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Showing results for tags 'coolant leak'.
Found 8 results
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I have an interesting overheating problem with my 1990 C3500 Silverado 7.4L. I recently bought the truck from an uncle who, I'm guessing, screwed me on the deal... We use the truck to tow our travel trailer (22ft. roughly 5000lb). Prior to our first voyage out, we drove the truck around town to make sure everything worked well. After a few trips to our main hike spot I noticed the truck would run warm, 220-240, for a short time and then spike down to 210. I assumed it was the thermostat sticking. So I replaced the thermostat with a 180 degree unit. I topped off the coolant in the reservoir and it seemed to have fixed the problem. We went on our first trip, now pulling the trailer, and at our halfway point, I got off the freeway to fill up the truck. about 20 seconds after we dropped our speed below 30 mph the truck spiked, redlining above 260. After starting it up, it quickly started to overheat again until we hit the freeway speeds and all was good. This behavior continued up until we hit our destination. Thankfully, my mechanic brother-in-law was camping with us. He thought it was the fan clutch but after looking at the radiator, I was about 2.5 gallons low on coolant. Since we were out camping, I used the rest of the gallon I had and filled the rest up with water. Brother-in-law said the water pump looked like it was running good and it might have just been under-filled when my uncle replaced the radiator. Ran ok until we slowed down off the freeway. It looked like the coolant would get hot and boiling out of the reservoir. I just kept topping off the radiator and driving home (picked up coolant 50/50 on the way back) Looked at it at home and noticed a leak above the drain valve. Tightened the valve about 1/4 turn, filled up the radiator and again the truck ran fine until our next trip. Same problems, had someone bring out a new radiator cap since it looked like the coolant was not being pulled back into the radiator. Coming back we had the same problem. I since replaced the hose from the radiator to the reservoir and "burped" the system by running the truck and squeezing the upper radiator hose until the coolant level would no longer drop in the radiator. The oil looks really clean (not milky or showing signs of water/bubbles). Coolant looks clean and I have topped of the radiator last with concentrate coolant to account for the water I added before. So I don't think it's the head gasket. I rotated the fan with the truck off and it stopped immediately after letting go. There wasn't any play when I tried moving the fan around so I don't think it's the fan/fan clutch. I hear an electric fan on when it's overheating/hot and the fan clutch kick in when its really hot. Rather than purchasing a bunch of new parts I thought I would get on here and ask a couple questions and see if anyone might have some things to try out. Would having enough air in the cooling system keep the coolant from being sucked back into the radiator? Could the fan clutch not be engaging at a low enough temperature? If the radiator is a 2 core, would that cause the coolant to boil enough to cause an air gap that would then keep coolant from being pulled back into the radiator? This truck was originally purchased new by my grandpa in 1991. He was a mechanic and took amazing care of the thing (all receipts). My Uncle purchased it from him a couple years back and I believe it was just sitting on his property for most of the time. -
LML has coolant coming out of reservoir outlet on top and side of reservoir
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Have any of you been able to get GM to cover radiator leaks beyond the b2b warranty? I have 40k on mine and was just informed I have a leak. I noticed they extended the warranty on 14 and 15’s but I’m not seeing any newer models being covered. -
Any one have a clue why my 2005 silverado pukes all the coolant out the overflow hose from the coolant tank once the engine warms up ? -
Have a leak from the back of the motor that is getting worse. I collected some of it today and it's anti-freeze. I was thinking it was from near the front of the engine but parked it in the driveway and the puddle is near the back. I do have to add coolant; maybe went through a gallon over the last 12/18 months. It also does use oil, maybe a quart over 3000 miles. I thought it was also leaking oil but this coolant did not appear to have any oil with it. It's an 02 with 240K on it and I've had it for about 4 years. I've never really worked on an LS motor so advice would be great. -
Hey guys, Encountered a coolant leak at the heater hose quick connect fitting on a 2005 Tahoe. I had one of these snap last year on my ‘05 Sierra so it’s a pretty common occurrence on NBS models that are still on the road. I made a video of what I ran into while replacing the fittings that I think will be helpful to someone that needs to tackle the same thing. Let me know now what you guys think: Video / Replacing GM Heater Hose Quick connectors -
freeze plug Busted freeze plug
Chris510 posted a topic in 1988-1999 Chevrolet & GMC C/K GMT400 Platform
I have a leak that I could not find where it was exactly coming from, the only thing I could see is that it was running down the starter so after reading some of you guys' comments about think it could be a freeze plug I decided to get under the truck today and take the starter out to see if I could find something out and sure enough the freeze plug right behind the starter was leaking, I tried to tap on one side of it with a crew driver so that section could bend in and make the other side pop out but instead the screwdriver made a hole and as I moved the screwdriver to another section of it, it just kept on making the hole biggerso now its halfway busted but no signs of it coming one bit loose. How do I get it out ? Any help would be really appreciated thanks -
Facts: Just started this winter I park slightly inclined, but have since stopped parking inclined. Did not seem to be a factor Noticed very small puddle of coolant under engine Reservoir was low, added coolant, reservoir is low again about a week later Started the truck up, and waited until I saw a bead/drop of coolant. Took a pic. The bead coolant appeared on the line that goes in and out of the passenger side firewall. See pic. During the winter, it did seem to take a while for the heater to warm up When using the heater I tend to leave the A/C system on. When I use the heater i hear a fluid-like sound from the passenger side, as if there is suction loss I know very little about the workings of the cooling system. Does the cooling system involve the heater or A/C system at all? Any assistance is appreciated!
