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Cooling Systems -- Problems & Solutions (Radiator, Fan, etc)

561 messages,  Last post on Nov 12, 2009 at 1:37 PM

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What is this discussion about? Engine


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#31 of 561
5.7l Tahoe coolant leak by davids1
Jun 13, 2005 (8:50 am)
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My 1999 Chevy Tahoe w/5.7 liter engine has a small coolant leak. How small??? When the vehicle sits overnight there may be a puddle of coolant approximately 4 inches in diameter directly below the bottom pulley. A small amount of coolant can be seen on the sway bar (i think).
 
I have changed the water pump, the upper and lower radiator hose, the thermostat and the two smaller hoses that feed coolant to the heater core (i think, again). I am confident the leak is not coming from one of these components as the leak is the same now as before.
 
Does anybody know what the potential source of this leak could be? There is some coolant on one of the hose couplings on the hose that connects to the transmission, but I am not convinced this is the source.
 
Thank you
#32 of 561
Re: 5.7l Tahoe coolant leak [davids1] by Mr_Shiftright HOST
Jun 13, 2005 (9:04 am)
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Replying to: davids1 (Jun 13, 2005 8:50 am)

On hard to find leaks you can always pressure test the system. Do you have a freeze plug in that location?
 
Also, one must never presume that just because a part is replaced, that this eliminates that part as a culprit.
#33 of 561
Re: 5.7l Tahoe coolant leak [Mr_Shiftright] by davids1
Jun 13, 2005 (6:12 pm)
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Replying to: Mr_Shiftright (Jun 13, 2005 9:04 am)

I don't know if there is a freeze plug down there or not. I was hoping to find somebody that had experience with the 5.7 liter chevy power plant and the location of potential leakage sources as there are certainly enough of them around.
 
As far a the repalcement parts go, I replaced them myself so I'm confident in the quality of the install. I have also verified that the leak is not coming from the new thermostat, the new hoses and the new water pump. The leak is coming from somewhere low on front of the engine.
 
Thanks again for any input.
#34 of 561
Re: 5.7l Tahoe coolant leak [davids1] by Mr_Shiftright HOST
Jun 13, 2005 (10:11 pm)
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Replying to: davids1 (Jun 13, 2005 6:12 pm)

If you pressure test it you'll probably find it.
#35 of 561
Re: 5.7l Tahoe coolant leak [Mr_Shiftright] by davids1
Jun 14, 2005 (3:58 am)
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Replying to: Mr_Shiftright (Jun 13, 2005 10:11 pm)

Is that something I can do easily myself? I don't mind getting my hands dirty, and it gives me an excuse to buy a new tool (as long as it's not too expensive).
 
Otherwise, I have a couple of shops around that could possibly do this for me.
 
Thanks again!!!
#36 of 561
Re: 5.7l Tahoe coolant leak [davids1] by Mr_Shiftright HOST
Jun 14, 2005 (6:16 am)
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Replying to: davids1 (Jun 14, 2005 3:58 am)

It's a kind of pump that attaches to the radiator. I'm not sure what it costs, but if it's cheaper than the shop's quote for a test, then why not? It's a handy tool although one doesn't use it all that much unless you are working on all your cars a lot. It's a great tool for testing your work, too. If there's a weak spot inthe cooling system, the pressure from this pump will ferret it out as it simulates a high pressure situation, such as when your engine is running hot.
#37 of 561
davids 1 by burdawg
Jun 14, 2005 (6:26 am)
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You mean it doesn't leak when warmed up and the coolant is under pressure? If so, my thought would be a leak around the intake manifold, which is very difficult to see now with all of the stuff mounted on top. Could be seeping and running down the front of the engine. A cold pressure test could help, but if it's a very small leak then it will take some time to detect.
#38 of 561
5.7l Tahoe coolant leak by davids1
Jun 14, 2005 (7:36 am)
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Thanks all. Pump systems cost about 100 bucks. I'll try to rig something up with a bicycle pump and see how that works.
#39 of 561
Overheating by stuehmer
Jun 14, 2005 (7:51 am)
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I have a 92 Toyota Camry V-6 and it is overheating. I have replaced the radiator and the thermostat. I have also spent almost 6 hours trying to "burp" the car. The furthest I can go is about 15 minutes away from home before it starts to overheat. There is still some air in the engine but I think that I have gotten most of it out. I also know that the water pump is fine. Does anyone have any other suggestions for me?
#40 of 561
Re: Overheating [stuehmer] by Mr_Shiftright HOST
Jun 14, 2005 (1:49 pm)
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Replying to: stuehmer (Jun 14, 2005 7:51 am)

That's a very fast overheat, which suggests a highly restricted water flow OR a bad head gasket OR a thermostat in backwards perhaps (sorry, don't mean to denegrate your skills, just trying to think of everything that can go wrong here).
 
Are you quite sure your electric fan is running?

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