[Cableguy]

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?

 

[Cableguy]

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...

 

[unplugged]

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.

 

[ChevyFan]

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.

 

[ChevyFan]

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

 

[Cableguy]

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!

 

[ChevyFan]

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]

 

[Cableguy]

Holy moly! Now thats a TSB mouthful...thanks

 

[GaryL]

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.

 

[TrailLeadr]

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.

Just a hop, skip, and a jump away....:lol:

 

[Cableguy]

Thanks for the offer Gary.

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