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Chevy Silverado and GMC Sierra Radiator and Cooling Questions

24

Comments

  • arkz71arkz71 Posts: 10
    I had gradual coolant loss over time, it was not from the water pump (replaced), intake manifolds because they are dry. I had paid $900 for an ext warranty when I bought my Z71 back in 2003 with a 5.3 reg cab. I have to say it has paid for itself, both of the heads were replaced due to a porosity crack in the head. After the rocker covers were off, there was plenty of dexcool that had gelled in the covers. The warranty paid for all of it for a total of around $2800 labor & heads, plus a electrical part.

    So if anyone has slow coolant loss be-aware of the symptoms and you can find out by pulling a rocker cover off. If you got coolant then you have to have new heads. I have 99,300 miles on the truck and the warranty runs out at 100,000 I will most likely purchase an extension since it has more than paid for itself.

    Good info to know.
  • I have a 2002 Chevrolet 2500HD crew cab. My low coolant light keeps coming on , I put coolant in each time but I have no idea why it is doing this. I just added coolant on Sept 1st and here it is 19 days later and the light is on again. What should I look into doing first? What can be causing this? My temp gauge is fine it never goes up when the light comes on. Any suggestions? Thanks!
  • Hope you've found the solution by now. I've got the same problem in the same model with 6.0 liter engine. Went and checked with a trusted mechanic this morning expecting to spend BUCKS. He said, "GM is aware of this problem. Go by the Chevrolet dealership, and pick up a package of 5 tablets. Put them into your cooling system and drive it. The tablets will seal the tiny cracks in your heads and gaskets." He claims it works! The dealership charged me $5.95 for the parts in a GM package, and seemed very aware of the problem. So if you haven't gotten a solution by now, don't be too scared....hope this works for both of us. My truck will see HEAVY usage from now until the end of february.
  • I don't know if this will help at all but I have two chev trucks that would not keep a consistent water temp. It would fluxuate up and down all the time I was driving it and when idling my heater went cold. I did much of the same repair with no result and then before a trip to Fla I replaced my serpentine belt and the temp has been steady since. The pulley that drives the water pump and fan is on the flat side of the belt and not the ribbed side so it seems that all these years the belt has been slipping over that pulley causing the water pump to run slower than it should. If you don't want to replace the belt you can also try a belt dressing that can be sprayed on for extra traction
  • I don't know if this will help at all but I have two chev trucks that would not keep a consistent water temp. It would fluctuate up and down all the time I was driving it and when idling my heater went cold. I did much of the same repair with no result and then before a trip to Fla I replaced my serpentine belt and the temp has been steady since. The pulley that drives the water pump and fan is on the flat side of the belt and not the ribbed side so it seems that all these years the belt has been slipping over that pulley causing the water pump to run slower than it should. If you don't want to replace the belt you can also try a belt dressing that can be sprayed on for extra traction
  • I have a 2004 silverado. 5.3 engine with about 87000 miles. I noticed a coolant leak on the right side of the engine that appears to be a head gasket. Has there been any recalls for this? How much should I expect this to cost?
  • Thanks for the tip!!! I was planning on taking my truck to the dealer in the morning. It does seems like a patch instead of a fix....but I guess if they are having trouble with crazing of the casting or porosity it should work. Too bad the warranty is expired!

    Thanks again
  • my radiator cracked and i found one at a junk yard but it has a small hose right below the cap that my truck doesn't have can i cap it off? it has all the other hoses and hardlines that my truck has
  • 57bob57bob Posts: 2
    The coolant temperature gauge over the last two months has slowly stopped working. The truck has a new radiator, hoses, thermostat and I replaced the coolant temperature sending unit that is in the front engine manifold near the thermostat housing. It is a v6 4.3. Is there something else that I should check or is it the gauge.
  • bowanabowana Posts: 9
    Hi,
    I don't know if the 4.3 is the same as the 5.7 but I have a 99 350 and I have just been chasing a problem with the guage fluctuating as well. I did change the sending unit on the water thermostat housing but have found out that particular sensor runs to the computer (2 wires). Look at the side of the engine heads between the plugs for another sending unit. It will be the unit with 1 wire and it will send the information to the guage. Hope this helps.
  • edw6edw6 Posts: 2
    Hi, I have recently purchased a 1993 Chev truck with a 6.2L diesel motor and I am fixing a few problems on it, the current fix I am addressing is a coolant leak between the timing gear cover and the engine block. I have removed the water pump and mounting plate and I see that the water pump pumps water through two passages in the timing gear cover into the block and it is at the joint between the back of the timing gear cover and the block where I have some leakage, I don't see a lot of leakage there but there will always be some coolant on the steering parts underneath. I will replace the water pump and install new gaskets and hope that retorquing will fix the problem because to remove the timing gear cover requires considerable work beyond what I would care to do.I am wondering if anyone else dealt with sort of a problem and how they resolved it. Would a stop leak product be a successfull resolve? Thanks for any feedback in this matter.
  • Hey folks, new here, with an issue. I've owned my 1998 Silverado since Thanksgiving, 2007. It has a Vortec 4.3L, 5-speed. For about a month I have been smelling antifreeze, but haven't seen any signs of a leak anywhere. Interior heat is good, temp gauge is good. Today while out and about I noticed when getting back in the truck, leaking from the back of the engine. It's dripping down from above the oil filter on the driver's side. I would think it's a freeze plug issue; possible? Is it something I can do in the backyard myself, how many freeze plugs are there, where are they, does the motor need to come out, can a freeze plug corrode and develop a small hole that could be fixed with Barr's leaks? Any comments would be appreciated! It's a 2-wheel drive. Thanks.
  • 3 hours after my last post, I started my truck, turned the heat on. It's still leaking somewhere, dripping down from above the oil filter. I noticed a little coolant on the intake manifold next to the valve cover on the driver's side. After idling for 15 min., still warm in the interior, but now it smells faintly of coolant. Water pump, rad, hoses, heater core all look dry, no milky foamy stuff in oil/dipstick. With rad cap removed, coolant wasn't visibly moving. Temp reading about 125-130. Ideas?
  • srtttusrtttu Posts: 1
    I have a 97 Sierra 1500 with 126,000 miles. I have a somewhat loud sound of water running through the passenger side of my dash. This is nothing new. It's done this for over 2 years. There has never been a problem until now...maybe? Now, the truck will randomly overheat until the sound of the water rushes through the dash and then the temp will drop to normal operating temp. Also, I would like to add that when the truck overheats and there is no water sound, the heater does not work. Then as if some type of magic, you'll hear the sound of water, the truck drops in temp and the heater works. The mechanic changed the thermostat and flushed the radiator and this clearly did nothing. The theory I have developed is that when I hear the water, things are normal and all is good, when there is no water, all is not good. Help.
  • srtttu
    I had a similar problem in my 2002 Altima. The sound of swishing water was quite loud. It turns out there was a very small leak in the radiator. The leak was so small the radiator fluid would evaporate before dripping onto the ground, so there was never a puddle underneath to tip me off to the problem. Apparently, when there is a leak, the cooling system wouldn't hold pressure and an air bubble would form in the system. The bubble wants to rise to the top of the system, which is the heater core inside the pasenger cabin. The bubble would create a condition like vapor lock that can occur in a fuel system. Anyway, long story short, once the radiator was replaced no more swishing sound and all is well.

    I'd have a pressure test run on the cooling system.

    1offroader
  • 57bob57bob Posts: 2
    Thanks for the information on the other sending unit on the engine head. I finally got it replaced and fixed the problem. I had a hard time finding it at the auto parts places and even the dealer parts department because they call it a temperature switch for some reason but it looks like a sending unit.
    Thanks again
  • whats involved with the replacement of thermostat on 2000 gmc z\71 5.3 litter: maybe someone can help me with this.on regular days with outside temps 70 are above,I get average mileage,as average as you can get with a 4x4,but on the way to the lease with temps in the 30's and below,I pass everything but the gas station,I use twice the fuel there and back,but gauge is in the normal range,if i make a stop for any amount of time the gauge drops below normal range,,way below.thats while it has been idling ,I have 275 thousand on her and have never changed the stat,could that be the problem.THANKS
  • my friend had the simular problem,is the smell more apparent inside or outside the vehical, his was outside,turned out it was the intake manifold,
  • hi again,
    been awhile since i last posted..silverado 1500
    5.3, 4wd just ovrheated..pulled over to check things out and added some water and it seems to be pouring out the backside of the engine..not dripping put a gallon in and its out in less then 30 seconds.....both sides,passenger and drivers side..tough to see but either its on the heads or just below on the block....havent done a freeze plug in 15 years..do they still have them on the back of the block ,,2 at once tho???
    even if its a head gasket..both at once??
    and my big question here is do blown head gaskets always leak into the oil to show that white filmy telltale sign...engine runs great..no skips or stalls..was only 2 miles from home so i filled it and drove away and the temp gauge went up then down and then blew warm heat then back to cold..
    i'm an old timer and just like tinkering with 70's and pre 70's engines,would there be any other coolant lines on the backside of the engine that might cause the leak?
    thanks for any help!!
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