07-31-2015, 01:57 PM | #1 |
Drives: 2010 Rally Yellow 2SS/RS Join Date: Jul 2011
Location: Boston, MA
Posts: 417
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Fan seems to constantly run, and A/C performs poorly...2010 SS
Can anyone point me in the right direction? The engine fan in my 2010 SS seems to be constantly running. Now if I'm not mistaken, on most cars the fan will turn on automatically if the A/C is on....but seems to run constantly regardless of A/C. It also seems to stay on for sometimes a minute or so after I turn the car. Operating temps seems normal.
The second issue (which may be related), is my A/C has started to really suck. Fans blow great, but the air is kind of lukewarm. If I leave it on full blast, I'll drive for several miles and then all of a suddenly it kicks in perfectly. But the issue is more than it getting warmed up....for example I'll drive for 20-30 minutes, stop for a coffee, and when I get back in the car it's lousy A/C again and then a few miles down the road it is ice cold. Any ideas? I'm wondering if there's a relay or something that might be effecting both of these issues.... |
07-31-2015, 02:38 PM | #2 |
Drives: 2012 2LT RS Join Date: Feb 2013
Location: Baltimore
Posts: 227
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I've been experiencing your second problem. I got my blower motor replaced because ti was squeaking like crazy, however, now my A/C seems to suck compared to before. Not only is the air warm for a while, but my fans also seem to be blowing less than before.
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08-02-2015, 01:48 AM | #3 |
Drives: 2010 2SS/RS Join Date: Jan 2013
Location: Ontario, Canada
Posts: 100
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Have you changed/checked your cabin air filter?
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08-02-2015, 11:07 AM | #4 |
Drives: 2011 Black SS M6 Join Date: Oct 2010
Location: Harpers Ferry, WV
Posts: 1,116
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Several things can cause the AC to flip flop between luke warm air and ice cold air. The compressor clutch could be going, the charge in the lines could be just low enough to cause the high/low side value to not open/close, etc. It could even be the relay in the fuse box.
Find a good AC shop if you're out of warranty and let them give it a good look. |
08-02-2015, 11:31 AM | #5 |
Drives: 2010 SSII w RS & Sunroof Yellow Join Date: Aug 2009
Location: West Suburbs of Chicago, in a Courthouse Somewhere
Posts: 953
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ditto, um Houston, we have something venting out of the side of the ship, I can see it appears to be a white gaseous substance.. Check t out with an AC shop
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08-03-2015, 01:10 PM | #6 |
The Mechanic
Drives: a sports car Join Date: Dec 2011
Location: Louisiana
Posts: 316
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Yellow Camaro,
What is the temperature differential between the outside air and the air coming out of the air vent in recirculate and max cool setting? If it's within 20-30 degrees then its normal. Especially during the summer time heat. The fans can remove only so much heat when you're stationary. I'll explain things better when I'm off the clock. |
08-05-2015, 12:44 AM | #7 | ||
The Mechanic
Drives: a sports car Join Date: Dec 2011
Location: Louisiana
Posts: 316
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Quote:
As for the fans staying on after the a/c system has been disengaged may be tied to engine coolant temperature. Quote:
It wouldn't hurt to get the system pressures/charge checked given the age of the car. Doing so will reveal if there are any issues at hand. I hope this laymens description on what's going on behind the scenes helps in your understanding on how a HVAC system works. As I stated before, typical temperature differentials should be around 20-30 degrees. I'm not sure what settings you are using but make sure the recirculate option is enabled. This allows the system to cool just the cabin air instead of having to cool hot ambient air. Last edited by cajun1le; 08-05-2015 at 11:47 PM. Reason: grammar corrections |
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08-06-2015, 11:51 AM | #8 |
I see a much greater temperature differential of almost 50-55 degrees in both of my GM vehicles. My inside temp gauge regularly reads close to 40-43 with outside temps nearing 100.
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08-06-2015, 08:57 PM | #9 |
The Mechanic
Drives: a sports car Join Date: Dec 2011
Location: Louisiana
Posts: 316
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Indeed, and you will eventually. When I stated the 20-30 degrees temperature differential, that is measured while the vehicle is stationary, vent selector in recirculate with both door windows down. During normal conditions and once the system normalizes the air within the cabin (70-76 degrees). The differential can be greater with discharge temperatures in the 40's. On our cars there is a transducer sitting on the discharge side of the evaporator. Once it senses that the expansion valve is not able to restrict the liquid refrigerant to the core it will interrupt the compressor clutch until temperatures rise just above freezing and then engage the compressor once again.
Last edited by cajun1le; 08-06-2015 at 09:11 PM. |
08-09-2015, 12:37 AM | #10 |
Drives: 2011 Camaro 2SS/RS Join Date: Oct 2013
Location: San Jose, California
Posts: 1,371
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I had a similar issue on my Suburban a few years ago. Turned out to be the engine coolant temperature sensor. It was sending incorrect temperature readings to the ECU. It was reporting that it was almost overheating, so the fans were constantly running trying to cool the engine and the A/C wasn't working as it should because the ECU thought the engine was overheating, so it was cutting off the A/C compressor. Took less than $20 to fix.
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06-04-2018, 11:26 PM | #11 | |
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CCW sp16a track set, BTR stage 3 cam and kooks longtubes with high flow catsLocks@7.5 degrees castor and radius arm inserts, Ride Tech 2coilovers JDP upper control arm bushings BMR lower knuckle bushing Bo White throttle body3.91 gears Spohn del-sphere toe link and trailing arms Prothane subframe bushings
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06-04-2018, 11:28 PM | #12 | |
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CCW sp16a track set, BTR stage 3 cam and kooks longtubes with high flow catsLocks@7.5 degrees castor and radius arm inserts, Ride Tech 2coilovers JDP upper control arm bushings BMR lower knuckle bushing Bo White throttle body3.91 gears Spohn del-sphere toe link and trailing arms Prothane subframe bushings
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06-05-2018, 09:06 PM | #13 | |
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CCW sp16a track set, BTR stage 3 cam and kooks longtubes with high flow catsLocks@7.5 degrees castor and radius arm inserts, Ride Tech 2coilovers JDP upper control arm bushings BMR lower knuckle bushing Bo White throttle body3.91 gears Spohn del-sphere toe link and trailing arms Prothane subframe bushings
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