- #11 of 52
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2003 Chevrolet Silverado 5.3 Z71 Losing coolant
by arkz71
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Jan 30, 2007 (7:53 pm)
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I have 95,000 miles and I am losing coolant I have not seen any on the ground nor leaks on the composite intake manifold. Is there any known problems with the 5.3 have head gasket problems or any other coolant loss problems. I have not had any engine problems out of it or coolant in the oil. Any help would be greatly appreciated.
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- #12 of 52
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Re: 2003 Chevrolet Silverado 5.3 Z71 Losing coolant [arkz71]
by iowahunter
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Jan 31, 2007 (4:54 pm)
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Replying to: arkz71 (Jan 30, 2007 7:53 pm)
Have had the same issue for the last couple of months, I would have to put in about a pint or less every month and couldn't see it on the garage floor or find it on the truck anywhere, could smell it once in a while. Took the truck in for a 4x4 problem and they discovered the water pump had a small leak, sounds as if you would see that but I never did. Had it replaced and all is good now. Do not let it go too far and get stranded if this is what it is. Hope this helps and good luck!!!
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- #13 of 52
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Re: 2003 Chevrolet Silverado 5.3 Z71 Losing coolant [iowahunter]
by arkz71
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Jan 31, 2007 (6:49 pm)
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Replying to: iowahunter (Jan 31, 2007 4:54 pm)
Water pump has been replaced already, I hope it is not the Intake Manifold gaskets I have read on the internet that they leak. The Intake is composite plastic and since the whole system is under pressure with NO radiator cap (dumb) it is just a pain. I guess the EPA mandated this stupid setup, I have not seen any coolant on the ground and just trying to figure out where it is going.
Thanks
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- #14 of 52
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Re: 2003 Chevrolet Silverado 5.3 Z71 Losing coolant [arkz71]
by iowahunter
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Jan 31, 2007 (8:03 pm)
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Replying to: arkz71 (Jan 31, 2007 6:49 pm)
Man if you are not seeing it in the oil and you are not seeing it burning, I'm not sure. How often are you putting coolant in? I have a buddy that has a 02' and he said he loses it in the winter but not in the summer, he took it in and they could find nothing on it either. gotta be going somewhere??? I'll ask a buddy of mine that lives up north, he see's it all in his job, should talk to him tomorrow evening, he's kind of our mister fix it when we cannnot figure it out.
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- #15 of 52
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Re: 2003 Chevrolet Silverado 5.3 Z71 Losing coolant [arkz71]
by ahoron
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Feb 01, 2007 (1:15 am)
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Replying to: arkz71 (Jan 31, 2007 6:49 pm)
Thr intake on your engine does not have coolant running thru it. The throttle body has 2 small coolant lines.
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- #16 of 52
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Re: 2003 Chevrolet Silverado 5.3 Z71 Losing coolant [iowahunter]
by arkz71
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Feb 01, 2007 (6:12 am)
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Replying to: iowahunter (Jan 31, 2007 8:03 pm)
Thanks a bunch, I added about a 1/4 of a gallon to the coolant tank but the dash will display low coolant, it has 95,000 miles on it. I have an extended warranty and they replaced the water pump about 60,000 because it was leaking around the base of the pump itself. It did not start losing coolant till around 90,000 or so. Plus the coolant was changed, when the other work was done, I would have done the work myself but the warranty deductible was only $100 and it was cheaper than buying the stuff myself.
It has been a very good truck and I like it just wish I knew if it was the intake or something else.
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- #17 of 52
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loss of coolant/axles seals leaking
by gray01
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Feb 19, 2007 (4:23 pm)
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I have a 2001 silverado with the 4.8 in it. Once in a while I can smell anti-freeze but cannot see it. The other day my wife had it and the low coolant light came on. It had not shown any leaks or puddles on the ground until recently. I've read some of the forums here and it suggests the water pump might be bad or leaking. Also the front axle drips a little bit of oil on the ground right where the drive axle comes out of the front differential. Could the seals be bad? What could I expect to pay to have these changed. 
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- #18 of 52
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Re: loss of coolant/axles seals leaking [gray01]
by geo9
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Feb 20, 2007 (10:02 am)
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Replying to: gray01 (Feb 19, 2007 4:23 pm)
You could possibly have a cracked or leaking heater
core. Usually thats when you can smell it.
Do you notice any fogging of the windows?
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- #19 of 52
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Re: loss of coolant/axles seals leaking [geo9]
by gray01
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Feb 20, 2007 (5:51 pm)
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Replying to: geo9 (Feb 20, 2007 10:02 am)
no window fogging, I laid cardboard under it and it leaves small puddles right under the engine in the middle ofthe front wheels as well.
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- #20 of 52
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1989 K1500 Thermostat opening late?
by chosos
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Mar 15, 2007 (4:07 am)
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