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09 Silverado overheating?
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ussessex
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Sep 6, 2013, 8:10 AM
Post #1 of 13
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09 Silverado overheating?
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I have an 09 Silverado with a 5.3L 8 cylinder just under 100k miles
Recently it has started to seem to run hot. The gauge usually runs at mid scale and now runs up to 3/4. This happens whether I am moving or sitting still. There are no outward signs of overheating other than this but I have been pulling over when it shows hot. On cold startups it seems normal for a while and then the gauge jumps up somewhat quickly. More quickly than you would expect given that changing water temperature is a slow process.
I have not seen water boiling over and the fans seem to operate normally.
The first time it happened, I let it cool for a bit and then turned on the heater to see if it had water. No heat at all from the vents. Assuming that the thermostat was bad, I let the engine cool and then went directly home to replace it. I didn't loose all of the factory colored antifreeze but did top it off with regular green antifreeze which I had on hand.
Following the replacement of the T stat, I initially saw the same result on the gauge but then burped the overflow container and added more fluid and it seemed ok. The temp dropped close to the normal temperature and I chalked up the slightly higher value to the new Thermostat.
The next day it was back to it's old tricks. Not using water at all and I have no leaks by the water pump. I have pinched the radiator hose and think I can feel flow through it. I am at the end of the road for ideas on next steps to troubleshoot. HELP!
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ussessex
User
Sep 6, 2013, 8:31 AM
Post #3 of 13
(3550 views)
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Re: 09 Silverado overheating?
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Can you please elaborate on the consequences of mixing or replacing the antifreeze?
Also, I should have added that the heater did work following the replacement of the thermostat. I have to admit though that I haven't tried it again since.
Thanks in advance
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 6, 2013, 8:54 AM
Post #4 of 13
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Re: 09 Silverado overheating?
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Dexcool will not work if it's contaminated. I have heard that it causes a gel when mixed but i have never seen that happen.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 6, 2013, 10:30 PM
Post #5 of 13
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Re: 09 Silverado overheating?
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They are both exactly ethylene glycol - no harm same crap different color only,
T
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Tom Greenleaf
Ultimate Carjunky
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Sep 7, 2013, 6:44 AM
Post #7 of 13
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Re: 09 Silverado overheating?
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That's what GM wants you to think and apparently you can't think on your own so listen to a company that required billions to bail out instead those who know WTF they are doing,
T
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Discretesignals
Ultimate Carjunky
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Sep 7, 2013, 7:46 AM
Post #9 of 13
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Re: 09 Silverado overheating?
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This is what GM says about it,
Contamination
Mixing conventional green coolant with DEX-COOL(R) will degrade the service interval from 5 yrs./150,000 miles (240,000 km) to 2 yrs./30,000 miles (50,000 km) if left in the contaminated condition. If contamination occurs, the cooling system must be flushed twice immediately and re-filled with a 50/50 mixture of DEX-COOL(R) and clean water in order to preserve the enhanced properties and extended service interval of DEX-COOL(R).
Not something I would do though. Like Dex-cool has extended service intervals anyway...LOL
Another thing I heard is that systems designed for Dex-cool you shouldn't use conventional green in because of something with water pump seal incompatibility.
Our shop uses whatever the manufacture of the vehicle recommends. We don't want to take any chances of wrecking anything because we used the wrong coolant.
The best thing to do if your low on coolant and don't have the equipment to find the leak at the time is to just pour in straight water.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Sep 7, 2013, 7:52 AM)
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Tom Greenleaf
Ultimate Carjunky
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Sep 7, 2013, 7:47 AM
Post #10 of 13
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Re: 09 Silverado overheating?
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Thank you. For once you make some format of sense,
T
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Hammer Time
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Sep 7, 2013, 9:20 AM
Post #11 of 13
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Re: 09 Silverado overheating?
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Yep, sounds pretty much the same thing I said before the nonsense started.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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ussessex
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Sep 9, 2013, 7:12 AM
Post #12 of 13
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Re: 09 Silverado overheating?
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Thanks for zeroing in on my problem of the truck overheating.
The last work performed on this vehicle was to replace the serpentine belt which was not done correctly. The belt was not slipped all the way over the harmonic balance pulley which drives the accessories. The thinking is that the belt was slipping since not fully engaged on the pulley.
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Hammer Time
Ultimate Carjunky
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Sep 9, 2013, 7:15 AM
Post #13 of 13
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Re: 09 Silverado overheating?
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Not likely at all. Serpentine belts don't generally slip. They just fly off or shred if there is a problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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