1999 quattro- check engine light and AC blowing warm

hollypop · 04-30-2012, 01:32 PM

I recently got a 1999 2.8 quattro with about 140k miles on it. My check engine light came on and the air conditioner blows, but it only blows warm or hot air. Anyone have any idea what it could be? Thanks

mtroxel · 04-30-2012, 02:30 PM

a) It sounds like you think the two are related. Not necessarily.
b) When a CEL lights up, there are hundreds of possible codes. No one can guess from what you've said. You need to go to an auto parts store and borrow their OBD reader as a starting point.

hollypop · 04-30-2012, 03:06 PM

Any idea about the AC? I'm dying in the Florida heat!

mtroxel · 04-30-2012, 04:31 PM

You gotta give us more than that. Could be:

1. R34 leaked out.
2. Compressor clutch is shot.
3. Compressor is shot.
4. Pressure switch is bad and won't turn switch compressor clutch on.
5. Blower motor isn't blowing.
6. Climate Control head is screwy.

There are any number of things. I think you need to take this to someone with a VAG-COM and get codes. You need data and you don't have any.

GTA_Driver · 04-30-2012, 04:57 PM

And do some searching on these forums. Tonns of info to help you started, and you ought to learn the basics. Almost every basic question has been answered

4Driver4 · 04-30-2012, 04:59 PM

My guess is door number one: bad evaporator.

...but then you all knew that...

mtroxel · 04-30-2012, 05:29 PM

Quote:

Originally Posted by 4Driver4

My guess is door number one: bad evaporator.

You mean the one where you make your dash look like this?

4Driver4 · 05-01-2012, 03:05 AM

Almost. Evap is still in that car in your pic!

mtroxel · 05-01-2012, 05:20 AM

You're right, I was still an hour away from the evap. And that was actually a heater core job. I left the evap in there. That was a mistake. It started leaking the next summer.

04-30-2012, 02:30 PM	#2
mtroxel AudiWorld Senior Member Garage is empty, add now Join Date: Oct 2003 Posts: 922	a) It sounds like you think the two are related. Not necessarily. b) When a CEL lights up, there are hundreds of possible codes. No one can guess from what you've said. You need to go to an auto parts store and borrow their OBD reader as a starting point. __________________ 99.5 A4 Q 2.8 - 179,000 miles Hibiscus Red Mica

04-30-2012, 04:31 PM	#4
mtroxel AudiWorld Senior Member Garage is empty, add now Join Date: Oct 2003 Posts: 922	You gotta give us more than that. Could be: 1. R34 leaked out. 2. Compressor clutch is shot. 3. Compressor is shot. 4. Pressure switch is bad and won't turn switch compressor clutch on. 5. Blower motor isn't blowing. 6. Climate Control head is screwy. There are any number of things. I think you need to take this to someone with a VAG-COM and get codes. You need data and you don't have any. __________________ 99.5 A4 Q 2.8 - 179,000 miles Hibiscus Red Mica

04-30-2012, 04:59 PM	#6
4Driver4 Tech Guru Garage is empty, add now Join Date: Oct 2002 Posts: 32,386	My guess is door number one: bad evaporator. ...but then you all knew that... __________________ 4Driver4 Growing old is mandatory; growing up is optional. 2005 A6 Sedan Q 3.2 (wife's whip) 2000 A4 Avant Q 2.8 (daily driver) 1980 VW Scirocco (mid-life crisis car) 1983 Mazda RX-7 (revolutionary sports car) 2003 Mini Cooper S (just because) 1995 Mazda Miata, Superdupercharged(anti-Audi) 1999 Mazda Miata SSB (track beotch, no plate) 2003 GMC Yukon Denali XL (the anti-earth) 2004 Dodge Dakota (hey, at least it's stick and 4x4)

05-01-2012, 03:05 AM	#8
4Driver4 Tech Guru Garage is empty, add now Join Date: Oct 2002 Posts: 32,386	Almost. Evap is still in that car in your pic! __________________ 4Driver4 Growing old is mandatory; growing up is optional. 2005 A6 Sedan Q 3.2 (wife's whip) 2000 A4 Avant Q 2.8 (daily driver) 1980 VW Scirocco (mid-life crisis car) 1983 Mazda RX-7 (revolutionary sports car) 2003 Mini Cooper S (just because) 1995 Mazda Miata, Superdupercharged(anti-Audi) 1999 Mazda Miata SSB (track beotch, no plate) 2003 GMC Yukon Denali XL (the anti-earth) 2004 Dodge Dakota (hey, at least it's stick and 4x4)

05-01-2012, 05:20 AM	#9
mtroxel AudiWorld Senior Member Garage is empty, add now Join Date: Oct 2003 Posts: 922	You're right, I was still an hour away from the evap. And that was actually a heater core job. I left the evap in there. That was a mistake. It started leaking the next summer. __________________ 99.5 A4 Q 2.8 - 179,000 miles Hibiscus Red Mica

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04-30-2012, 03:06 PM	#3
hollypop AudiWorld Newcomer 1999 Audi A4 Join Date: Apr 2012 Posts: 2	Any idea about the AC? I'm dying in the Florida heat!

04-30-2012, 04:57 PM	#5
GTA_Driver AudiWorld Super User 2005 Audi Allroad Join Date: Aug 2004 Location: Toronto Posts: 2,569	And do some searching on these forums. Tonns of info to help you started, and you ought to learn the basics. Almost every basic question has been answered

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