Question about 2003 GMC Envoy

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I have a 2005 saab 9-7x 4.2l i have the code p0495 and its saying somthing with the fan speed. i dont have any fan noises or anything like that. how would i go about fixing this

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You have fuses and relays for the fan speed. It has a low and high speed each with thier own fuses and relays. I would start there. They are located under the hood in the fuse/ relay junction block.
Also the fans are controlled by the ecm computer and the engine coolant temperture sensor. Along with the air conditioning system. It is possible to have one of the fans short out and not make any noise. you can check the fans by spinning them, if one seems to drag it is going out. If you can move them in and out from the motor they are going bad. Let me know.
Randy

Posted on Nov 10, 2010

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1 Answer

P0495 & p0128


I am thinking you are on the right track. A noisy, wobbly fan has to be replaced and replacing the thermostat could reduce the fan speed as the problems are interrelated.

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2002 TRAILBLAZER SOUNDS LIKE A JET TAKING OFF.TROUBLE CODE PO495. WHAT DO I NEED TO FIX THIS.


This is your fan clutch, that's what P0495 is, your clutch is not working properly. Therefore, it sounds like a jet because the fan clutch is constantly engaged. Very common from 2002-2--2004 TB's. Need to borrow some specialty tools like fan clutch wrenches from say Autozone, some Autozone's charge a fee and refund it when you bring it back. Been there done this with my 03'.

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May 08, 2010 | 2002 Chevrolet Trailblazer Ext

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Code reader reads code as P0495, which is high speed fan, service engine soon light is on


Hello! P0495 indicates that the engine cooling fan is spinning faster than what is desired. The vehicle uses an electro-viscous fan clutch. It is similar in operation to the old style fanclutches, however, it can be controlled electroniclly by the Powertrain control module. It is common for the fan clutches to fail and stick "on". When the PCM sees that the fan clutch is stuck on, it will set this code. Another symptom often found when this occurs, is a very loud fan noise, similar to Semi and has even been described by some customers as sounding like a jet engine!

At any rate, GM came out with revised software calibrations that are supposed to "alleviate" some of these symptoms, but of all the software updates I have done, they usually don't fix the problem and the vehicle ends up getting a fan cluch anyway. Software calibrations must be done at the dealer and are not free, so you may just want to cut to the chase and replace the fan clutch. They run about $300-400 depending on where you purchase it from and can be a bear to replace!

On a side note, I have seen a few that had broken wires at the fan clutch connector (top driver side of radiator) and occasionally a rubbed wire behind the fan blade, so you will want to look at those closely before you sink a bunch of money into it

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P0440 - Evap system large leak. This code has a real common problem of the fuel fill cap either loose or the seal or check valve bad in the cap. There are also some hose and lines from the fuel tank to the charcoal canister that can be the problem. But most common is fuel cap loose or bad.

P0495 - Cooling fan rpm too high. This code sets when the control module has commanded the cooling fan rpm to zero and the rpm exceeds a predetermined amount. Your vehicle has a clutch driven cooling fan that the control module regulates through a solenoid valve. Most common problem is a stuck fan clutch which is consistant with the "jet plane" noise you are hearing. The clutch staying engaged when it should be slipping or "idling"
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1 Answer

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I had the same noise on my 2000 Viggen. Its a $150 part its the interior fan. Dealer has them in stock it has to do with your climate control.

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