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Discussion Starter · #1 ·
I tried my A/C first time ever today and no go. Come to think of it I didn't hear pump kicking on and off. (Unless there really quiet) What do ya think I'm in for?
 

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Discussion Starter · #2 ·
Well I tested it last nite. The fuses are good relay switch is good. Compressor is not coming on. I have a funny feeling there is no freon (or whatever is in it) and safety cut off switch is telling it not to come on. Anybody feeling the love...

Anybody good at A/C problems...
 

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Get a set of gauges

If you're the type that has to have the answers to the questions before you take it to your mechanic, then get your self a set of gauges. They run $40 - $100 and will let you know the high/low pressures. I just bought a set for $70 from AutoZone to recharge the mini-van's AC. For testing purposes you can bypass the pressure switch to get the compressor to kick in.
 

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I tried my A/C first time ever today and no go. Come to think of it I didn't hear pump kicking on and off. (Unless there really quiet) What do ya think I'm in for?
First time ever? I guess I remember those days growing up in the northwest where we didn't need AC in the car except for maybe like 5 days per year when it hit 85F.

I think I've heard of this issue before, let me look into it and see if I can come up with something.
 

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There appears to be some issues with the A/C Cycling Switch. That's a cheap part and it has been known to go out on the 2002 and 2003 models.
Trailblazer Parts
 

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Discussion Starter · #6 ·
Thanks Unplugged and Steve, The gauges would be a good idea for the tool box anyway. I should get more familiar with A/C systems anyway.
Steve are talking about the relay in fuse panel? I swapped it with wiper relay and its not that (There the same relay) I still kinda think lines are empty. Causing it not to come on but thanks, I've got an old friend of my Dads from GM going to take a look at it.

See just another reason to join GMTruckClub.com today! All the guests reading this post!
 

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http://acdelcotechconnect.com/pdf/tsb/tsb_03D-128.pdf

AC Delco put out a fact sheet on this issue with their switch:

[FONT=TimesNewRoman,Bold]BULLETIN: 03D-J-128[/FONT]
[FONT=TimesNewRoman,Bold]LINE: 15[/FONT]​

[FONT=Arial,BoldItalic]SERVICE BULLETIN[/FONT]
[FONT=TimesNewRoman,Bold]TO: ALL DISTRIBUTORS AND JOBBERS[/FONT]​

[FONT=TimesNewRoman,Bold]DATE: SEPTEMBER 26, 2003[/FONT]​

[FONT=TimesNewRoman,Bold]FROM: S. D. CHRISTOPHERSEN, PRODUCT SERVICE & TRAINING[/FONT]​

[FONT=TimesNewRoman,Bold]SUBJECT: AIR CONDITIONING (A/C) INOPERATIVE/INTERMITTENT, [/FONT][FONT=TimesNewRoman,Bold]A/C BLOWS WARM AIR (REPLACE A/C LOW PRESSURE [/FONT][FONT=TimesNewRoman,Bold]CYCLING SWITCH)[/FONT]​

[FONT=TimesNewRoman,Bold]DESCRIPTION:[/FONT]
Air Conditioning (A/C) Inoperative/Intermittent, A/C Blows Warm Air (Replace
A/C Low Pressure Cycling Switch)
2003 Cadillac Escalade, Escalade EXT, Escalade ESV
2002-2003 Chevrolet TrailBlazer, TrailBlazer EXT
2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2002-2003 GMC Envoy, Envoy XL
2003 GMC Sierra, Yukon, Yukon XL
2002-2003 Oldsmobile Bravada
2003 HUMMER H2

[FONT=TimesNewRoman,Bold]CONDITION:[/FONT]
Some customers may comment that the A/C system is intermittently inoperative or blows warm air.

[FONT=TimesNewRoman,Bold]CAUSE:[/FONT]
An intermittent inoperative (open) A/C low pressure cycling switch may be the cause. This is an intermittent condition, and temperatures may play a critical role if the vehicle is in the failed mode or operating as designed.

[FONT=TimesNewRoman,Bold]CORRECTION:[/FONT]
Follow the diagnosis and service procedure below to correct this condition:
1. Park the vehicle inside or in the shade.
2. Open the windows in order to ventilate the interior of the vehicle.
3. If the A/C system was operating, allow the A/C system to equalize.
4. Turn OFF the ignition.
5. Open the hood and install fender covers.
6. Install the J 43600 ACR 2000 Air Conditioning Service Center or equivalent equipment.



Important:

The ambient temperature must be at least 16°C (60°F).

Do not induce additional airflow across the front of the vehicle during the

test.


7. Record the ambient temperature displayed on the J 43600.


Record readings of the low and high side STATIC pressures. The pressures


should be within the specifications listed below.


Above 16°C (60°F): 345 kPa (50 psi)


Above 24°C (75°F): 483 kPa (70 psi)

Above 33°C (90°F): 690 kPa (100 psi)

If the static pressures are within specification, continue with Step 12.

If the static pressures are NOT within specifications, refer to Leak Testing

in the appropriate service information.


9. Apply the parking brake.


10. Place the transaxle/transmission in PARK.


11. Start the engine.


12. Turn on the A/C system.


13. Inspect the A/C compressor to see if it is operating properly.


1 – Accumulator


2 – Low Pressure Cycling Switch


14. If the compressor is not operating as designed, tap on the low pressure cycling


switch with a small hand tool. The compressor should start operating


correctly.


15. If the compressor does not operate correctly after tapping on the low pressure


cycling switch, disconnect the switch and jumper the lower pressure cycling


switch connector with a fused jumper. If the compressor still does not operate


properly, refer to HVAC Compressor Clutch Does Not Engage in the


appropriate service information.


Important: DO NOT USE A/C low-pressure cycling switch P/N 15-5715


(1132749) or P/N 15-5720 (15035084) on the vehicles listed above.


If the compressor does operate correctly after tapping on the switch or


jumping the low pressure cycling switch connector, replace the low pressure


cycling switch, P/N 89040362. Refer to Air Conditioning (A/C) Low



Pressure Switch Replacement in the appropriate service information.


17. Perform the Air Conditioning (A/C) System Performance Test in the


appropriate service information.


18. Disconnect the J 43600 ACR 2000 Air Conditioning Service Center or


equivalent equipment.


19. Remove the fender covers and close the hood.


[FONT=TimesNewRoman,Bold]PARTS INFORMATION:


[FONT=TimesNewRoman,Bold]Important


[FONT=TimesNewRoman,Bold]Part Number Description Qty


15-50156 (89040362) Switch, Pressure Cycling 1


Parts are currently available from ACDelco/GMSPO.
Chevy Parts
Chevy Truck Parts
Trailblazer Parts
[/FONT][/FONT][/FONT]
 

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Discussion Starter · #8 ·
Holy moly! Now thats a TSB mouthful...thanks
 

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If you want to bring it by this weekend, I'll check the pressures for ya. Just let me know when you think you'll be here so I can meet you out back.
 

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Discussion Starter · #11 ·
Thanks for the offer Gary.

BTW were you working with paint thinners today? :sarcastic:
 
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