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  1. R

    Reliability of '06 Yukon b/t 105-130k miles?

    GM 1/2 ton vehicles have a well deserved reputation for durable engine/transmissions (until the AFM cylinder shutdown engines appeared in 2007). Unfortunately it is not uncommon for some of the cheaper parts to fail (like sensors, axle seals, ball joints, suspension parts) and require repairing...
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    Overheating with Rear AC ON

    You could have a faulty (even though it is new) fan clutch. Buy or borrow an infrared temperature scanner to check your true water temp. I suppose you have checked the belt tension to ensure that the belt is not slipping.
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    Best spark plugs for a stock 05 yukon 5.3

    Sometimes the fancy plugs can cause engines to run very poorly. The factory engineers did not use them to design these engines!
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    2004 Tahoe Radiator

    If you install a true-cool or other oil to air cooler, in the winter the tranny oil can end up being pretty cold. The oil to water cooler in the radiator is actually more efficient at cooling the transmission when needed. More importantly the engine coolant at 195 to 230 degrees can keep the...
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    Suggestions/recommendations/experience with remanufactured cylinder heads to replace cracke Castec

    Does the seller have a good reputation or do you know them? Sometimes a great price means there is a problem. Is there a warranty if you find excessive bearing wear from high miles, poor maintenance or crazy driving? Some folks do not believe in wasting money on oil changes. At least pull a...
  6. R

    02 Tahoe trans issues

    If the torque convertor fails in that way, metal particles are already throughout the case. You will need a new or rebuilt tranny.
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    HARD 1-2 SHIFT

    The question us buyers of used vehicles have at a time like this is: How did the previous owners/drivers treat the vehicle. The transmission can absorb lots of stress, but aluminum and steel do have their limits.
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    Recalibrating HVAC

    This is obvious but, sometimes folks who are not familiar with auto electrics read these postings...do not use any wire or metallic object to bridge between the positive and negative terminals of the battery or battery cables when they are connected to the battery. Bad bad things will happen...
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    how hard to install older 5.3 in 07 Tahoe...

    If you search on the internet, there are many sources for new, used, or rebuilt GM V-8 engines. Many of the companies have been doing it for years. It is often cheaper to send your old engine in as a core, they send you back a good one. Assembly line rebuilding at a quality oriented facility can...
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    Help!!! collapsed lifters???

    These engines (GM calls this Automated Fuel Management) have two types of valve lifters: 8 normal, 8 shutdown type. The cylinder shutdown lifters are prone to failure and can damage the camshaft when one or more of them fail. Partial disassembly of the engine is most often necessary to assess...
  11. R

    weird random crank/no fire issue

    A couple of parts to suspect: Ignition switch has multiple contacts. If the contact that sends power to the ignition system fails, then no fire to plugs. A second suspect part is the cam position sensor. If it fails, no spark to plugs. It is not possible for all the coil packs to fail at the...
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    help with potential pass lock issue?

    The battery does not have to appear weak to cause problems. A battery or alternator can have internal problems which can cause strange symptoms. I suppose as a last resort, you could try changing out the battery if nothing else works. In your other thread you mentioned a problem with...
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    Gas tank size? I think my gauge is lying to me

    It is not wise to run the tank empty. The fuel pump for most gasoline vehicles including Tahoes can overheat if there is no fuel left in the tank. The fuel surrounds the pump and absorbs the heat.
  14. R

    Both washer fluid buttons for fluid

    I believe you have a loose connection in the pump switch circuits. The two switches probably share some common connections from the body control module. So when both switches are pressed then the pumps work. Without a wiring diagram, hard to fix.
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    Overheating with Rear AC ON

    Wow, you have a difficult problem. Is it possible that the gauge temperature sending unit is bad? Sending units frequently fail on high mileage vehicles and then the gauge shows the engine is either too hot or too cold. Have you checked the actual temperature of the coolant with an infrared...
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    Noise when starting, similar to older cars when you try to turn them on when they are already on.

    The ignition switch is certainly a logical cause of an engine not starting/running. Sometimes replacing parts that are not real expensive is a way of crossing a possible cause off your list. I would change the switch.
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    No-start, no-crank was intermittent now will never start

    The indication of being in the wrong gear means that the TCM transmission control module thinks you are not in park/neutral. This means that when you reconnected the battery, the TCM got confused for some reason. Until you can repair or replace the TCM, you will not be able to start the engine...
  18. R

    help with potential pass lock issue?

    A failing battery can cause weird electrical symptoms that are not logical. I have had an equinox and a duramax equipped pickup both have strange electrical problems. Changing out the batteries fixed them both. I think that loose internal battery connections can create electrical "noise" or...
  19. R

    weird random crank/no fire issue

    After reading twice, it seems that any of your relays in the ignition relay location will fail to fire intermittently. For this reason, I don't think it is a relay problem. Relays are a lot like guys--very simple. Either they work, or they don't. Without a wiring diagram I will guess that it...
  20. R

    05 Denali - Service Stability after disconnecting steering shaft

    Assuming that the front wheels are not moved during front end work, tying off the steering wheel to the passenger door, etc. would probably be the simple solution to prevent this issue.
  21. R

    Cooling fan will not turn off

    Sensor voltages are very low, usually 5 volts supply, less than that for the reference or analog return to the PCM. This can easily be affected by any corrosion around electrical connectors. Vehicles that live in a winter snow or seaside area can have salt residue under the hood. That salt...
  22. R

    Greasing the front wheel hubs.. (With pics)

    Ford super duty owners have been doing this for years on their front "unserviceable" hubs using lithium grease. Multiple write-ups on the various sites. The trick is not pumping so much in that it blows past the seal and gets all over the brake rotors. One advantage of using the ABS port is that...
  23. R

    Need 4 lifters

    AFM type engines both GM, Honda etc are having problems with the cylinder shutdown technology forced on them by federal government. The money saved in fuel savings will be spent to replace these parts or rebuild engines. The best safeguard is to spend the money to buy a tuner that will bypass...
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    Whine coming from engine?

    Auto parts stores etc. have automotive stethoscopes that are very handy for finding out if the whine is related to your alternator bearing (first choice), idler bearing, water pump, tensioner. Believe it or not, once in a while a belt with structural problems will cause a whine, sometimes even...
  25. R

    A/C compressor failure - 2015 Yukon XL

    One type of failure that would match yours is the a/c clutch coil starts overheating which takes out the front bearing. Then the front seal goes bad and the freon leaks out. Or the front bearing just goes out from poor quality and then takes out the front compressor seal. Good by freon. Rest of...

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