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08 CTS
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5 Posts
Discussion Starter #1
About 6 months ago i noticed that my fan would start running in drive throughs and at random times. at that time the temp guage was still normal. a notch right under 220. about a month ago i was in a drive through and heard the fan and looked at my guage and it was running a notch ABOVE 220, as i was watching it. the needle dropped back down to the normal temp and did not rise again but the fan stayed on until i cut the car off and then i heard another fan running for about 2-3 min or so.

Now almost everytime i drive the fan comes on and the temp gauge is beginning to do the same thing. it will rise for a min or 2 and then fall quickly back down to normal temp and run fine. no engine light and car does not seem to be runnig hot
any ideas what this could be from?
faulty temp sensor?
overheating? do i need to get addressed right away. its beginning to warm up and i dont want to over hear or anything.
 

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Thunder Gray '08 CTS 3.6 FE2 Premium
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334 Posts
I had the exact same symptoms. The fan was running a lot (although it was very hot here in Socal at the time, it still seemed to be running more than normal). Eventually after a few months I woke up to an engine light. Took it in, and the culprit was a faulty thermostat. Had the thermostat replaced and everything went back to normal - problem solved.
 

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'14 CTS-V LongRoof; '16 ATS-V Sedan,' 04 Trailblazer 4x4; '10 CTS LongRoof gone but never forgotten
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14,838 Posts
Yes, get it taken care of soon. Overheating can lead to warped heads and other major, costly items.
 

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Thunder Gray '08 CTS 3.6 FE2 Premium
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334 Posts
It was covered under my extended GM Major Guard warranty (which has since expired). But let me see if I can dig up the invoice.
 

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2010 CTS Premium Sedan, RWD/3.6 DI
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100 Posts
I had the same symptoms not long ago. Coolant was a little low. I added maybe a quart+ until it was up to the indicated cold fill line. No problems since.
 

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08 CTS
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5 Posts
Discussion Starter #7
Thanks for the updates guys, i cheked my coolant and it seems low, i can barley see any in the Reservoir , i use to have an 03 deville, that took Dex III coolant for GM's. will the same collant be fine to use on my CTS?
 

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2008 CTS 3.6 RWD LY7, FE2
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55 Posts
If you're not 100% sure what is in there, probably best to just top it off with water. Depending on mileage it may be time to flush the system and replace.
 
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