Outside temperature display blank?
Thread Starter
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Senior User
Joined: Oct 2008
Posts: 179
Likes: 3
From: Goose Creek, SC
Outside temperature display blank?
Took the truck to the store for some stuff and everything was normal. A/C was on auto and set for 73 and outside temp was about 45. Got my stuff and headed to work and I noticed that the display was blank and the A/C wouldn't work. When I got to work I turned the truck off and then cycled the ignition back to the ACC position and the display remained blank. After work I got in the truck and when I started it up everything was back to normal. I had both batteries tested and the charging system load tested. Both batteries had over 800 CCAs and the alt was good (13.3v at idle). I'm pretty sure that the batts are the originals since they're both motorcrafts. The truck takes about 2-3 seconds to start pretty much regardless of the temp so far (32-85). Normally once a week I hook my charger up to the batts overnight and charge overnight at 6 amps. It's fully automatic and shuts off when the batteries reach ~14v (not sure exact number). The passenger side batt has the red ball showing and the driver has the green one. If anyone has any ideas they're much appreciated. I think I picked up a gremlin and hopefully he jumped on the dodge I parked beside today.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Perhaps the alt isn't functioning as well at high speed? When the motor is turning 2k rpms and the alt should be putting out 100amps, perhaps you have a couple dead diodes or they over heat and your only putting out 40-50 amps. The lower output means your electronics are getting too little voltage and shutting down.
Postmaster
Joined: Jan 2005
Posts: 4,743
Likes: 3
From: Peoria, IL
You didn't say what kind of truck you are talking about but your profile says you have a 2005 F250. They way you are talking it sounds like you have a Lariat with the Electronic Automatic Temperature Control (EATC) system. If so this is a somewhat common problem. I guess the relays inside the units have the tendency to get stuck and it causes the unit not to function properly. A lot of the time if you turn your headlights on and off, or shut the truck off and restart it will start to work again. However once it starts to happen it will begin happening more and more often. If you are still under warranty be sure to get it in to your dealer and get it fixed. If you aren't you may want to hold off on replacing it until it starts to act up a lot, as they are pretty expensive ($300+ if I remember right).
If you don't have the EATC system ignore everything I just said
If you don't have the EATC system ignore everything I just said
Thread Starter
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Senior User
Joined: Oct 2008
Posts: 179
Likes: 3
From: Goose Creek, SC
You didn't say what kind of truck you are talking about but your profile says you have a 2005 F250. They way you are talking it sounds like you have a Lariat with the Electronic Automatic Temperature Control (EATC) system. If so this is a somewhat common problem. I guess the relays inside the units have the tendency to get stuck and it causes the unit not to function properly. A lot of the time if you turn your headlights on and off, or shut the truck off and restart it will start to work again. However once it starts to happen it will begin happening more and more often. If you are still under warranty be sure to get it in to your dealer and get it fixed. If you aren't you may want to hold off on replacing it until it starts to act up a lot, as they are pretty expensive ($300+ if I remember right).
If you don't have the EATC system ignore everything I just said
If you don't have the EATC system ignore everything I just said
