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  1. Vortec 5300 5.3L V8
    Hi all, I have a 2012 1500 with the 5.3. About 3 or 4 months ago, I noticed when sitting idle, I could hear sloshing in my coolant system. I also noticed the heater only produced heat when the vehicle was moving (when there is higher flow through the cooling system). I regretfully kind of left...
  2. Vortec 5300 5.3L V8
    I have a 2005 Silverado 5.3 Vortec with now 192k on the engine. I am experiencing what I seem to be pretty good coolant loss. About 150-200 miles to empty my reservoir of coolant. Within the last year I’ve torn this truck apart trying to chase issues. I have replaced, thermostat, water pump...
  3. Vortec 4300 4.3L V6
    Can I drain the old coolant and put a different coolant, or will it damage something??
  4. Vortec 4800 4.8L V8
    Truck is a 2003 Silverado (stock 4.8L) I go through about a gallon of coolant roughly every month by gradually adding it to keep it at the filled mark throughout the month.I had the waterpump and hoses done early this year but the issue kept happening regardless. My heads are 706 casting. I've...
  5. EcoTec 5.3L V8
    Hello all. First time on here but don't know where else to go. I have a problem on my 2016 silverado 5.3 with only 65K miles in it that I can not figure out. I just had the wonderful AFM lifters replaced do to one failing. So had all the lifters replaced just to be safe. Not cheap by the...
  6. Vortec 5300 5.3L V8
    Recently replaced my coolant temp sensor and radiator hose adaptor because it broke off and leaked out all my coolant. Now my truck doesn’t blow hot air and says low coolant even though the coolant is filled up. Any help with a diagnosis? Head gasket? Air in the system?
  7. EcoTec 5.3L V8
    I have a 2014 Silverado 5.3 one day I was coming home from work and I noticed my cooling fans were on full blast even with the truck off so I pulled the fuses let the truck sit and after about 20 mins I started the truck again and it was fine. The next day I took our shops snapon scanner and...
  8. Vortec 6000 6.0L V8
    I decided it was time to change the coolant in my 2015 2500HD 6.0L and other than having to make a mess when removing the lower rad hose since my radiator has no petcock, the drain went smoothly. I only got a little over two gallons out, but then I didn’t remove the block drains so I wasn’t...
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