Hey all,
I have chosen to retain my stock A/C and was wondering how I need to wire up my second fan so that it turns on when the A/C is on. My stock computer used to control this.
I suppose I could have that second fan on a switch and whenever I turn on the A/C to make sure I flip that switch, but i'd rather it be all intregrated.
I tried searching but didn't find anything. Any ideas?
I have MSII
Factory Air Conditioning
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Factory Air Conditioning
1998 Dodge Avenger ES with 6g75 swap and a543 transmission--- Megasquirt II
2005 Dodge Ram SRT-10 Quad Cab- Magnaflow, Q-forms, Components, 7" indash DVD
2007 Honda CBR1000RR- Power Commander, Custom Acura TSX HID, K&N, Michelin Pilot Powers
2005 Dodge Ram SRT-10 Quad Cab- Magnaflow, Q-forms, Components, 7" indash DVD
2007 Honda CBR1000RR- Power Commander, Custom Acura TSX HID, K&N, Michelin Pilot Powers
-
kjones6039
- Master Squirter
- Posts: 618
- Joined: Sat Jul 22, 2006 7:02 pm
- Location: Eureka, Nevada USA
- Contact:
Re: Factory Air Conditioning
Just thinking out loud here..........
Why not use the signal that is sent to the compressor clutch already to turn on fan #2 when the compressor kicks on.
And save the MS output for something else?
Ken
Why not use the signal that is sent to the compressor clutch already to turn on fan #2 when the compressor kicks on.
And save the MS output for something else?
Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Factory Air Conditioning
I'd take a similar approach to KJones. Use a relay to turn on the fan whenever the A/C is on.
Re: Factory Air Conditioning
I thought about having the fan turn on when the A/C is on. The issue is I have no idea how to do that. Also, the factory computer told the fans to turn on when the pressure hit a certain level.
The A/C has 3 wires coming out of it. Two go to the fuse box and the other goes to the A/C switch on the dash. A friend told me that the two that go to the fuse box are a high and low pressure switch. I am not sure what that means but that still doesn't help me to understand how to wire the fan (which is a simple power and ground) and have it turn on when the A/C is on.
The A/C has 3 wires coming out of it. Two go to the fuse box and the other goes to the A/C switch on the dash. A friend told me that the two that go to the fuse box are a high and low pressure switch. I am not sure what that means but that still doesn't help me to understand how to wire the fan (which is a simple power and ground) and have it turn on when the A/C is on.
1998 Dodge Avenger ES with 6g75 swap and a543 transmission--- Megasquirt II
2005 Dodge Ram SRT-10 Quad Cab- Magnaflow, Q-forms, Components, 7" indash DVD
2007 Honda CBR1000RR- Power Commander, Custom Acura TSX HID, K&N, Michelin Pilot Powers
2005 Dodge Ram SRT-10 Quad Cab- Magnaflow, Q-forms, Components, 7" indash DVD
2007 Honda CBR1000RR- Power Commander, Custom Acura TSX HID, K&N, Michelin Pilot Powers
-
kjones6039
- Master Squirter
- Posts: 618
- Joined: Sat Jul 22, 2006 7:02 pm
- Location: Eureka, Nevada USA
- Contact:
Re: Factory Air Conditioning
If it was me, I would locate the wire that goes to the compressor clutch and attach the relay coil to that wire and ground. From there you could run 12 volts to the fan via the N/O relay contacts.
Ken
Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
Re: Factory Air Conditioning
The compressor tends to cycle. It would be better to simply have the fan run all the time the AC is switched on.kjones6039 wrote:If it was me, I would locate the wire that goes to the compressor clutch and attach the relay coil to that wire and ground. From there you could run 12 volts to the fan via the N/O relay contacts.
Ken
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
-
kjones6039
- Master Squirter
- Posts: 618
- Joined: Sat Jul 22, 2006 7:02 pm
- Location: Eureka, Nevada USA
- Contact:
Re: Factory Air Conditioning
Point well taken Dave! 
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
Re: Factory Air Conditioning
Of course if it is an upmarket car with multiplexed switching, it may not so simple. ;-)kjones6039 wrote:Point well taken Dave!
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Re: Factory Air Conditioning
It's a 1998 Dodge Avenger ES.
I suppose it's one of those things I really can't rest unless the engine is running huh.
I suppose it's one of those things I really can't rest unless the engine is running huh.
1998 Dodge Avenger ES with 6g75 swap and a543 transmission--- Megasquirt II
2005 Dodge Ram SRT-10 Quad Cab- Magnaflow, Q-forms, Components, 7" indash DVD
2007 Honda CBR1000RR- Power Commander, Custom Acura TSX HID, K&N, Michelin Pilot Powers
2005 Dodge Ram SRT-10 Quad Cab- Magnaflow, Q-forms, Components, 7" indash DVD
2007 Honda CBR1000RR- Power Commander, Custom Acura TSX HID, K&N, Michelin Pilot Powers
Re: Factory Air Conditioning
My 92 Dakota has a push button to turn on the A/C I just wired in a relay to light thats lit when the button is in to work my fan.
Just an idea
Just an idea