A/C Help.

JDs00GT · 09-25-2006, 01:10 PM

AC on the wifes 98 3.8 went out. the compressor has been replaced, but still no worky. When i jump the low pressure switch back by the firewall, the fan kicks on, but still no compressor clutch engagement, same thing when i jump the connector on the actual compressor. Anyone have any ideas? No leaks or anything, coolant levels are right where they're supposed to be. All fuses are good.

2k4mk1 · 09-25-2006, 01:14 PM

Sounds like the compressor clutch is bad. If it doesnt engage when energized yopu need to replace the clutch. Nothing more than an electro magnet.

JDs00GT · 09-25-2006, 02:09 PM

what are the odds though of the clutch being bad on two different compressors

**bighoss88lx** · 09-25-2006, 02:17 PM

This is a reply I typed up on another AC thread...Im lazy.

Go by this and you should figure it out.

Check the compressor clutch manually with the engine off. Make sure is turns with no hard spots and it should have some resistance. Then check to see if the system has any pressure by pressing the low side valve in. You should know if it has sufficient pressure, unless you have a guage set. If that is ok then check for power at the compressor plug. If not check fuses and relays for A/C system. If you have power where you should and the compressor still does not engage you need to find the high side switch and unplug it. With the car running and A/C on jump the two pins with a jumper wire and see if the compressor engages. If not, its a bad high side switch. Also your compressor coil can go out causing the clutch not to engage. Also if you determine its low on freon you can re-charge it by yourself with one of the kits from the parts store.

JDs00GT · 09-25-2006, 02:24 PM

yeah i think it's somewhere in the electrical side of it, maybe a relay or something. will any problems like that show on an OBD scan?

**bighoss88lx** · 09-25-2006, 02:29 PM

Quote:

Originally Posted by JDs00GT

yeah i think it's somewhere in the electrical side of it, maybe a relay or something. will any problems like that show on an OBD scan?

Nope. If you know you have a sufficient amount of refrigerant in the system and the high side switch is OK, you have a wiring, fuse, relay, or AC control head problem.

2k4mk1 · 09-25-2006, 02:55 PM

Even without freon if the clutch is good it will close when elec is applied to it.

**bighoss88lx** · 09-25-2006, 03:21 PM

Quote:

Originally Posted by 2k4mk1

Even without freon if the clutch is good it will close when elec is applied to it.

Yes, when the switch it jumped.

JDs00GT · 09-26-2006, 07:12 AM

well thanks for the input guys. i think it's just time for the wife to put the old steed down and pick up a new one. we'll see what happens.

09-25-2006, 01:10 PM	#1
JDs00GT Registered User Join Date: Apr 2006 Posts: 166 Trader Rating: (0)	A/C Help. AC on the wifes 98 3.8 went out. the compressor has been replaced, but still no worky. When i jump the low pressure switch back by the firewall, the fan kicks on, but still no compressor clutch engagement, same thing when i jump the connector on the actual compressor. Anyone have any ideas? No leaks or anything, coolant levels are right where they're supposed to be. All fuses are good. __________________ 2000 GT- Sold 1996 Mystic SVT-Sold 2004 GT-Wifes Daily 1998 V6-Sold 2005 WRX STi- Daily/Toy

09-25-2006, 01:14 PM	#2
2k4mk1 Never treat a Lady like a Bitch!!! Join Date: Dec 2003 Location: SanAntonio Posts: 6,083 Trader Rating: (1)	Sounds like the compressor clutch is bad. If it doesnt engage when energized yopu need to replace the clutch. Nothing more than an electro magnet. __________________ 04 Oxford White MACH1,5 SPD with IUP,K&NAircharger Borla Stingers,SLP Catted X pipe,Tri-ax,SCT Flashtune,Max Mtr Spt 4 bolt adj C/C plates, Drilled/Slotted rotors all 4 corners 281 rwhp on Mustang Dyno,306 rwhp on a Dynojet 94 Black Lightning Daily Driver&85GT FACH1 Project under construction

09-25-2006, 02:09 PM	#3
JDs00GT Registered User Join Date: Apr 2006 Posts: 166 Trader Rating: (0)	what are the odds though of the clutch being bad on two different compressors __________________ 2000 GT- Sold 1996 Mystic SVT-Sold 2004 GT-Wifes Daily 1998 V6-Sold 2005 WRX STi- Daily/Toy

09-25-2006, 02:17 PM	#4
bighoss88lx Killing is my Business...And Business is Good! Join Date: Aug 2003 Location: Elmendorf, Tejas Posts: 5,952 Trader Rating: (1)	This is a reply I typed up on another AC thread...Im lazy. Go by this and you should figure it out. Check the compressor clutch manually with the engine off. Make sure is turns with no hard spots and it should have some resistance. Then check to see if the system has any pressure by pressing the low side valve in. You should know if it has sufficient pressure, unless you have a guage set. If that is ok then check for power at the compressor plug. If not check fuses and relays for A/C system. If you have power where you should and the compressor still does not engage you need to find the high side switch and unplug it. With the car running and A/C on jump the two pins with a jumper wire and see if the compressor engages. If not, its a bad high side switch. Also your compressor coil can go out causing the clutch not to engage. Also if you determine its low on freon you can re-charge it by yourself with one of the kits from the parts store. __________________ 1988 Mustang LX

09-25-2006, 02:24 PM	#5
JDs00GT Registered User Join Date: Apr 2006 Posts: 166 Trader Rating: (0)	yeah i think it's somewhere in the electrical side of it, maybe a relay or something. will any problems like that show on an OBD scan? __________________ 2000 GT- Sold 1996 Mystic SVT-Sold 2004 GT-Wifes Daily 1998 V6-Sold 2005 WRX STi- Daily/Toy

09-25-2006, 02:55 PM	#7
2k4mk1 Never treat a Lady like a Bitch!!! Join Date: Dec 2003 Location: SanAntonio Posts: 6,083 Trader Rating: (1)	Even without freon if the clutch is good it will close when elec is applied to it. __________________ 04 Oxford White MACH1,5 SPD with IUP,K&NAircharger Borla Stingers,SLP Catted X pipe,Tri-ax,SCT Flashtune,Max Mtr Spt 4 bolt adj C/C plates, Drilled/Slotted rotors all 4 corners 281 rwhp on Mustang Dyno,306 rwhp on a Dynojet 94 Black Lightning Daily Driver&85GT FACH1 Project under construction

09-26-2006, 07:12 AM	#9
JDs00GT Registered User Join Date: Apr 2006 Posts: 166 Trader Rating: (0)	well thanks for the input guys. i think it's just time for the wife to put the old steed down and pick up a new one. we'll see what happens. __________________ 2000 GT- Sold 1996 Mystic SVT-Sold 2004 GT-Wifes Daily 1998 V6-Sold 2005 WRX STi- Daily/Toy

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