Last post on May 03, 2013 at 7:11 AM
You are in the Chevrolet Silverado & GMC Sierra
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GMC Sierra 1500, Truck
#37 of 79 Re: 97 Sierra Overheating, Sound of Water, and No Heater [srtttu]
Jan 22, 2008 (7:05 pm)
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.
#38 of 79 Re: 94 Silverado coolant temperature [bowana]
Jan 30, 2008 (6:23 am)
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.
#39 of 79 Re: loss of coolant/axles seals leaking [gray01]
Jan 31, 2008 (2:37 pm)
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,
#40 of 79 (help) thermostat
Jan 31, 2008 (2:26 pm)
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
#41 of 79 coolant leak on backside on engine
Oct 27, 2008 (5:35 pm)
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!!
#42 of 79 Re: coolant leak on backside on engine [kegabear]
Oct 28, 2008 (3:29 am)
#43 of 79 Re: coolant leak on backside on engine [obyone]
Oct 28, 2008 (5:07 pm)
doesnt seem to be leaking by the heater hoses that goes to the heater core if thats what you meant..got a better look today..seem to be coming in and all around the tranny bell housing..another post told me the block heater near the oil filter housing..dont have a block heater..are the freeze plugs on the block behind the bell housing? meaning the tranny has to come out?
#44 of 79 Re: coolant leak on backside on engine [kegabear]
Oct 29, 2008 (3:53 am)
There are two block drain plugs toward the left and right rear of the block that you could check. These are the plugs used when draining coolant from the block or to back flush.
#45 of 79 1999 GMC Yukon 5.7lt Intake Manifold Coolant Leak
Feb 11, 2009 (5:47 pm)
I have a 1999 Yukon 2WD with the 5.7 lt engine. There is cooloant leaking out of the intake manifold just behind the alternator. It is coming out of the gasket where the manifold mounts to the engine block. How hard of a project am I getting myself into? I am fairly competant and have worked on a lot of engines in the past when I used to buy/sell used cars. That was 15 years ago and now it looks very complicated. Could I be biting off more than i can chew? Are there any big "pit falls" I need to be aware of? I will not do it myslef if I have to disconnect A/C lines.
#46 of 79 Very Slow Coolant leak 2004 serria 5.3
Mar 16, 2009 (9:52 am)
I have no pressure at the expasion tank lid after driving till temp gauge reaches normal reading. I had to add about 3 quarts of Dex Coolant the other day. The level is still the same. I can't find any trace of a leak except slight smell at exhaust pipe. What are the pills someone mentioned sold by GM to stop leak? I don't want to pull intake gasket then both heads.