Question about 2003 GMC Yukon XL

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Major freon leak, knock sensor codes, reduced engine power

I had dye ran through my system and no obvious leaks found. After charging, there was a distinct smell inside the vehicle. Freon lasted less than hrs. Also the computer ran codes that indicated the knock sensors need to be replaced. My reduced engine power kicks on now almost every time I try to drive it oppose to every couple months. I also seem to be losing gas mileage. One owner,myself; 260,000 miles. Until I can further indicate problems, Its parked!!!

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I would say your a/c evaporator may be the culprit for your leak. What code did it give you for the knock sensor replacement? I would give it a tune up if it has been awhile.

Posted on Apr 23, 2013

Testimonial: "Not sure what the codes are specifically. I had the shop run it on the computer. Tune up is current. Could the knock sensor code cause the reduce engine power? Also in a Yukon to get to the evaporator, does that intel pulling the seats and console? Whats the estimated cost in regards to the evaporator work?"

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Posted on Jan 02, 2017

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SOURCE: 2004 GMC Yukon won't start/shift ind. on dash won't illuminate

yes! its possible bad connection or the neutral safety switch is bad.hope this helps !!

Posted on Mar 28, 2009

emissionwiz
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SOURCE: 2006 Envoy fuel sensor failure

the sending unit for the gas gauge is in the fuel tank and part of the fule pump module, it is not sold seperately. price around $350.00, 2 hours labor to install the part. see photo
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Posted on Apr 15, 2009

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SOURCE: A/C blowing hot air and can't find leak....

Its probably inside the dash, either in the coil or the connections

Posted on May 06, 2009

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SOURCE: truck won't start and died while driving

Likely the O2 sensor is seeing an overly rich fuel mixture and since it's beyond its range it is throwing a code. I don't remember ever seeing an O2 sensor shut off the engine. I'd look over the fuel pressure regulator temp sender and throttle position sensor. Possible one of those is sending mis-information and causing rich condition. There are other items that can do this as well but only go there if you strike out with what I suggested.

Posted on Jun 19, 2009

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SOURCE: 2004 GMC Envoy check engine light remains

Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.

Posted on Jan 20, 2010

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2 Answers

Freon leaking from somewhere... ran dye through the system saw nothing...what do u think?


found leak dye by evaporator coils. so ordered evaporator and replaced it.

Aug 12, 2015 | Cars & Trucks

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My Toyota Camry 2007 A/C wont work the freon is


To check for leak in evaporator,charge the system fully,with green neon dye,and use the glasses made for that.Let the ac run a good bit ,and condensation is leaking from the evaporator case,and look for the dye in the condensation.

Oct 05, 2013 | 2007 Toyota Camry

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Major freon leak, knock sensor codes present, reduced engine power more frequently occuring


i do not know what was done so i would check the oil for a milky color, if yes it has a bad head or head gasket, if no then pressure test the system and confirm it is leaking out then check the entire radiator and all the lines and hoses make sure the hose connections are not leaking at the radiator and drain, the overflow bottle could be cracked or leaking where the drain hose fitting is. One would think if it is leaking that bad it would be visible some where. check the radiator core for pinholes. if ithas tailoring check the coolers and lines for leaks and the cooler for pinholes.

May 04, 2017 | 2003 GMC Yukon XL

1 Answer

Ac problem loosin gas


Hi there:
What can happen is the vehicles Freon will leak out and reduce the total pressure in the system. Then the low-pressure cut out switch will disengage the compressor when the low side is detected below 25 psi.

This safety feature is to protect the compressor itself. I have seen mechanics bypass the low cut out switch for testing. This should never be done and is not recommended.

The visual presence of oil around a fitting or pressurized line is a strong indication of a refrigerant leak. So my first step in air-conditioning leak diagnosis is to perform a very careful visual inspection of the entire system.

Although this is always my first step for diagnosing Freon leaks it is not always effective in finding the exact problem. In fact, this visual inspection will only uncover large to extremely large leaks. A more common air-conditioning problem would be small leaks that allow Freon to escape over long periods of time. So to follow will be some methods to detect these small leaks.
- The Robinair leak detector is a hand held battery operated electronic leak sniffer. The test probe on the end of the leak detector is moved about 1 inch per second in the areas of suspected leaks. The Robin air leak detector has an alarm that will go off when it detects the presence of a Freon leak. Note on some other models they may have flashing lights or a buzzer. Also some leak detectors are specialized to detect only certain freons (example: 134a) but they all are designed to alert you when they sniff the refrigerant.
- To find refrigerant leaks using the fluorescent tracer system, you first have to install the fluorescent dye into the cars air-conditioning system. Always follow the instructions and do not install too much dye! Too much can reduce the cooling efficiency of the system. Different refrigerant dye leak detectors will accomplish this in different ways. The system we use at work has a device that looks like a caulking gun, and a hose that connects to the low side fitting. Then you actually push the dye into the low side with the engine running and the compressor engaged. Next you run the air-conditioning system for several minutes to distribute the dye evenly. Then you put on your yellow glasses and examine the system with a fluorescent light.
The fluorescent dye shows up easily wearing the yellow glasses.

A very popular selling item is Refrigerant with leak sealer. This item will only seal very small leaks. I have used the stuff pictured to the right "super seal pro" and it does work in some situations.

The Freon leak sealer works best when you have low side system leaks. And if you happen to have a small leak from an O-ring on the low side this stuff works well. If you have a leak on the high-pressure side chances are this sealer will not work for you.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Feb 15, 2012 | Cars & Trucks

1 Answer

My air conditioner works but does not cool . i have added freon the last two years and fixed the problem ,did the same thing this year but did not help .


When self adding freon after it leaks out you get air trapped in the system. After adding freon a couple of times the air expands not leaving room for the needed freon. To continue adding freon with air tapped will knock the compressor out pretty quickly, there's not enough room for both & the air is keeping the freon from being able to cool properly give the false indication of being low on freon. The freon you are adding has the dye added to assist in finding the leak since freon does not evaporate nor dissipate it its being leaked out. A black light will assist locating the leak. The best thing is to have the unit checked & serviced by a mechanic...he'll charge about $ 150.00 to check for leaks, remove the old freon...his machine will tell him how much air its trapped in the system by how little freon is removed. For the service fee he will replace valves & gaskets, where needed, correcting most leaks. After sucking the system down & recharging the problem should be corrected.

Jul 19, 2011 | 2001 Dodge Ram 2500 Truck

1 Answer

Low freon and abs and traction control light come on


When the low freon light comes on it means that there is little or no freon in the a/c system.The hvac module will not let the compressor engage to protect the system.You will need to partially charge the system and add dye to find out where it is leaking.If no external leaks are found then it is usually the evaporator core.This is located in the dash and is a big job.
As far as the ABS light you need to get the codes from the ABS module to find out what wheel or wiring could be causing the problem.When the ABS light is on the traction control light will come on automatically.Once you get the codes post back and I`ll be glad to help you out or let me know what the shop found.Good luck.

Aug 19, 2010 | 1997 Cadillac DeVille

2 Answers

The freeon want stay in


There's a leak in your ac system. Have a shop trace the leak. They would pump in a dye to locate the leak. It usually leaks in the compression seal

Aug 11, 2010 | 2000 Jaguar S-Type

2 Answers

When i turn on ac it blows hot air


Normally due to low freon. Also, notice if the a/c compressor clutch engages, as it will not if the freon is low.

Jun 05, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Engine cuts out and shudders at 3000 rpm won't accelerateobd code p0332 2002 jaguar x type 3.0 l


P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)

This sensor signals the engine-control computer when detonation is detected, momentarily retarding ignition timing until detonation ceases.

Most computer-controlled systems use knock sensors to ****** timing when the engine is experiencing pinging or knocking.


Obviously, a faulty knock sensor produces problems that appear to be ignition-system-related. If the knock sensor system does not provide an engine detonation signal to the PCM (powertrain control module), the engine detonates, especially on acceleration.
  • The first step in diagnosing the knock sensor and knock sensor module is to check all the wires and connections in the system for loose connections, corroded terminals, and damage.
  • With the ignition switch on, be sure that 12 volts are being supplied through the fuse to the knock sensor module.
  • A quick check of a knock sensor is to watch the ignition's timing while the engine is running and the engine block is tapped with a hammer.
    • The noise should cause a change in timing.
  • The knock sensor can also be checked by tapping near the sensor and watching for an AC pulse on a DMM or lab scope.
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May 01, 2009 | 2002 Jaguar X-Type

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