Q7 4.2 is starting to overheat
#1
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Q7 4.2 is starting to overheat
Hey there I need some advice in trying to figure out what's wrong with my Q7.. I'll start from the beginning. About a month ago I installed giant Swedish "extra lights" for my trip into the Adirondack Mountains. The Q7 performed flawlessly and even drove it up whiteface mountain which is the highest drivable peak in NY. The entire trip I watched the temp guage because I was worried the lights would hurt air flow. But the car's temp never rose. Even when driving up the mountain
Fast forward to yesterday, I pulled into the driveway and noticed the Q7 sounded strange. The cooling fan for the engine was running at full power. And when the Q7 was idling it sounded like a jet turbine because the fan was running so fast. Lol. And the temp guage was creeping close to the "H". So I immediately believed that my extra lights caused this. So I removed them and figured I solved it. Well, nope. On my way to work this morning I noticed the temp guage rising again. and it was rising very fast but luckily I was almost to my destination. But this didn't happen until after 15 miles of driving with a normal temp. So there is something going on where the car can't keep itself cool after a little while of driving. But can for the beginning of the drive
I'm gong to go check the coolant level in a little bit because I was letting the car cool down earlier. If it's not coolant could it be a water pump? I believe my Q7 is still on the original waterpump. Any tips would be greatly appreciated. Anyone have any similar issues to this with any car?
Also I ran a scan and there's no faults, only the High Pressure Switch G65 sensor for my AC.. could that be linked?
Fast forward to yesterday, I pulled into the driveway and noticed the Q7 sounded strange. The cooling fan for the engine was running at full power. And when the Q7 was idling it sounded like a jet turbine because the fan was running so fast. Lol. And the temp guage was creeping close to the "H". So I immediately believed that my extra lights caused this. So I removed them and figured I solved it. Well, nope. On my way to work this morning I noticed the temp guage rising again. and it was rising very fast but luckily I was almost to my destination. But this didn't happen until after 15 miles of driving with a normal temp. So there is something going on where the car can't keep itself cool after a little while of driving. But can for the beginning of the drive
I'm gong to go check the coolant level in a little bit because I was letting the car cool down earlier. If it's not coolant could it be a water pump? I believe my Q7 is still on the original waterpump. Any tips would be greatly appreciated. Anyone have any similar issues to this with any car?
Also I ran a scan and there's no faults, only the High Pressure Switch G65 sensor for my AC.. could that be linked?
Last edited by D3Audi; 07-26-2017 at 06:37 AM.
#2
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Just checked in the reservoir. I can see coolant in there but it's a little below the 'min' part. Is this considered low? Would this cause my engine temp to increase? I'm trying to post a picture but the new forum layout won't let me like I used to be able to.
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thanks for the tips! Just checked eBay and it seems a thermostat is around $75+... I wonder if this is something I can replace myself or have my mechanic do?
#6
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Originally Posted by D3Audi
thanks for the tips! Just checked eBay and it seems a thermostat is around $75+... I wonder if this is something I can replace myself or have my mechanic do?
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#10
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Always scan the car for fault codes to see what it will reveal. This requires a VAG-compatible scantool to read the hidden trouble codes on this car. Both times I've ever experienced overheating problems, it was always related to the coolant fan's controller/rheostat going out, which can be difficult to discern for the uninitiated. Classic symptoms of a cooling fan outage include...one electric fan running at maximum because the other one is not running at all; temp creeps up steadily when driving at modest or stop/go type speeds, but if driving at higher/highway speeds there's generally enough airflow forced through the radiators to keep the temp down...until you slow down again.
Sure, sometimes a thermostat gets stuck closed/fails, but you can easily turn the heat on full in the car to see if you are passing hot coolant through the car's thermostat or not, as well as reducing the immediate strain on the car's cooling system, if you see the temp gauge rising, etc. It's also pretty easy to open the hood and verify if both cooling fans are running or if just one is running, yes? If a fan isn't running when the car is heating up, that's your issue.
Sure, sometimes a thermostat gets stuck closed/fails, but you can easily turn the heat on full in the car to see if you are passing hot coolant through the car's thermostat or not, as well as reducing the immediate strain on the car's cooling system, if you see the temp gauge rising, etc. It's also pretty easy to open the hood and verify if both cooling fans are running or if just one is running, yes? If a fan isn't running when the car is heating up, that's your issue.