A/C Compressor not turning on? - LotusTalk

Fastmerc · 09-14-2009, 09:40 AM

Hello all

I recently did some of the viper a/c mods to improve cabin air flow, but after doing it I realized the compressor doesnt seem to be cycling. I checked the flow door over the heater core and that seems to function. I checked both the C4 and F19 fuses and they appear to be intact. Its there anything else I need to check (relays, switches, etc) before I attempt to access the compressor itself? Im handy but havent worked on many cars so very simplified instructions are very helpful. Also while im asking the recirc switch doesnt light up anymore, even though I have taped off the front intakes I would still like everything to work...are any of the other switch buttons in the car interchangeable to this one so I can test that out?

Thanks,
Brett

Fastmerc · 09-17-2009, 05:43 PM

Well no one responded which is unusual for this board, but for those who read my post, I was just low on refrigerant. Filled it up and it came right to life.

I am still unsure what is wrong with the recirculation. I have removed the switch and tested it and it is functioning. My fan speeds all work correctly so it doesnt seem that it is the resistor pack, not that it is in the same circuit anyway. Could anyone possibly lead me in the proper direction on what to check next?

Thanks,
Brett

TheViper · 09-17-2009, 06:20 PM

Brett,
Sorry, I didn't see your post before. As you have taped over the front air intakes, the recirculation switch is redundant & does nothing, simply ignore it.
Michael

Quote:

Originally Posted by Fastmerc

Well no one responded which is unusual for this board, but for those who read my post, I was just low on refrigerant. Filled it up and it came right to life.

I am still unsure what is wrong with the recirculation. I have removed the switch and tested it and it is functioning. My fan speeds all work correctly so it doesnt seem that it is the resistor pack, not that it is in the same circuit anyway. Could anyone possibly lead me in the proper direction on what to check next?

Thanks,
Brett

Fastmerc · 09-17-2009, 06:32 PM

Viper,
Thanks...I know its obsolete but im one of those guys that likes everything to work also. I am unfortunelty getting ready to trade or sell the car so I want to get it right before I offer it to anyone. Any help is greatly appreciated.

Thanks again!

TheViper · 09-17-2009, 06:41 PM

If the indicator light is not working it can indicate a few of things;
1) The LED is inoperative
2) There is no signal from the Switch Pack Module, but then many other lights would not work either
3) Bad connection at SPM or switch
Michael

Quote:

Originally Posted by Fastmerc

Viper,
Thanks...I know its obsolete but im one of those guys that likes everything to work also. I am unfortunelty getting ready to trade or sell the car so I want to get it right before I offer it to anyone. Any help is greatly appreciated.

Thanks again!

Fastmerc · 09-17-2009, 07:23 PM

The button itself works as I hooked it up to the headlight circuit and it turned on the lights and the led lit up. The connecton at the switch seems to be ok. Where is the Switch pack module so I may check the connection there?

TheViper · 09-17-2009, 08:05 PM

Here it is, that big light colored box.

Quote:

Originally Posted by Fastmerc

The button itself works as I hooked it up to the headlight circuit and it turned on the lights and the led lit up. The connecton at the switch seems to be ok. Where is the Switch pack module so I may check the connection there?

Fastmerc · 09-18-2009, 09:17 AM

Well I removed my gauge cluster. I see a black box behind the cluster but my dash is significantly different than yours. I see two screws that might allow me access to this box. I am posting pictures to confirm this is the box I need to check. Also is it ok to remove the wires to the gauge cluster without messing up anything?

Fastmerc · 09-18-2009, 09:21 AM

here are the pics

TheViper · 09-18-2009, 09:42 AM

It is difficult to see your photos as they are so large, for future reference you need to re size them to 800 wide. The SPM in my photo only looks white because of the light, it is actually black. It has a large plug that covers the whole width.
I see no reason why you could not remove the instrument cluster connector, however I have never done it.

Fastmerc · 09-22-2009, 02:10 PM

I pulled the switch pack and the connectors are firmly seated. Could you direct me to the correct wires to check for the recirc circuit.

Thanks for your help and your patience.

TheViper · 09-22-2009, 02:11 PM

It is the solid blue wire that is the recirc. light. Turn on your side lights and see if you have 12V at that Blue wire terminal.
Michael

Fastmerc · 09-22-2009, 03:04 PM

If I am doing it correctly the reading is 5.7 volts. I tested at the spm end and the switch end of the blue wire got roughly the same reading at both ends.

TheViper · 09-22-2009, 03:16 PM

Seems like a SPM issue

There is a splice within the SPM that feeds the side lights, headlight indicator light, AC indicator light & instrument lights as well as the Recirc light. If all the others are ok, seems like a SPM issue to me.
Michael

Quote:

Originally Posted by Fastmerc

If I am doing it correctly the reading is 5.7 volts. I tested at the spm end and the switch end of the blue wire got roughly the same reading at both ends.

Fastmerc · 09-22-2009, 03:37 PM

Is there anything else to check...such as the item the switch controls...if that item is bad then it might not be sending the right signal back to the spm to switch the light on?

TheViper · 09-22-2009, 03:41 PM

Simply turning on the sidelight switch sends power to those items I mentioned. If you are only getting 5.7V I can only conclude it is a SPM issue. You tested the switch in another application and the light worked.
Michael

Fastmerc · 09-23-2009, 09:34 AM

I opened up the spm, Im not an electronics repair guy but the board looks fairly simple. Would it be safe to assume the switch relay is one of the
HG4117 units. I have a friend the works for a aerospace contractor and does alot of circuit board work, just wondering if that relay could be more easily replaced than trying to get another spm.

09-14-2009, 09:40 AM	#1 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	A/C Compressor not turning on? Hello all I recently did some of the viper a/c mods to improve cabin air flow, but after doing it I realized the compressor doesnt seem to be cycling. I checked the flow door over the heater core and that seems to function. I checked both the C4 and F19 fuses and they appear to be intact. Its there anything else I need to check (relays, switches, etc) before I attempt to access the compressor itself? Im handy but havent worked on many cars so very simplified instructions are very helpful. Also while im asking the recirc switch doesnt light up anymore, even though I have taped off the front intakes I would still like everything to work...are any of the other switch buttons in the car interchangeable to this one so I can test that out? Thanks, Brett

09-18-2009, 09:21 AM	#9 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	here are the pics Attached Images

09-18-2009, 09:42 AM	#10 (permalink)
TheViper Alarmed & Dangerous Join Date: Jul 2005 Location: Boca Raton FL Posts: 3,205	It is difficult to see your photos as they are so large, for future reference you need to re size them to 800 wide. The SPM in my photo only looks white because of the light, it is actually black. It has a large plug that covers the whole width. I see no reason why you could not remove the instrument cluster connector, however I have never done it. __________________ Cobra OEM - Alarm, Immobilizer, CDL Emergency Override with warranty Additional Emergency Touch Keys - see link above Brand New Cobra Alarm Remote with warranty Cobra Remote Key Fob Strap Cobra Window Closing Module - Add to your existing Cobra alarm 3 Piece Front Clam Protection Kit with Center Bumper Undertray Removal Tool INFORMATION Improved AC & Heating System Battery Choices & Information Remote Key Fob, Alarm & Immobilizer Programming Light Bulb Conversions 2005

09-22-2009, 02:11 PM	#12 (permalink)
TheViper Alarmed & Dangerous Join Date: Jul 2005 Location: Boca Raton FL Posts: 3,205	It is the solid blue wire that is the recirc. light. Turn on your side lights and see if you have 12V at that Blue wire terminal. Michael __________________ Cobra OEM - Alarm, Immobilizer, CDL Emergency Override with warranty Additional Emergency Touch Keys - see link above Brand New Cobra Alarm Remote with warranty Cobra Remote Key Fob Strap Cobra Window Closing Module - Add to your existing Cobra alarm 3 Piece Front Clam Protection Kit with Center Bumper Undertray Removal Tool INFORMATION Improved AC & Heating System Battery Choices & Information Remote Key Fob, Alarm & Immobilizer Programming Light Bulb Conversions 2005

09-22-2009, 03:41 PM	#16 (permalink)
TheViper Alarmed & Dangerous Join Date: Jul 2005 Location: Boca Raton FL Posts: 3,205	Simply turning on the sidelight switch sends power to those items I mentioned. If you are only getting 5.7V I can only conclude it is a SPM issue. You tested the switch in another application and the light worked. Michael __________________ Cobra OEM - Alarm, Immobilizer, CDL Emergency Override with warranty Additional Emergency Touch Keys - see link above Brand New Cobra Alarm Remote with warranty Cobra Remote Key Fob Strap Cobra Window Closing Module - Add to your existing Cobra alarm 3 Piece Front Clam Protection Kit with Center Bumper Undertray Removal Tool INFORMATION Improved AC & Heating System Battery Choices & Information Remote Key Fob, Alarm & Immobilizer Programming Light Bulb Conversions 2005

09-17-2009, 05:43 PM	#2 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	Well no one responded which is unusual for this board, but for those who read my post, I was just low on refrigerant. Filled it up and it came right to life. I am still unsure what is wrong with the recirculation. I have removed the switch and tested it and it is functioning. My fan speeds all work correctly so it doesnt seem that it is the resistor pack, not that it is in the same circuit anyway. Could anyone possibly lead me in the proper direction on what to check next? Thanks, Brett

09-17-2009, 06:32 PM	#4 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	Viper, Thanks...I know its obsolete but im one of those guys that likes everything to work also. I am unfortunelty getting ready to trade or sell the car so I want to get it right before I offer it to anyone. Any help is greatly appreciated. Thanks again!

09-17-2009, 07:23 PM	#6 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	The button itself works as I hooked it up to the headlight circuit and it turned on the lights and the led lit up. The connecton at the switch seems to be ok. Where is the Switch pack module so I may check the connection there?

09-18-2009, 09:17 AM	#8 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	Well I removed my gauge cluster. I see a black box behind the cluster but my dash is significantly different than yours. I see two screws that might allow me access to this box. I am posting pictures to confirm this is the box I need to check. Also is it ok to remove the wires to the gauge cluster without messing up anything?

09-22-2009, 02:10 PM	#11 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	I pulled the switch pack and the connectors are firmly seated. Could you direct me to the correct wires to check for the recirc circuit. Thanks for your help and your patience.

09-22-2009, 03:04 PM	#13 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	If I am doing it correctly the reading is 5.7 volts. I tested at the spm end and the switch end of the blue wire got roughly the same reading at both ends.

09-22-2009, 03:37 PM	#15 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	Is there anything else to check...such as the item the switch controls...if that item is bad then it might not be sending the right signal back to the spm to switch the light on?

09-23-2009, 09:34 AM	#17 (permalink)
Fastmerc Registered User Join Date: Aug 2007 Posts: 54	I opened up the spm, Im not an electronics repair guy but the board looks fairly simple. Would it be safe to assume the switch relay is one of the HG4117 units. I have a friend the works for a aerospace contractor and does alot of circuit board work, just wondering if that relay could be more easily replaced than trying to get another spm.

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