I have a strange tinging noise from the engine of a 2003 GMC Envoy. It sounds like someone tapping on metal with a small hammer approximately with crankshaft revolution. It runs fine but the noise puzzles me. Doesn't always happen but you'll notice it at idle. At idle it's about 2 per second.
Tinging Noise in 2003 Envoy...
- Thread starter arcondoc
- Start date
Molson02536
New member
Normally this is just a problem with the fan clutch. These have been a big problem for gm. The good news is that the new one from gm is redesigned and you should also have your local gm dealer check your vehicle as there is an updated calibration for the engine control computer to help fix this problem. As far as diagnosing this problem, I would first recommend first having this vehicle scanned with a scan tool to determine if there are any DTC codes in the ecm's history related to the fan clutch. This can give you important info on the exact failure on your vehicle. This requires a scan tool. If you do not have one, I would recommend checking with your local auto part stores to see if they do FREE engine diagnostic scans. if you can get this done, I can assure you of the exact problem on your vehicle. Feel free to contact me with any questions! Good luck.
Service Bulletin# 05-06-004. Unplug cooling fan clutch ( motor off ), start motor, check for clicking. If clicking goes away, it's the fan clutch. Fix is to take to GMC or Chevy dealer to have updated code programmed into PCM. When failing, the clicks are about 1-2 second apart, and do not change with engine speed.
Tinging noise stopped
Thanks for the advice...had the PCM reprogrammed and the tinging noise stopped. They also said the fan clutch (fan) was a bit wobbly and probably needed to be replaced. Price for this was pretty hefty. Is it a big job or something I can do without a great deal of difficulty?
Thanks for the advice...had the PCM reprogrammed and the tinging noise stopped. They also said the fan clutch (fan) was a bit wobbly and probably needed to be replaced. Price for this was pretty hefty. Is it a big job or something I can do without a great deal of difficulty?
Molson02536
New member
Warning:The engine must be completely cool when this procedure is performed .
Note: A special fan clutch wrench is required (GM#46406 or Equivalent)
Parts:
1. Fan Clutch (#25790869) - I picked mine up at Auto Value for $420 (CDN). You can get them cheaper on eBay or other sites. But I didn't have time to wait for it to ship.
2. Fan Clutch Removal Tool - a universal removal tool for $110 (CDN) from Auto Value.
Removal/Install:
1. Let the engine cool down completely! The coolant is hot, and if your reaching around by the water pump you will probably end up burning your arms on the engine.
2. Remove the two bolts connecting the fan shroud to the rad.
3. Disconnect the upper radiator hose on the left side of the rad. (You can either drain about 1 Qt of coolant from the rad, or just disconnect the hose and spill it everywhere )
4. Disconnect the fan clutch electrical connector on the top right side of the rad.
5. Use the fan clutch removal tool to disconnect the fan clutch from the water pump. If you are having a hard time getting the tool to stay on the water pump, try loosening two of the bolts on the water pump and putting the tool behind the bolts for some extra support. The nut comes off in a counter-clockwise direction (when facing the engine). There is a good chance that it will be tight as hell and if you have a friend around grab an extra hand, it makes things a lot easier.
6. Now remove the shroud, fan and clutch all at once. This can be a little tricky as there are two transmission lines clipped to the left front side of the shroud which make it difficult to lean the shroud forward to get it over the hose connector.
There are two ways to do this, you can remove the transmission lines from the bottom of the rad, or you can position the lines underneath the clips on the shroud, and wiggle it around until you get it over the hose connector. I would recommend not removing the transmission lines if you can!
If you choose to remove the transmission lines, remember, they are quick-connect fittings. On my truck the quick connect fittings would not come apart and I was forced to unscrew the fittings from the rad, which resulted in stripping the female ends (inside the rad), forcing me to also have to buy a new rad.
If you can, position the fan clutch nut on the top side of the water pump so it does not get stuck when you are trying to get the shroud/fan/clutch out as one piece.
7. Once you have the fan and clutch out, remove the fan from the clutch and install the new clutch. The 4 bolts connecting the fan to the clutch should be torqued to 20 ft.lbs.
Install is the reverse of removal. I read somewhere the fan nut is suppose to be torqued to the water pump at 40 ft.lbs. However I am not sure if that is correct or not.
Also be sure not to forget the electrical connector, lol.
Dealers still charging $700 for that clutch job based on old labor rates and parts price, when part has gone down in price about half what it was and it takes them less than an hour to actually do the job.
Here is a link I put out earlier in the month about converting the Clutch fan to a electric fan from and LS1 or a C6. You can pick up the electric fans from a Salvage Yard and you can buy the wire harness kit from the vendor on the link. Good luck and hope this helps.
http://ss-shootout.com/ls1-fans/ls1-fans.html
http://ss-shootout.com/catchcan.html
http://ss-shootout.com/index.html
Molson02536
New member
You could always do the Salvage yard and pick up the upgrade fan clutch for the Envoy. I believe the upgraded ones are the late 2005 and newer, the new design EV fan clutch has been installed on production vehicles from the end of 2005 model year production (June 2005) and all 2006 model year vehicles. The new design EV fan clutch may also be present on vehicles serviced with this new part per Corporate Bulletin Number 04-01-38-019A or for other service related conditions. The updated design of the electro- viscous (EV) fan clutch helps improve A/C performance but may also produce some additional fan engagement noise.
Do NOT replace an EV fan unless a specific condition related to the EV fan is identified using SI diagnostics. If the fan has a condition that warrants replacement, a DTC should set and/or SI diagnostics should lead to the replacement of the fan clutch.
Operating Characteristics of the Electro-Viscous (EV) Fan Clutch
Changes to the EV fan clutch to improve the HVAC performance basically increase airflow in certain conditions. It is now possible during start up for the EV fan clutch to be engaged and match engine speed for about 1 minute depending on driving speeds (with lower speeds having a longer disengagement time) producing some noise/flare. The noise/flare will most likely be intermittent and can be dependent on the following conditions:
• Fan clutch valve orientation, with check ball at 11:00 position as viewed from front of vehicle when the engine is stopped.
• HVAC or powertrain cooling conditions when the vehicle is shut off.
• Parking incline - vehicles parked nose up on a 16% or higher incline (such as vehicles coming off transport or parked on steep driveways) may have prolonged fan noise/flare until the fluid is pumped out of the working chamber of the fan. These conditions can occur in as little as ten minutes. Once the vehicle is not parked in these conditions, it should operate as expected.
• Please note that if the vehicle is parked nose down with a 16% or more decline, the EV fan clutch may have a delayed engagement response.
Important: Do not replace EV fan clutches for these conditions listed above; they are expected vehicle characteristics. If the fan clutch is truly operating at a speed higher than intended, a DTC P0495 or P1484 should set. Additional codes are available for other conditions
Diagnostic Tips
Depending on the vehicle year, the Tech-2 may allow some EV fan control using the special functions application of the Tech 2 (refer to the proper SI documentation). If this function or a fused jumper wire is being used to check EV fan response, there may be a delay in fan response (up to 2-3 minutes depending on conditions, please refer to SI diagnostics).
The desired fan speed and actual fan speed data (on the Tech-2) can be misleading. The desired fan speed is comprised of the maximum of multiple parameters (for example engine coolant temp, A/C pressure, etc.) and may not be the ruling desired fan speed parameter. The end result may be that the actual desired fan speed is lower than what is displayed. Additionally, the desired fan speed may be higher than the current engine speed. The fan is limited by the current engine RPM and will max out at about 3500 RPM under full manual fan engagement request along with a corresponding engine RPM speed. The 4.2L I-6 (LL8) engine's desired and actual fan speeds will usually be closer to each other than the 5.3L V-8 (LM4 or LH6) or the 6.0L V-8 (LS2).
Listed below are the cars and trucks the fan clutch is used in so your not limited to finding one for your Envoy if you do go to the Salvage Yard. Call around $25.00 to $50.00 at the Salvage yard since they have many of these go through there yard and will have 90 day warranty, but i am sure you can talk them to 2 fan clutch for $50.00 as long as you pull them off your self.
OE #: 15293048, 15192192, 15116115, 10383029, 25790869
The clutch is the latest revision, part number 25790869.
See below for a listing of all applications of the clutch:
Year Make Model Engine Application Note
# 2006 SAAB 9-7X: 5.3I V8 - 5.3L (325 CID): GAS: FI: N Electric
# 2006 SAAB 9-7X: 4.2I L6 - 4.2L (256 CID): GAS: FI: N Electric
# 2006 ISUZU ASCENDER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 ISUZU ASCENDER: LS V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 ISUZU ASCENDER: LS L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 GMC S15 ENVOY: XL SLT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 GMCS15 ENVOY: XL SLE L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 GMC S15 ENVOY: XL DEN V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 GMC S15 ENVOY: SLT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 GMC S15 ENVOY: SLE L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 GMC S15 ENVOY: DENALI V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 CHEVROLETS10 TRAILBLAZER: SSV8 - 6.0L (364 CID): GAS: FI: N: H Electric
# 2006 CHEVROLETS10 TRAILBLAZER: LT V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 CHEVROLETS10 TRAILBLAZER: LT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 CHEVROLETS10 TRAILBLAZER: LS V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 CHEVROLET S10 TRAILBLAZER: LS L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 CHEVROLET S10 TRAILBL.: EXT LTV8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 CHEVROLETS10 TRAILBL: EXT LT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 CHEVROLETS10 TRAILBL.: EXT LS V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 CHEVROLET S10 TRAILBL.: EXT LS L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2006 BUICK RAINIER: CXL V8 - 5.3L (325 CID): GAS: FI: N: M Electric
# 2006 BUICK RAINIER: CXL L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 ISUZU ASCENDER: S V8 - 5.3L (323 CID): GAS: FI: N: M Electric
# 2005 ISUZU ASCENDER: S L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 ISUZU ASCENDER: LS V8 - 5.3L (323 CID): GAS: FI: N: M Electric
# 2005 ISUZU ASCENDER: LS L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 ISUZU ASCENDER: LIMITED V8 - 5.3L (323 CID): GAS: FI: N: M Electric
# 2005 GMC S15 ENVOY: XUV SLT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 GMC S15 ENVOY: XUV SLE L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 GMC S15 ENVOY: XL SLT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 GMC S15 ENVOY: XL SLE L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 GMC S15 ENVOY: SLT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 GMC S15 ENVOY: SLE L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 CHEVROLET S10 TRAILBLAZER: LTL6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 CHEVROLET S10 TRAILBLAZER: LS L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 CHEVROLET S10 TRAILBL.: EXT LT V8 - 5.3L (323 CID): GAS: FI: N: M Electric
# 2005 CHEVROLET S10 TRAILBL.: EXT LT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 CHEVROLET S10 TRAILBL.: EXT LS V8 - 5.3L (323 CID): GAS: FI: N: M Electric
# 2005 CHEVROLET S10 TRAILBL.: EXT LS L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2005 BUICK RAINIER V8 - 5.3L (323 CID): GAS: FI: N: M Electric
# 2005 BUICK RAINIER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 OLDSMOBILE BRAVADA L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 ISUZU ASCENDER V8 - 5.3L (323 CID): GAS: FI: N: P Electric
# 2004 ISUZU ASCENDER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 GMC TRUCK S15 ENVOY L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 GMC TRUCK S15 ENVOY: XUV V8 - 5.3L (323 CID): GAS: FI: N: P Electric
# 2004 GMC TRUCK S15 ENVOY: XUV L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 GMC TRUCK S15 ENVOY: XL V8 - 5.3L (323 CID): GAS: FI: N: P Electric
# 2004 GMC TRUCK S15 ENVOY: XL L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 CHEVROLET S10 TRAILBLAZER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 CHEVROLET S10 TRAILBL.: EXT V8 - 5.3L (325 CID): GAS: FI: N: P Electric
# 2004 CHEVROLET S10 TRAILBL.: EXT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2004 BUICK RAINIER V8 - 5.3L (323 CID): GAS: FI: N: P Electric
# 2004 BUICK RAINIER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2003 OLDSMOBILE BRAVADA L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2003 ISUZU ASCENDER V8 - 5.3L (323 CID): GAS: FI: N: P Electric
# 2003 ISUZU ASCENDER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2003 GMC TRUCK S15 ENVOY L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2003 GMC TRUCK S15 ENVOY: XL V8 - 5.3L (323 CID): GAS: FI: N: P Electric
# 2003 GMC TRUCK S15 ENVOY: XL L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2003 CHEVROLET S10 TRAILBLAZER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2003 CHEVROLET S10 TRAILBL.: EXT V8 - 5.3L (325 CID): GAS: FI: N: P Electric
# 2003 CHEVROLET S10 TRAILBL.: EXT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2002 OLDSMOBILE BRAVADA L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2002 GMC TRUCK S15 ENVOY L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2002 GMC TRUCK S15 ENVOY: XL L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2002 CHEVROLET S10 TRAILBLAZER L6 - 4.2L (256 CID): GAS: FI: N: S Electric
# 2002 CHEVROLET S10 TRAILBL.: EXT L6 - 4.2L (256 CID): GAS: FI: N: S Electric
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