Heater started blowing cool air rather than warmer air.

105

Asked by Oct 26, 2013 at 12:31 PM about the 2000 Mercedes-Benz SL-Class SL 500

Question type: General

No problems until yesterday. Heater started blowing warm air and after 20 minutes started
blowing cool air. The auto was not on, as usual I was using the fan to control the air flow. I
elevated the temp to 80 to get the heater to blow barely warm air.

4 Answers

I'd look at the coolant level....and a stuck thermostat~

2 of 2 people found this helpful.
105

If it was a stuck thermostat wouldn't the temp gauge be affected also? The temp gauge is normal.

3 of 3 people found this helpful.

if the coolant level is normal...the coolant itself is not "rust-water" would "belch" the cooling loop so that it is not air-bound~ make sure the coolant level is okay. the thermostat opens up the cooling loop to the heater core...you MAY not overheat....rust water/clobbered thermostat...aside from air-bound can think of nothing else that it could be~

1 of 1 people found this helpful.

run without the thermostat for a spell and check to see if the heater core is plugged....a garden hose on one of the coolant loop connections with the output going into 5 gal buckets for recapture might happen if the heater core is clobbered with rust~

1 of 1 people found this helpful.

Your Answer

SL-Class

Looking for a Used SL-Class in your area?

CarGurus has 2,887 nationwide SL-Class listings starting at $4,500.

ZIP:

Mercedes-Benz SL-Class Experts

  • #1
    bobkat
    Reputation
    1,310
  • #2
    twhobie
    Reputation
    460
  • #3
    Michael Kane
    Reputation
    440
View All

Related Models For Sale

Used Mercedes-Benz S-Class
168 Great Deals out of 5,633 listings starting at $2,000
Used Mercedes-Benz E-Class
466 Great Deals out of 19,709 listings starting at $1,400
Used Mercedes-Benz SLK-Class
59 Great Deals out of 1,184 listings starting at $2,995
Used Porsche 911
126 Great Deals out of 4,974 listings starting at $8,900
Used Chevrolet Corvette
290 Great Deals out of 20,736 listings starting at $2,990
Used Mercedes-Benz C-Class
588 Great Deals out of 25,389 listings starting at $1,995
Used Mercedes-Benz CL-Class
25 Great Deals out of 492 listings starting at $2,995
Used Mercedes-Benz CLK-Class
44 Great Deals out of 1,143 listings starting at $1,750
Used BMW 3 Series
1,106 Great Deals out of 32,629 listings starting at $1,000
Used BMW 7 Series
144 Great Deals out of 5,852 listings starting at $2,500
Used BMW M3
41 Great Deals out of 1,718 listings starting at $5,995

Used Cars For Sale

2017 Mercedes-Benz SL-Class For Sale
196 listings starting at $73,795
2016 Mercedes-Benz SL-Class For Sale
51 listings starting at $54,999
2015 Mercedes-Benz SL-Class For Sale
10 Great Deals out of 125 listings starting at $49,991
2014 Mercedes-Benz SL-Class For Sale
5 Great Deals out of 178 listings starting at $49,483
2013 Mercedes-Benz SL-Class For Sale
168 listings starting at $38,995

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.