Jump to content

Fan running too much on '01

Lo Ry Da

Recommended Posts

Lo Ry Da Enthusiast

Lo Ry Da

Posted
Posted

My '01 seems like the fan runs all the time.  It has been colder than %* here in Nebraska & my fan runs from the start in the garage.  A friend has a '01 Chev & it doesn't seem to do it.  Does anyone know if there is a TSB or something that addresses this?

Shaners Senior Enthusiast

Shaners

Posted
Posted

I approached my dealer when I had my truck in for service because I couldn't understand why if it was ten degrees outside and I started my cold motor that the clutch would engage after about 30 seconds and the fan would start turning at full speed.  He said it was "normal".  My service manager is very good and I trust him, but I guess I don't necessarily agree with him.  If you find out anything more let me know and I'll take my truck back in.

Z45 Senior Enthusiast

Z45

Posted
Posted

Are you talking about the engine fan or the A/C heater fan?  The engine fan on my 2001 GMC Ext Cab 4Wd is driven, not electric.  

Lo Ry Da Enthusiast

Lo Ry Da

Posted
  • Author
Posted

Definitely the engine fan.  Sorry I didn't make that clear.  Mine just seems to run all the time.  It only shuts down when the RPM goes high.  I can drive around town & it just doesn't seem to stop.  Hasn't this got to be the sign of a bad fan clutch??  The disturbing thing is, I got a 2000 GMC 4x4 as a loaner when my wifes Tahoe needed repair & it did it almost as much.

Shaners Senior Enthusiast

Shaners

Posted
Posted

I'll start my truck cold (32 degrees) and drive it about a block before the fan clutch disengages (sp?) and the the fan stops roaring under the hood!!

2k1 2500hd Enthusiast

2k1 2500hd

Posted
Posted

The clutch is a viscous coupling. That is it uses a fluid that changes properties with temperature. The warmer it gets the thicker the fluid gets. This causes the clutch to engage and cool the engine. It also works in reverse when cold, it causes the fan to engage at low RPM's. Once the engine reaches NORMAL (as in 190 degrees) operation temperature, the fan will disengage. In very cold climates the fan may never disengage. It's one of the drawbacks of a viscous coupling clutch. I hope this explains your problem.

(Edited by 2k1 2500hd at 3:32 pm on Mar. 19, 2001)

GUMPA Enthusiast

GUMPA

Posted
Posted
Quote: from Lo Ry Da on 8:42 pm on Mar. 13, 2001

My '01 seems like the fan runs all the time.  It has been colder than %* here in Nebraska & my fan runs from the start in the garage.  A friend has a '01 Chev & it doesn't seem to do it.  Does anyone know if there is a TSB or something that addresses this?

 

Rip it off ,  :)and install an Electric Fan, More engine Power, better gas mileage and better perf. when at WOT.  My 63 does not need fan even most of the time in summer unless I'm in the city. Also you won't have to listen to the silly thing.  :) Mine is switched at the dash manually so I have control by watching Water temp Gauge. Don t Like auto therm.  on/off :(   I hear little Blazers go by my house and they sound like they are going to explode ?????Tranny or fan ???they all do it !!

Z45 Senior Enthusiast

Z45

Posted
Posted

Since this post started I have been listening for my fan on my 2001 GMC 5.3L and I here nothing.   My 99 'burb had a slight roar when I drive it away from a cold start, i.e. start and go in 30 sec's.

Note--Temp here has not been above 45 F since Thanksgiving.

Turn off your A/C before you fire up and see if it improves.

(Edited by elcamino at 8:43 am on Mar. 24, 2001)

  • 5 years later...
niko11 Enthusiast

niko11

Posted
Posted
Since this post started I have been listening for my fan on my 2001 GMC 5.3L and I here nothing.   My 99 'burb had a slight roar when I drive it away from a cold start, i.e. start and go in 30 sec's. <p>Note--Temp here has not been above 45 F since Thanksgiving.

Turn off your A/C before you fire up and see if it improves.<p>(Edited by elcamino at 8:43 am on Mar. 24, 2001)

 

 

 

Mine is doing the same thing you guys are talking about. It sounds normal now that i read your posts!

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,739
    Total Members
    8,960
    Most Online
    chfkief
    Newest Member
    chfkief
    Joined

  • Who's Online   2 Members, 0 Anonymous, 1,401 Guests (See full list)

  • Latest Articles

  • Posts

    • Chuck FB
      Joke Thread

      By Chuck FB · Posted

      Fred was in the fertilized egg business. He had several hundred young pullets, and ten roosters to fertilize the eggs He kept records, and any rooster not performing went into the soup pot and was replaced. This took a lot of time, so he bought some tiny bells and attached them to his roosters. Each bell had a different tone, so he could tell from a distance, which rooster was performing. Now, he could sit on the porch and fill out an efficiency report by just listening to the bells. Fred's favourite rooster, old Butch, was a very fine specimen, but this morning he noticed old Butch's bell hadn't rung at all! When he went to investigate, he saw the other roosters were busy chasing pullets, bells-a-ringing, but the pullets, hearing the roosters coming, would run for cover. To Fred's amazement, old Butch had his bell in his beak, so it couldn't ring. He'd sneak up on a pullet, do his job and walk on to the next one. Fred was so proud of old Butch, he entered him in the City Show and he became an overnight sensation among the judges. The result was the judges not only awarded old Butch the "No Bell Piece Prize," but they also awarded him the "Pulletsurprise" as well. Clearly old Butch was a politician in the making. Who else but a politician could figure out how to win two of the most coveted awards on our planet by being the best at sneaking up on the unsuspecting populace and screwing them when they weren't paying attention. Vote carefully in the next election, you can't always hear the bells.
    • chfkief
      FS: Black Bear Performance AutoCal Tuning System

      By chfkief · Posted

      Do you still have?
    • 3CarSeatDad
      High Country Suburban build confirmation

      By 3CarSeatDad · Posted

      Can someone confirm if the GM order workbench terminal is able to validate a custom build sequence:   1) Initialize the Allocation Base: Open a new vehicle build queue, select the 2026 Chevrolet Suburban 4WD, and pick the High Country (3LZ Preferred Equipment Group).   2) Select the Diesel Powertrain: Go directly to the engine configuration screen and choose RPO code LZ0 (3.0L Duramax Turbo-Diesel). Ensure it maps to the MHS 10-speed automatic transmission.   3) Deploy the Seating Swap: Navigate to the Interior Options screen and enter RPO code ATT to replace the standard captain's chairs with the power-release 60/40 bench seat. Because you are not trying to force a separate luxury or air-suspension bundle, the standard, premium D07 Fixed Floor Console remains active. The system will accept this change immediately without triggering a warning message.   3)Apply Heavy-Duty Hauling Capability: Input RPO code NHT (Max Trailering Package). The commercial terminal will automatically bundle the required trailering hardware and software modules to support the diesel engine's maximum towing capacity.   5) Layer the Premium Tech and Glass: Separately add code C3U (Panoramic Power Sunroof) and code UKL (Super Cruise) to the order screen.   6) Run the Final Validation: Click the "Validate Order" button at the bottom of the interface.
    • revmanii
      Looking at ordering a '26 WT because I want a std cab, std bed

      By revmanii · Posted

      Spent the last hour or 2 googling and reading up on the spacer thing. I don't like the loss of thread contact on the slip on spacers, but it appears you can get "extended" lug nuts that reach into the hole of the wheel to get back the lost threads. Looks like the only true hubcentric slip on spacers are at least .375". I'd want as little as I could get away with and don't want to cause other clearance issues going any thicker. Bora seems to offer what appears to be a well made .375" spacer and extended lug nuts. I searched here and did find a couple threads recommending Bora. But not cheap. By the time I buy spacers and lugs, new TPMS sensors, then pay a tire shop to install the new sensors, I suspect I'm going to be in over $400. Thinking about running out and getting some washers to put behind the wheel to see if .375" is enough to clear calipers, turn lock to lock without rubbing, and to see if the wheels/tires look strange pushed out a little. This would just be to check fitment.
    • Core-Lokt
      Road Master Active Suspension

      By Core-Lokt · Posted

      Roadmaster makes some quality parts; I have their sway bar. I considered the RAS, but I ended up bagging. I didn't know what kind of ride I'd get with RAS, and the bags have interior jounce bumpers, so I can run 0 pounds pressure. I figured I'd have the best of normal suspension ride with assist on-demand. But it seems you got pretty much the same in one item.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...