A/C problem on '93 wagon

Worknclassbug · 08-13-2007, 08:17 AM

For some time I've had a problem with the a/c working intermitently. It would sometimes just not come on at all or just shut off after working for a while. Everything was coming on except the compressor. I finally tracked down the problem today. I pulled the glovebox out and dug around a little on the HVAC unit box. I pulled out the fan resistor module so that I could see inside the HVAC box. I could see the evaporator and the thin copper tube that should be the thermocouple device that turns off the compressor when the evaporator gets cold enough. I could not see where it went though. On top of the HVAC box I found another small black box that has two grey wires coming out of the top of the HVAC box going into the back of it and a regular wire connector on the front. I started the car and turned on the a/c and got nothing until I gave the little relay a little pull and then the a/c came on. When I pushed the relay back into it's little cradle I lost the a/c. As long as I had the relay pulled out of it's cradle and hanging the a/c worked. I tried the same thing again today and the same thing happened. I know I have a short somewhere. Probably in the grey wires going into the HVAC box. My question is where can I find a break down of the HVAC sytem of my car so that I can figure out what this relay/sensor thing is called and figure out where the grey wires wind up without pulling out the whole dash. Anybody have any ideas? I'm going to try to snap a picture of the thing tomorrow.

* Registered users of the site do not see these ads.

Ej22techie · 08-14-2007, 12:20 AM

it might be the evaporator sensor... they do go bad on these cars.

Worknclassbug · 08-15-2007, 09:22 PM

It appears that is what I'm looking at. I'm gonna check on a new one tomorrow. Anyone ever replace one? Looks like it may be a pain.

Worknclassbug · 09-04-2007, 09:08 PM

Turns out it wasn't that bad to disasemble the evaporator unit. The new sensor is $67 but it will be worth it if that fixes the problem. Getting one ordered tomorrow. It looks a little cheap. Looks like something I would make on my workbench. Maybe that's why it failed...lol.

08-13-2007, 08:17 AM	#1
Worknclassbug Scooby Newbie Member#: 153236 Join Date: Jul 2007 Location: Huntington WV	A/C problem on '93 wagon For some time I've had a problem with the a/c working intermitently. It would sometimes just not come on at all or just shut off after working for a while. Everything was coming on except the compressor. I finally tracked down the problem today. I pulled the glovebox out and dug around a little on the HVAC unit box. I pulled out the fan resistor module so that I could see inside the HVAC box. I could see the evaporator and the thin copper tube that should be the thermocouple device that turns off the compressor when the evaporator gets cold enough. I could not see where it went though. On top of the HVAC box I found another small black box that has two grey wires coming out of the top of the HVAC box going into the back of it and a regular wire connector on the front. I started the car and turned on the a/c and got nothing until I gave the little relay a little pull and then the a/c came on. When I pushed the relay back into it's little cradle I lost the a/c. As long as I had the relay pulled out of it's cradle and hanging the a/c worked. I tried the same thing again today and the same thing happened. I know I have a short somewhere. Probably in the grey wires going into the HVAC box. My question is where can I find a break down of the HVAC sytem of my car so that I can figure out what this relay/sensor thing is called and figure out where the grey wires wind up without pulling out the whole dash. Anybody have any ideas? I'm going to try to snap a picture of the thing tomorrow. * Registered users of the site do not see these ads.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Opinions on '93 Legacy Touring Turbo AWD Wagon	abracc	Newbies & FAQs	2	12-31-2007 08:50 AM
Engine problem on 96L wagon Automatic	toysnyc	Legacy Forum	5	11-20-2007 04:08 PM
Simple Question: Will '02 WRX Struts Work on '93 L Wagon?	dug-e-fresh	Brakes, Steering & Suspension	1	01-11-2006 05:51 PM
'02 WRX suspension on '93 Legacy wagon	mch	Legacy Forum	5	04-20-2003 12:51 PM
('93-'01) Opinions on '93 Impreza wagon	mikemo	Impreza Forum	6	06-21-2001 12:36 PM

08-14-2007, 12:20 AM	#2
Ej22techie Scooby Newbie Member#: 156051 Join Date: Aug 2007 Location: Chicago, IL Vehicle: 1997 Legacy L Sedan	it might be the evaporator sensor... they do go bad on these cars.

08-15-2007, 09:22 PM	#3
Worknclassbug Scooby Newbie Member#: 153236 Join Date: Jul 2007 Location: Huntington WV	It appears that is what I'm looking at. I'm gonna check on a new one tomorrow. Anyone ever replace one? Looks like it may be a pain.

09-04-2007, 09:08 PM	#4
Worknclassbug Scooby Newbie Member#: 153236 Join Date: Jul 2007 Location: Huntington WV	Turns out it wasn't that bad to disasemble the evaporator unit. The new sensor is $67 but it will be worth it if that fixes the problem. Getting one ordered tomorrow. It looks a little cheap. Looks like something I would make on my workbench. Maybe that's why it failed...lol.