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Chevy Silverado and GMC Sierra Radiator and Cooling Questions

52 messages,  Last post on Nov 22, 2009 at 1:51 PM

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#31 of 52 94 Silverado coolant temperature by 57bob Jan 15, 2008 (5:27 am)
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. Replies to this message: bowana (Jan 18, 2008 1:56 pm) 57bob (Jan 30, 2008 6:23 am)
#32 of 52 Re: 94 Silverado coolant temperature [57bob] by bowana Jan 18, 2008 (1:56 pm)
Replying to: 57bob (Jan 15, 2008 5:27 am) 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. Replies to this message: 57bob (Jan 30, 2008 6:23 am)
#33 of 52 coolant leaking-freeze plug issue? by beaverman Jan 21, 2008 (12:35 pm)
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.
#34 of 52 more info on coolant leak in 1998 4.3L 5-speed. by beaverman Jan 21, 2008 (3:14 pm)
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?
#35 of 52 Coolant Leak by edw6 Jan 20, 2008 (8:25 pm)
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.
#36 of 52 97 Sierra Overheating, Sound of Water, and No Heater by srtttu Jan 22, 2008 (5:57 pm)
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. Replies to this message: 1offroader (Jan 22, 2008 7:05 pm)
#37 of 52 Re: 97 Sierra Overheating, Sound of Water, and No Heater [srtttu] by 1offroader Jan 22, 2008 (7:05 pm)
Replying to: srtttu (Jan 22, 2008 5:57 pm) 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
#38 of 52 Re: 94 Silverado coolant temperature [bowana] by 57bob Jan 30, 2008 (6:23 am)
Replying to: bowana (Jan 18, 2008 1:56 pm) 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
#39 of 52 Re: loss of coolant/axles seals leaking [gray01] by chainlink Jan 31, 2008 (2:37 pm)
Replying to: gray01 (Feb 19, 2007 4:23 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 52 (help) thermostat by chainlink 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

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