HVAC and Battery Fix?????
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Member
Joined: Sep 2005
Posts: 46
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From: Tampa, FL
HVAC and Battery Fix?????
I need a little explaining done for me. 
I’m not new to auto’s and have worked on them my entire life from tranny’s to motor rebuilds, but I recently ran into a fix that seems strange. My truck is a 2004, Lariat 4x4, and 90K on the odometer and averaged around 330 miles per tank (13.2 mpg) mostly highway.
I have been having problems with my trucks A/C for the past 6 months blowing hot air intermittently, never cold enough, AC clutch cycling and most recently no cold air except when the floor/vent button along with recirc was active. Freon charge good with no leaks found and I have the EATC.
Over the last month or so, I noticed that it would take a little longer for the truck to start and the turnover of the motor was sluggish and when it did start the throttle response was lagging (not previously, I have an EDGE).
Since the starting was sluggish and the battery is nearly 5 years old I thought it was a good time to replace the battery. I purchased and installed a new battery and as soon as I started the truck everything began working correctly.
It’s only been 3 days but the air is so cold that it automatically goes down to the lowest speed in just a few minutes (Florida and 95 degrees) and the throttle response has greatly improved as well as my gas mileage (currently 15.2). So…can someone tell me how the system works? I have disconnected the battery several times in the past with no change in symptoms and the only difference now was the battery was replaced. Obviously the battery was the issue but I thought once the truck started the charging system took over (I checked it too and it checked out good).
I’m not new to auto’s and have worked on them my entire life from tranny’s to motor rebuilds, but I recently ran into a fix that seems strange. My truck is a 2004, Lariat 4x4, and 90K on the odometer and averaged around 330 miles per tank (13.2 mpg) mostly highway.I have been having problems with my trucks A/C for the past 6 months blowing hot air intermittently, never cold enough, AC clutch cycling and most recently no cold air except when the floor/vent button along with recirc was active. Freon charge good with no leaks found and I have the EATC.
Over the last month or so, I noticed that it would take a little longer for the truck to start and the turnover of the motor was sluggish and when it did start the throttle response was lagging (not previously, I have an EDGE).
Since the starting was sluggish and the battery is nearly 5 years old I thought it was a good time to replace the battery. I purchased and installed a new battery and as soon as I started the truck everything began working correctly.
It’s only been 3 days but the air is so cold that it automatically goes down to the lowest speed in just a few minutes (Florida and 95 degrees) and the throttle response has greatly improved as well as my gas mileage (currently 15.2). So…can someone tell me how the system works? I have disconnected the battery several times in the past with no change in symptoms and the only difference now was the battery was replaced. Obviously the battery was the issue but I thought once the truck started the charging system took over (I checked it too and it checked out good).
Junior Member
Joined: May 2006
Posts: 5
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I had the exact same thing happen to my 2004 I even posted the problem in here and got no help. After a month or more of ac problems I notice the truck cranking slow so I left the lights on for 10 minutes to see if the truck would start and she was dead. I replaced the battery and the ac was fixed. It doesn't make sense to me either. I didn't notice any gas or performance increase but it definately fixed the ac