable in warm weather

Thu Jul 11, 2019 3:54 am

Surprising though. It's been in the 90's here for a bit. I'll usually remote start, however even if I don't I get frigid air immediately out of my AC. Love the AC in the FFE. I could store meat in the car in the middle of summer with no issue.
2015 Magnetic FFE (aka Magneto) - Retired
2017 Kona Blue FFE (aka King Kona) - Current

mantis
Posts: 2
Joined: Wed Jul 10, 2019 5:07 pm

Re: AC not reliable in warm weather

Thu Jul 11, 2019 4:10 am

kalel14 wrote:
Wed Jul 10, 2019 11:52 pm
In hot weather, the cooling system prioritizes cooling the HV battery before cooling the cabin. So the air conditioning compressor is running, but it's not your turn to get cold yet. After the battery temp is at a manageable level, cold air is diverted to you. This is normal.
Thanks. Should I be leaving the cabin AC on, or will leaving it off have the same effect?

kalel14
Posts: 110
Joined: Sat Jan 09, 2016 4:05 am

Re: AC not reliable in warm weather

Thu Jul 11, 2019 4:34 am

The car won't cool the cabin until the battery is happy, so you'll get warm air if you leave it on. But there's no indicator the battery is happy, so you'll never know when it's ready for you to turn the air conditioning on.

kanechuck1962
Posts: 1
Joined: Mon Jul 29, 2019 1:59 pm

Re: AC not reliable in warm weather

Tue Aug 13, 2019 9:43 am

I just hit remote start and let it start cooling the batteries before I get to my car, but in the 100+ weather we have been having lately, its taken up to 22 minutes before I feel and cool air due to the heat here. Of course I just leave it plugged in to save my batteries energy while cooling. last five days has been 105 to 109 according to the cars temp gauge.

Fat Focus
Posts: 41
Joined: Mon Jun 04, 2018 2:58 pm

Re: AC not reliable in warm weather

Thu Aug 15, 2019 3:27 pm

My 2018 with 16k miles works very well. It was parked on asphalt in 100 degree temps today. When I left the office, it took less than 10 seconds to start blowing colder, and no more than 1 minute to have very cold air. It maintained that as I drove 30 miles, including some long stop lights- and 80 MPH on the freeway.

I had a failure of one of the lines earlier this year. Ford warrantied it and maybe the dealer did a better job setting the high/low pressures? I don't know.

CAUTION: If you have your AC serviced at the dealer, ENSURE they order a bottle of the (compressor?) lubricant AND RECEIVE IT before they start. It took my dealer 6 days to get a bottle. Once they let the oil out of yours, you're SOL until they get the correct lube. The problem is it's not a stocked Ford part number. The dealer actually places an order with another company for it. Just, caution...
2018 Focus Electric
2013 GT350 Supercharged Widebody Convertible
1999 F250 7.3 Crew Cab 6-Speed 4x4
1964 Falcon Convertible 289 4-Speed

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