P0493 "fan speed" - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 06-24-2010, 02:37 AM
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Joey04TB Joey04TB is offline
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2004 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
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P0493 "fan speed"

is this a fan clutch problem? I checked the relay and it was fine. just bought a new fan clutch for $144 and am about to put it in but wanted to know if it could be somthing else first.

-its not making noises and does not over heat

was divinvg about a week ago ago and floored through a yellow light and serv engin soon light came on along with the reduced engin power light (which has never came on befpre). i turned the car off then back on and the check engin light was still on but the reduced engin power light went away and hasnt come back. went to get a scan and P0493 came up and that was all. the car still drives fine but has the original fan clucth at 134,600 miles
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  #2  
Old 06-24-2010, 03:13 AM
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Blazernut Blazernut is offline
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That is about all it could be. You may have got used to the sound of the locked position although your mileage would have started to suck big time. It won't overheat as it will draw air through the radiator constantly at max capacity. Hence the roar of air when it locks.

I have had mine lock up twice but it never happened again. You will hear the fan roar when it locks up for good or just change it out and your Dexcool at the same time and be done with it.
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  #3  
Old 06-25-2010, 04:43 PM
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fixed "pending"

I replaced the original fan clutch and clearded the engin code so I'm just going to have to wait and see if another code shows up in the next few days. I wasnt looking forward to replacing the fan clutch because I herd all these stories on how its expensive, hard to do, run into other problems, ext. But this was prabably one of the easiest repairs ive ever done, and a little less than $160 for the part tax incuded.. its not bad at all! so anyone reading this dont be affraid of your fan clutch going out. if it was easy on an 04 with 134,700 miles, than it should be easy on any trailblazer/envoy
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  #4  
Old 06-30-2010, 05:14 AM
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Guess what.. Now I have a p0526 code. I guess this code means the computer can't read the fan at all??? I'm not to sure but I checked the conections and the relay again just in case. Guess I'll just have to take the clutch off and exchange it for another one.

I'm posting this with my I phone. I didn't think it was able to work with this site but it works well.
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Old 07-01-2010, 09:09 AM
atblack21 atblack21 is offline
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I am in the exact same boat you are in except I jsut replaced the new one with another new one and it is still giving the code. Have you figured anything out yet??
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Old 07-01-2010, 08:58 PM
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Quote:
Originally Posted by atblack21 View Post
I am in the exact same boat you are in except I jsut replaced the new one with another new one and it is still giving the code. Have you figured anything out yet??
Same code? p0526? the first code i got was p0493 so I replaced the clutch and about 200miles later the ses came back on and was p0526 which from what I read means bad or no conection to the fan. I havnt changed it out yet because of work and my car does not over heat at all so I'm not too worried about driving it. I will change it out this weekend and let you know how it goes. there are several diffrent codes for the clutch and they all mean some thing diffrent. havce you checked your relay? the relay is the same one as your headlight relay so if you switch to 2 and the headlights dont go on then you know you have a bad relay. it takes only a second to do.
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  #7  
Old 07-02-2010, 09:19 AM
atblack21 atblack21 is offline
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my code is a p1481. The clutch fan I bought apparantly had a defect, or so I thought, so I exchanged it for another one. Same brand. Still getting the same code. p1481. I have heard some bad things about the after market fan clutch I bought. OE Replacement is the brand name. I am going to return it and try a Dorman. I did switch the relays and nothing. The low beams still worked.
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  #8  
Old 07-02-2010, 01:44 PM
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GENAPRINCESS GENAPRINCESS is offline
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same here.

I replaced the fan clutch 2 weeks ago,and had the computer update done,everything was great till yesterday. The new clutch will not disengage ,so the engine roars and the shift pattern has changed due to the excess fan speed.No codes yet but we tested the clutch by disconnecting the connecter then brought the rpm's to about 2500 for a minute or two,and the fan still will not disengage. Got another gm oe clutch and the parts manager told me it has been a on going thing lately with the new revised clutches,the valve gets stuck in the clutch,it is a shot in the dark to get a good one. The original clutch never did this to me ,it just did not let the ac get cold when starting or sitting at a light...If this happens again I am just going to put the old one back on and wire in a e-fan as a pusher in the front of the rad and wire it into the ac compressor ,this way it only comes on when the ac is engaged...Gm should have done this in the first place..
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Old 07-02-2010, 02:04 PM
atblack21 atblack21 is offline
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It sounds like mine isnt ever disengaing either. I have ordered another brand to try it.
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  #10  
Old 07-02-2010, 02:39 PM
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GENAPRINCESS GENAPRINCESS is offline
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clutch fan

I was thinking about going to a after market clutch also,I am going to give one more chance to the o.e clutch by GM (BEHR) If this acts up I will go after market,if that screws up ,going to a e-fan wired to a/c compressor...
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