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  1. R

    03 Tahoe no crank

    With high mileage, the ignition switch tends to collect dirt in the internal lube grease, blocking the switch contacts from making a good connection. I have taken apart several bad ignition switches, and the contacts are usually quite dirty. Have you replaced the switch yet?
  2. R

    2005 Tahoe B0229 - both front AC vents hot, rear vents cold

    The code given by the O/P, John in Nashville, is not directly connected to the air temperature. The circulation actuator only controls the source of air coming out of the vents, as John said in his post. The temperature of the air is modulated or controlled by the “blend door actuators as...
  3. R

    2005 Tahoe B0229 - both front AC vents hot, rear vents cold

    The front HVAC control module (part of the display) has sole control over the front air temperature and fan speed. It has no effect on the rear unit. The code certainly points toward either the controller or the circulation actuator. It is possible that the error code indicates that the...
  4. R

    Broken exhaust manifold bolt

    The Ford V-10 exhaust manifold studs/nuts work well for replacing bolts. Something like 10 foot-pounds of torque on the studs, then the proper torque on the nuts. No possibility of spalling of the aluminum threads.
  5. R

    A couple of tips for using exhaust manifold clamps

    Hello Mark, Yes you are right that the torque applied to the nuts is the same as the torque applied to a head bolt. However, the nut is made of the same material as the stud. Steel is far better at resisting spalling, or friction caused crystallization of the thread material in the heads.When a...
  6. R

    2012 Yukon XL Denali temperature creeping up at idle only.

    Mr. Diver, I get the intended pun-I have glowed once when a new Christmas gifted shirt with plenty of fuzz ignited from aluminum wiring sparking in a dimly lit room. As an electrician, I was doing a volunteer project for a retired Army veteran when his wife told me that my shirt was emitting an...
  7. R

    2012 Yukon XL Denali temperature creeping up at idle only.

    Another thought: did the shop measure the actual fan rpm and compare to factory specs? Or did they measure the air volume (cubic feet per minute). I agree with above postings regarding motor, temp sensor and ECM issues. When you say that the engine is idling is this only when vehicle is...
  8. R

    A couple of tips for using exhaust manifold clamps

    When I pulled the heads to redo the roller lifters (loud squeal that was obviously a needle bearing or more no longer rotating), I bought 8 mm studs for a Ford V-10. The advantage? The studs are installed at much less torque, so are very unlikely to overstress either the male stud threads or the...
  9. R

    Weird electrical problems

    Bazillion volts (electronic term) of lightening can fry anything in our vehicles. Lightening has so much power that anything with metal, or carbon (tires, wire insulation, plastic, etc) can conduct some of the electricity that is present around the area of a strike. I have seen and repaired...
  10. R

    Rear HVAC randomly turns on after engine is off

    How old is your battery? Is the vehicle only driven sporadically during some of the year? Do you use a "smart" maintenance charger on the battery? The reason I ask, is that a battery that sits for long periods of time builds up sulfation in the cells. This can damage the battery and cause...
  11. R

    2007 Tahoe/Weird clunking when gas is pressed

    As mentioned above, the transfer case can also cause this noise. There is a large chain in the case that transfers power to the back and front differentials. That chain can wear and stretch, causing a clunking noise. This possibility does not rule out the motor mounts.
  12. R

    Tire pressure for bigger wheels

    Another option is to find a flat, open parking lot area. Draw chalk lines across the tread and drive straight ahead far enough to get a few tire rotations and observe the pattern of wear shown by the location of chalk removal.
  13. R

    Smelling coolant

    The kit with a small black light flashlight and fluorescent dye added to the coolant can make the search a little quicker.
  14. R

    Fan and fan clutch removal during the winter

    Compared to the other power suckers on the engine, and in the transmission the amount needed to drive the fan clutch when not actually needed is probably not noticeable in your fuel mileage. In fact, maybe the fan helps drag the car along the road when it rotates?
  15. R

    Cylinder Head replacement -- recommendations

    Summitracing.com has knowledgeable advisors and many choices--800-230-3030
  16. R

    06 tahoe small leak detected code

    It would make sense that a leak code for the vapor system would be a device that can allow pressure to be relieved in the system. The three devices that can do that are the two solenoids and the gas cap. Usually when the canister fails, the tubing either plugs up with loose charcoal bits or a...
  17. R

    07 yukon denali motor mounts go bad every year

    Pete, Your idea for checking the motor mounts does work. I have used it before. However, I do question how being in reverse will check the passenger side. The torque the motor feels doesn't change direction, no matter the gear selection. The motor and tranny input shaft/pump/torque converter is...
  18. R

    Anyone pull a dump trailer with their Tahoe/Yukon

    One thing to keep in mind is that the short wheelbase of an SUV can make it hard to control a trailer during an emergency avoiding/stopping maneuver. A ¾ ton pickup can be a safer tow vehicle because the suspension/weight/length combination can more easily resist the forces created by the load...
  19. R

    “Low oil pressure” I’m stuck...

    For an older engine, with higher clearances, increasing viscosity to a 10-30 oil is ok. Are you using 5-20 viscosity?
  20. R

    Loosing more and more MPG!!

    One more thought on AFM --Koenigsegg has produced engines for some of their high end cars that don't use a cam. they have computer controlled valves. A reduction in engine weight, increase in efficiency and power. They also designed a 4 cylinder engine for a major Chinese car manufacturer using...
  21. R

    Loosing more and more MPG!!

    Brandon, I didn't see in this thread anybody talking about AFM delete. It is a great mod, since it eliminates an expensive repair down the road. But, there is a cost in fuel economy, which can be 1-2 mpg, depending on city/hwy driving percentage. That AFM system will constantly switch between...
  22. R

    Please help identify what is behind this seam - water leak troubleshooting

    Sometimes leaks can be found by blowing high pressure, high volume air (shop vac or leaf blower) into the vehicle interior while using a soapy solution that can be spread around areas of possible leaks. Bubbles may show up at the location of water leakage. Hi volume air is needed because the...
  23. R

    Vehicle pulls left or right when braking

    I did not see a specific statement that you have replaced the brake caliper hoses. As you are probably aware, these can act as a check valve, decreasing the clearance between the rotor and caliper pads. The normal runout on the rotors "throws" the pads away from the rotor when the brake pedal is...
  24. R

    Need help with a coolant leak

    If you have rear heat, the most common leaks on older tahoes, yukons, etc are at the heater hose tee connections at the fire wall above the engine. O-rings are the way that the factory seals these connections. O-rings should not be considered a permanent connection as they shrink over time and...
  25. R

    Misfire on 3 and 7 2003 5.3 almost 300k

    Hutch, you mentioned early in this thread that you had pulsing interior lights and a code related to throttle position sensor. How old is your battery? Have you had it load checked? Have you had the alternator checked for a diode failure? Both of those things can cause many different symptoms...

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