Jump to content

2017 Sierra Fans and AC not working

minkota
 Share

Recommended Posts

minkota New Member

minkota

Posted
Posted

I recently purchased a 2017 Sierra, suddenly the AC stopped blowing cold. I went to check the refrigerant level when I realized the radiator fans are not turning on. I I disconnected the Coolant sensor and the fans will come on as expected. all fuses and relays test good. I replaced the Coolant Sensor just for piece of mind since I just purchased the truck but it made no difference. also the temp on the gauge will not go above 210 even though the fans are not turning on (not sure I believe the gauge). 

If anyone else has had this issue, I could sure use some help on where to check next. Thanks

richard wysong Senior Enthusiast

richard wysong

Posted
Posted (edited)

As always check for codes. A good scan tool will tell you if the fans are commanded on or not and will tell you actual coolant temps

Edited by richard wysong
minkota New Member

minkota

Posted
  • Author
Posted
2 hours ago, richard wysong said:

As always check for codes. A good scan tool will tell you if the fans are commanded on or not and will tell you actual coolant temps

There is no Check Engine Light and there are no Codes when using a Scan Tool.

richard wysong Senior Enthusiast

richard wysong

Posted
Posted

the fans probably don't kick on til over 230, most of the country is cold right now so sitting idling it may not get hot enough to trigger them on. If your scan tool does live data you can monitor the coolant temp and see when they are commanded on. As far as them not running with the a/c on it could be a bad high pressure switch. Best to follow the trouble tree in the FACTORY service manual

minkota New Member

minkota

Posted
  • Author
Posted
22 hours ago, richard wysong said:

the fans probably don't kick on til over 230, most of the country is cold right now so sitting idling it may not get hot enough to trigger them on. If your scan tool does live data you can monitor the coolant temp and see when they are commanded on. As far as them not running with the a/c on it could be a bad high pressure switch. Best to follow the trouble tree in the FACTORY service manual

77 degrees here in South Florida today, it doesn't take long to reach 230 with no cooling fans. the fans continue to no come on. engine temp reached 245 (per scan tool) when I shut truck off.

minkota New Member

minkota

Posted
  • Author
Posted
17 hours ago, mikeyk101 said:

What did you discover when you checked the refrigerant level?

Compressor will not Engauge while the fans are inoperable so I am unable to get a reading right now. I guess I could force the compressor on, but its not the main concern. i am not sure if the non-working AC is a symptom or the cause. 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,879
    Total Members
    8,960
    Most Online
    Bert 22
    Newest Member
    Bert 22
    Joined

  • Who's Online   2 Members, 0 Anonymous, 775 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      Do you remember that Harley Davidson was more successful (solvent) when it produced about 60% of the market demand (by design) and forced wait times of up to three years? Even when your turn came around it was, "Take what we are giving you or move to the back of the line and start over". HUGE markup's were 'normalized' and dealer killed. 40% markup and no floor plan? What's not to love? Greed will kill them yet. They have surplus production and customer base is tanking. And still they think nosebleed pricing will work.  
    • newdude
      Me too……..

      By newdude · Posted

      The engine was done as part of the 6.2 recall?   You'd have to see if your VIN also has the 6.2 engine special coverage on it.  Coverage number is N252494003.  If you have this, your engine is covered under this and NOT the GM replacement part engine warranty which is 3yr/100k from the date of install.  The 3yr/100k mi warranty is in effect for non warranty purchases.     This is not any different if it was replaced under warranty without a recall or special coverage.  So if you had a 5.3 and it popped at 3 years in at 50,000mi during the 5yr/60k powertrain, the replacement engine would not get the 3yr/100k, and instead gets the remainder of the 5yr/60k as coverage.     So N252494003 gives 10 years or 150,000mi of coverage, which ever comes first, starting at the vehicle in service date.  So if your in service date is 01/01/2022, N252494003 gives you special coverage of the engine until 01/01/2032 or 150,000mi, whichever comes first.  So if your start date was 01/01/2022, you'd have left 5 years and 4 months (lets round to august 1st), or 62,000mi left of coverage.   So you need to know your in service date to know how much coverage is left.  
    • CamGTP
      Injector update

      By CamGTP · Posted

      Okiee dokie there bud, way to take things to the extreme.   I guess you missed the whole point and take things way to serious. I installed different EV6 style injectors that just so happen to be larger in my car running the same LQ4 engine and with a better spray pattern than the stock style injectors and I noticed no difference in the idle quality. Kinda was my round about way of saying that even if you put the same size but better style injectors in your truck, you will likely see the same thing.    I'm sure you're great to have conversations with in person if that's how you act through a keyboard. One little things sets you off and now I guess my dick is all up in your face.
    • richard wysong
      Injector update

      By richard wysong · Posted

      WoW
    • taze
      Me too……..

      By taze · Posted

      I can't believe that could possibly be the case. It should be 36mo/100k miles from installation. Then again, it also seems like since a dealership installed it, it'd all be in the system and you wouldn't need to worry about registering, either. Shows you what I know. 😄 Hope this one outlives the warranty!

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...