Jump to content

Weird A/c Problem, Help!

czycoot1318

Recommended Posts

czycoot1318 Enthusiast

czycoot1318

Posted
Posted

So today I was working on my 98 silverado z71 and I took the battery cable off as I was trying to find the source of a radio static issue. The truck was off when I did this and later I put it all back together. I then left the house and noticed the a/c wasn't working. It was only blowing hot air, and only from the floor vents. If I shut off the switch, I have a manual climate control, the a/c and recirc buttons are lit up. The second I turn on the blower they shut off. I have never had a problem with the a/c in this truck and it worked last night and earlier today. I have tried resetting the system by disconnecting the battery, turning it on for 1 minute, starting and idling for 5 minutes then driving and nothing seems to be working. I also replaced the a/c pressure switch that's located on the condenser on the passenger side firewall and nothing changed. The only thing I did today was unhook the battery and now the a/c doesn't work. Any ideas???

txab Senior Enthusiast

txab

Posted
Posted

Try this procedure next.

 

Remove the HV ACIECAS fuse for a minimum of 10 seconds.

Re-install the HVACIECAS fuse.

Start the vehicle.

Wait 40 seconds for the HVAC control module to re-calibrate.

Verify that no DICs have set as current DICs.

czycoot1318 Enthusiast

czycoot1318

Posted
  • Author
Posted

The compressor will turn on and off but only when the blower is set to the off position. If the A/c and recirc buttons are pushed in and lit up then the compressor will cycle. I have tried almost everything, and nothing seems to be working. If I turn on the blower after the truck is running, there will be about a 2 second burst of cold air from the vents, then it switches to the floor and immediate heat. I have searched all over and don't seem to be getting any answers.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      2 speed transfer case optional now?

      By Chuck FB · Posted

      Yes, and also pulling heavy trailers or a large camper up steep grades as well as descending grades such as the more rustic off road camping locations and using engine braking with that low gearing as well as soft ground can just suck the power . I realize pickups these days tend to have an over all lower first gear ratio compared to automatic transmission pickups from years back so that has helped a lot in its ability in high range but there comes a point if in four wheel drive the torque runs out at the wheels, certainly with a gas engine. They don't put two speed transfer cases on pickups for a cool factor, they have a function if one needs that massive torque to the wheels that high range can't deliver. 
    • Grumpy Bear
      Grumpy Bears 2015 Silverado 2WD

      By Grumpy Bear · Posted

      Notes 7/18/2026   3,400 miles on this batch of Mobil 1 Euro 5W40 since the GDI pump replacement. Alcohol runs very clean when ring seal is tight and the sump isn't getting hosed with fuel. Checked oil level at fill up today as is my practice and grabbed a white Kleenex to look at the color. What color?  I was going to change it but.....  
    • Another JR
      2 speed transfer case optional now?

      By Another JR · Posted

      4 low is really nice on steep boat ramps. 
    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      Interesting, I suspect I would have fueled up in Lee Vining as the day prior I would have filled up either in Laughlin or near there and maybe again before I entered Death Valley and once out the other side late that evening as I kept on driving into the night up near Lee Vining. Next morning I most likely fueled up in LV before heading over Tioga Pass into ( as I refer to it as "Yose .... Mite" 😁 ). And again that was 19 years ago but the price then must not have jumped out at me like the 5 bill a gallon theme of nutty cult hippy country Big Sir or head so far up their rear Aspen. I'd be curious to know where the highest prices are in the lower 48, I probably would not be far off to guess somewhere in Cali forn ie. Coldfoot and Prudhoe bay may have those prices beat but that is a whole other world up there and when prices are more normal elsewhere that is about what they can be up there I believe in no mans land. Anyway interesting that the 395 corridor is hosing people and the thing is, its tourist season and its not like there are a lot of competition options when driving up that highway from what I could see. Yup, big ole Boaterhomes and various other RV's ahead and behind me at the Yosemite entrance gate and they have to get their fuel somewhere.  
    • Atlas
      Gas Prices

      By Atlas · Posted

      Those can be high, as well as the big California cities. The ones that will pop your eyes out are the 395 corridor on the Eastern side of the Sierra Nevadas. Lee Vining, $7.19 for regular and $8.89 for diesel is what the Google said right now.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...