C6 overheating.
#1
C6 overheating.
Model: C6 (convert, stick shift)
Year: '07 (LS2 motor)
After a cold start and while idling, the temp stays at 90C- 94C (194F- 201F) even if I let it idle for say 20 mins, the temp stays constant. But once I pull it out of the drive way and a few minutes in driving around the block. The temp both at the gauge and the DIC continues to rise and the coolant starts flowing out due to high boiling pressure from underneath the reservoir cap through the tiny hole
what could be a possible issue? the Fan fuse? I did replace the fuse but can't make sure if the fan is running or not, how could you make sure the cooling fan is running. Will turning on the A/C triggers the fan?
Maybe a bad temp sensor? sometimes while over heating the temp gauge starts fluctuating just right before the 'Engine Hot A/c shutting down' message pops up in the DIC.
An air pocket or vacuum in the block/cooling system and how to bleed if thats the case?
A blown headgasket? I checked and the engine oil isn't mixed with water.
A broken cylinder head. lets hope thats not the case
A few days back after changing the starter motor I took the car out for a spin, totally forgetting the cooling fan fuse had to be replaced since the original 60A fuse was broken. About 30 mins later the car overheated while I was stuck in the traffic and thats when I realized I didn't replace the fuse. drove the car back home ( I was just 10 miles away) maybe driving the overheated car 10 miles did some damage not sure tho. I kept stopping every 2-3 miles waiting 45 mins during the intervals to let the engine cool down naturally but ever since the engine oil has turned dark and the dip stick is very low on engine oil the DIC as well shows "low oil level" and oil temperature low message when I run through the options to check coolant temperature and battery voltage. Any help= highly Appreciated!
Year: '07 (LS2 motor)
After a cold start and while idling, the temp stays at 90C- 94C (194F- 201F) even if I let it idle for say 20 mins, the temp stays constant. But once I pull it out of the drive way and a few minutes in driving around the block. The temp both at the gauge and the DIC continues to rise and the coolant starts flowing out due to high boiling pressure from underneath the reservoir cap through the tiny hole
what could be a possible issue? the Fan fuse? I did replace the fuse but can't make sure if the fan is running or not, how could you make sure the cooling fan is running. Will turning on the A/C triggers the fan?
Maybe a bad temp sensor? sometimes while over heating the temp gauge starts fluctuating just right before the 'Engine Hot A/c shutting down' message pops up in the DIC.
An air pocket or vacuum in the block/cooling system and how to bleed if thats the case?
A blown headgasket? I checked and the engine oil isn't mixed with water.
A broken cylinder head. lets hope thats not the case
A few days back after changing the starter motor I took the car out for a spin, totally forgetting the cooling fan fuse had to be replaced since the original 60A fuse was broken. About 30 mins later the car overheated while I was stuck in the traffic and thats when I realized I didn't replace the fuse. drove the car back home ( I was just 10 miles away) maybe driving the overheated car 10 miles did some damage not sure tho. I kept stopping every 2-3 miles waiting 45 mins during the intervals to let the engine cool down naturally but ever since the engine oil has turned dark and the dip stick is very low on engine oil the DIC as well shows "low oil level" and oil temperature low message when I run through the options to check coolant temperature and battery voltage. Any help= highly Appreciated!
Last edited by Den_Chaze; 09-09-2017 at 05:18 PM.
#3
Cruising
I just had this happen on my 09 Z06it was a bad solid state relay switch on next to the fan. Info getting from computer to switch but not to fan. I also learned not to mix antifreeze types red/green gold as they have different corrosion inhibitors and when mixed can cause a jello slurry that can clog the system. Got mine to an engine builder who said springs in the head may be softer and piston rings may be warped. Good luck I feel your pain.
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Den_Chaze (08-28-2017)
#5
The fan is not turning on despite a new cooling fan fuse [60A, #25 in the fuse box]. I let the car warm up for good 10 minutes then drove around the block, stopped, openned the hood the temp kept rising past 220 mark but the fan never turned on. And again as usual the water in the coolant boiled up and found its way out.
#6
I just had this happen on my 09 Z06it was a bad solid state relay switch on next to the fan. Info getting from computer to switch but not to fan. I also learned not to mix antifreeze types red/green gold as they have different corrosion inhibitors and when mixed can cause a jello slurry that can clog the system. Got mine to an engine builder who said springs in the head may be softer and piston rings may be warped. Good luck I feel your pain.
#7
#8
Team Owner
Fan connector is a VERY VERY common issue. It melts and then fan won't kick on. Unplug the fan and look at the connectors.
#9
5th Gear
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#10
Alright the issue isn't resolved yet. The cooling fan runs (did a direct connection just to make sure it runs). Removed the thermostat as I thought it might be blocking the circulation but still no luck. The water starts spilling out once the car is warmed up despite the running fan.
Last edited by Den_Chaze; 09-09-2017 at 05:25 PM.
#11
I'll try bleeding the coolant system tomorrow. Once it's bled, I'll go ahead and have a look at the water pump and also install a new tstat. This should pretty much resolve the issue as I'm quite sure it's not the head gasket. I don't see any water spots or milky texture on the dip stick or oily texture in the reservior, I also don't notice any steam off the exhaust so I'm assuming it's not the head gasket
#12
So I pulled out the waterpump, it looked pretty much waste. And here's the list of parts I'm done buying
1) New USMW waterpump
2) New Thermostat
3) New reservoir cap
Also done diagnosing the radiator since I had it pulled out. no blockage in the radiator whatsoever
I hope the new parts fixes the overheating issue. Any comments?
1) New USMW waterpump
2) New Thermostat
3) New reservoir cap
Also done diagnosing the radiator since I had it pulled out. no blockage in the radiator whatsoever
I hope the new parts fixes the overheating issue. Any comments?
Last edited by Den_Chaze; 09-10-2017 at 07:21 AM.
#13
Team Owner
Member Since: Jun 2005
Location: Northern, VA
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St. Jude Donor '15
"In honor of jpee"
Presume when you direct-wired the fans the connector didn't look like the pic above from nick? Seems like you have the right parts, only caution is the burping isn't seamless (one-time only), may take a little extra to get the air bubbles out. Not unusual for many cars to.
So, you might be filling overflow, running, filling, running.
BTW, how many miles and what climate is car used in (desert, snow?)
So, you might be filling overflow, running, filling, running.
BTW, how many miles and what climate is car used in (desert, snow?)
Last edited by AORoads; 09-10-2017 at 08:02 AM.
#14
Presume when you direct-wired the fans the connector didn't look like the pic above from nick? Seems like you have the right parts, only caution is the burping isn't seamless (one-time only), may take a little extra to get the air bubbles out. Not unusual for many cars to.
So, you might be filling overflow, running, filling, running.
BTW, how many miles and what climate is car used in (desert, snow?)
So, you might be filling overflow, running, filling, running.
BTW, how many miles and what climate is car used in (desert, snow?)
Anyways back to the story. After installing the new parts the temp stays at 200F- 217FMAX (which I'm assuming is normal, or is it not??). Now the only problem, the fan is direct-wired. Since the overheating issue is resolved (pretty much) I need to get the fan work like the way its suppose to. Its a hassle to connect/remove the wire off the battery everytime I need to drive/park.
What could be a possible culprit.
1) The Siemens PWM Pulse Width Module (Fan controller)
2) ECM
3) Temp sensor
I welcome if there are any reference links on the forum. I'm trying to figure out the issue before sending it out to the dealer
Last edited by Den_Chaze; 09-14-2017 at 02:18 AM.
#15
Team Owner
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Location: Northern, VA
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St. Jude Donor '15
"In honor of jpee"
Might look at post #12 here for insights from an actual fan mfr.
https://www.corvetteforum.com/forums...post1595557208
https://www.corvetteforum.com/forums...post1595557208
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Den_Chaze (09-14-2017)
#16
Team Owner
Fan is driven off ECU. So if the dash is reading correct temp, and tune isn't messed up, then only thing left is the PWM module.
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Den_Chaze (09-14-2017)
#17
#18
Might look at post #12 here for insights from an actual fan mfr.
https://www.corvetteforum.com/forums...post1595557208
https://www.corvetteforum.com/forums...post1595557208