any air conditioning problems with 1999 sl 500?

Asked by Jul 16, 2012 at 07:16 PM about the 1999 Mercedes-Benz SL-Class

Question type: Maintenance & Repair

i am thinking about buyiny a 99 sl 500, 60k miles, for 14995. Have carfax and other reports but the air wont blow cold, or even cool. Compressor? Leak? Any ideas?

4 Answers


AC problems are almost impossible to diagnose without doing tests on it. One of the best methods is to recharge the system with UV dye in the system. Run it for a while and then use a UV light to find the leak. Most shops will do this for you if they are used to doing AC work.


I'd have the seller do the diagnostic if possible. I've got a sl500 a couple of years older, with same problem of no cold air. Leak in the evaporator, which is behind the dashboard - about a $2,000 job.


Low coolant is always a sign of leak, the system is sealed, refilling the coolant is a short term solution usually lasts about 2 years the alternative(s) is expensive.

1 of 1 people found this helpful.

My '89 has this problem now (the AC used to work great until a week ago). The coolant (R12 Freon) has leaked out. I had a radiator/AC specialist repair shop diagnose it at the recommendation of my local MB mechanic. The problem seems to be blown hose. Cost to replace hose is $400 due to having to remove the air filter unit to get at the AC manifold. Then he will need to refill the lines with coolant. R12 is the coolant used in cars this old and since there are not so many on the road it is expensive: $300 for the coolant alone. My car is old but only 150,000 miles and otherwise running great, so I am taking the plunge on this repair. Just posting it because it is not as expensive a fix as some have suggested above.

1 of 1 people found this helpful.

Your Answer


Looking for a Used SL-Class in your area?

CarGurus has 3,221 nationwide SL-Class listings starting at $4,930.


Mercedes-Benz SL-Class Experts

  • #1
  • #2
    Michael Kane
  • #3
View All

Related Models For Sale

Used Mercedes-Benz S-Class
120 Great Deals out of 7,156 listings starting at $1,980
Used Chevrolet Corvette
107 Great Deals out of 15,743 listings starting at $4,500
Used Porsche 911
97 Great Deals out of 5,094 listings starting at $8,998
Used Mercedes-Benz E-Class
427 Great Deals out of 20,627 listings starting at $1,999
Used Mercedes-Benz SLK-Class
40 Great Deals out of 1,277 listings starting at $1,492
Used Mercedes-Benz CL-Class
18 Great Deals out of 511 listings starting at $4,000
Used Porsche Boxster
37 Great Deals out of 1,187 listings starting at $4,000
Used Mercedes-Benz CLK-Class
26 Great Deals out of 1,106 listings starting at $2,600
Used BMW 7 Series
102 Great Deals out of 5,028 listings starting at $2,699
Used Mercedes-Benz C-Class
606 Great Deals out of 25,311 listings starting at $1,950

Used Cars For Sale

2017 Mercedes-Benz SL-Class For Sale
92 listings starting at $69,994
2016 Mercedes-Benz SL-Class For Sale
92 listings starting at $55,685
2015 Mercedes-Benz SL-Class For Sale
10 Great Deals out of 283 listings starting at $39,888
2014 Mercedes-Benz SL-Class For Sale
147 listings starting at $39,900
2013 Mercedes-Benz SL-Class For Sale
169 listings starting at $34,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.