AC problem = Tune problem?

SKRAPR · May 10th, 2009, 07:56 PM

Hey guys,

Just wondering. I had my cams installed this past week. Just drove the car home from the shop about 2 hours ago. (Guys were working on Mother's day . . . dedicated) Anyway, I noticed that my ac fan is blowing . . . but no cold air. On further inspection . . . the compressor does not appear to be running. I drove it back to the shop to talk to the guys. We looked at the fuse (was fine) . . . and the plug was in the compressor . . . everything appears to be as it should . . . aside from the fact that the ac does not work.

He said to bring it back tomorrow and they would look at it closer. So Question: Could the tuner have inadvertently turned the ac compressor off? I know can turn all kinds of different parameters off: traction control, O2 sensors, etc. What about the ac compressor? I hope that's all it is. I don't know what the ac would have to do with the cam install. It's making me a little nervous though.

SKRAPR · May 10th, 2009, 08:52 PM

Nobody?

I guess you guys must have as much tuning experience as me . . . exactly nada!!

Kind of a specialty topic . . . I know.

JakeM · May 10th, 2009, 08:56 PM

The only thing I can think of is the WOT lock out. When you go anything passed 80% throttle the factory ECU shuts down the compressor. So, if you tuner messed with that function that would be the only thing I could think of. If not, its most likely a Mechanical/Wiring issue.

SKRAPR · May 10th, 2009, 09:37 PM

Originally Posted by Towelly

The only thing I can think of is the WOT lock out. When you go anything passed 80% throttle the factory ECU shuts down the compressor. So, if you tuner messed with that function that would be the only thing I could think of. If not, its most likely a Mechanical/Wiring issue.

Good to know. I'll mention it tomorrow when I go back by the shop after work. Thanks.

Ace417 · May 10th, 2009, 10:24 PM

Originally Posted by Towelly

The only thing I can think of is the WOT lock out. When you go anything passed 80% throttle the factory ECU shuts down the compressor. So, if you tuner messed with that function that would be the only thing I could think of. If not, its most likely a Mechanical/Wiring issue.

is that to divert power from there back to the engine im guessing?

JakeM · May 10th, 2009, 10:27 PM

Originally Posted by Ace417

is that to divert power from there back to the engine im guessing?

Yes.. To lessen parasitic drain under high load...

Jucostud · May 10th, 2009, 11:38 PM

My ac isn't working either... come to think of it, it started right after my cam install. Let me know what happens!

Trick Tuners · May 11th, 2009, 11:36 AM

Its totally possible to do that in the tune. It could be due to a low TP for WOT setting, or a low AC disable setting.

SKRAPR · May 15th, 2009, 01:56 PM

Ok . . . so . . .

The compressor pressures are fine . . .
Power is making it to the relay in the fusebox . . .
We by-passed the relay just to see if the compressor worked, and it does . . .
We swapped another relay in to see if that was the problem, it was not . . .

We checked the WOT toggle for the AC . . . that was not it

However, we have all deduced that it has got to be something to do with the SCT-X3 or the car's computer - but it is still a mystery.

Black Car + Black Leather Interior + Charlotte, NC + Summer + No AC =

AAAAaaaahhhhhhhhhhh !!!!!!!!!!!

IronStomach · May 15th, 2009, 02:04 PM

Originally Posted by SKRAPR

t

However, we have all deduced that it has got to be something to do with the SCT-X3 or the car's computer - but it is still a mystery.

GEt ahold of SCT and ask them?

UrbanRedneck · May 15th, 2009, 11:44 PM

in your relay tests you forgot to mention if you checked that the pcm is grounding the relay to turn on the compressor, which I assume it isn't. How did you check the WOT toggle? I'd contact your tuner and ask them if they messed with the wot toggle setting like trick tuners said.

SKRAPR · May 16th, 2009, 12:29 AM

I've been talking to my tuner all week. Not sure about the ground? I'll have to look at that.

It's just strange that this happened at the same time as the cam install. The cams have nothing to do with the ac. The only common denominator is the SCT tuner or the pcm. God, I hope it's not the pcm. Just shoot me now.

It's got to be something with the tune or the X3 . . . that's the only thing that makes sense to me.

May 10th, 2009, 07:56 PM	#1
SKRAPR Regular 2005 Mustang GT Join Date: Oct 2007 Location: Charlotte, NC Posts: 277 iTrader: 0 reviews	AC problem = Tune problem? Hey guys, Just wondering. I had my cams installed this past week. Just drove the car home from the shop about 2 hours ago. (Guys were working on Mother's day . . . dedicated) Anyway, I noticed that my ac fan is blowing . . . but no cold air. On further inspection . . . the compressor does not appear to be running. I drove it back to the shop to talk to the guys. We looked at the fuse (was fine) . . . and the plug was in the compressor . . . everything appears to be as it should . . . aside from the fact that the ac does not work. He said to bring it back tomorrow and they would look at it closer. So Question: Could the tuner have inadvertently turned the ac compressor off? I know can turn all kinds of different parameters off: traction control, O2 sensors, etc. What about the ac compressor? I hope that's all it is. I don't know what the ac would have to do with the cam install. It's making me a little nervous though. __________________ Skrapr 2005 Mustang GT (5-spd Manual) FRPP 4.10's Kooks LT's \| Kooks Cat'd X C&L Racer CAI Dyno'd \| SCT-X3 MGW Shifter \| MGW Interior Details Comp XFI SPR Stage-II's

May 10th, 2009, 08:52 PM	#2
SKRAPR Regular 2005 Mustang GT Join Date: Oct 2007 Location: Charlotte, NC Posts: 277 iTrader: 0 reviews	Nobody? I guess you guys must have as much tuning experience as me . . . exactly nada!! Kind of a specialty topic . . . I know. __________________ Skrapr 2005 Mustang GT (5-spd Manual) FRPP 4.10's Kooks LT's \| Kooks Cat'd X C&L Racer CAI Dyno'd \| SCT-X3 MGW Shifter \| MGW Interior Details Comp XFI SPR Stage-II's

May 10th, 2009, 11:38 PM	#7
Jucostud booooost'd 2007 Mustang Join Date: Nov 2006 Location: drink'n ur kool-aid Posts: 7,043 iTrader: 0 reviews	My ac isn't working either... come to think of it, it started right after my cam install. Let me know what happens! __________________ Jucostud's Official Build Thread 1988 LX HATCH 5.0 - FOR SALE $5,000 OBO 2007 vortech gt - SOLD! Looking for next project

May 11th, 2009, 11:36 AM	#8
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	Its totally possible to do that in the tune. It could be due to a low TP for WOT setting, or a low AC disable setting. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

May 15th, 2009, 01:56 PM	#9
SKRAPR Regular 2005 Mustang GT Join Date: Oct 2007 Location: Charlotte, NC Posts: 277 iTrader: 0 reviews	Ok . . . so . . . The compressor pressures are fine . . . Power is making it to the relay in the fusebox . . . We by-passed the relay just to see if the compressor worked, and it does . . . We swapped another relay in to see if that was the problem, it was not . . . We checked the WOT toggle for the AC . . . that was not it However, we have all deduced that it has got to be something to do with the SCT-X3 or the car's computer - but it is still a mystery. Black Car + Black Leather Interior + Charlotte, NC + Summer + No AC = AAAAaaaahhhhhhhhhhh !!!!!!!!!!! __________________ Skrapr 2005 Mustang GT (5-spd Manual) FRPP 4.10's Kooks LT's \| Kooks Cat'd X C&L Racer CAI Dyno'd \| SCT-X3 MGW Shifter \| MGW Interior Details Comp XFI SPR Stage-II's

May 15th, 2009, 11:44 PM	#11
UrbanRedneck Hardcore Enthusiast 2008 Mustang GT 13.124@105.52 Join Date: May 2008 Location: Chicago Posts: 2,138 iTrader: 1 reviews	in your relay tests you forgot to mention if you checked that the pcm is grounding the relay to turn on the compressor, which I assume it isn't. How did you check the WOT toggle? I'd contact your tuner and ask them if they messed with the wot toggle setting like trick tuners said. __________________ Hurst Crew Member #20 2008 GT - ARH, C&L, Hurst, BORLA, BMR, Bilstein, FRPP, Axle Exchange. Awesome.

May 16th, 2009, 12:29 AM	#12
SKRAPR Regular 2005 Mustang GT Join Date: Oct 2007 Location: Charlotte, NC Posts: 277 iTrader: 0 reviews	I've been talking to my tuner all week. Not sure about the ground? I'll have to look at that. It's just strange that this happened at the same time as the cam install. The cams have nothing to do with the ac. The only common denominator is the SCT tuner or the pcm. God, I hope it's not the pcm. Just shoot me now. It's got to be something with the tune or the X3 . . . that's the only thing that makes sense to me. __________________ Skrapr 2005 Mustang GT (5-spd Manual) FRPP 4.10's Kooks LT's \| Kooks Cat'd X C&L Racer CAI Dyno'd \| SCT-X3 MGW Shifter \| MGW Interior Details Comp XFI SPR Stage-II's

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