Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

what activates the auxiliary fan when the air conditioning is on?..SL…

Customer Question
what activates the auxiliary fan...
what activates the auxiliary fan when the air conditioning is on? l975 450 SL
Submitted: 8 years ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 9 minutes by:
6/16/2010
Mercedes Mechanic: Marty, Mercedes Technician replied 8 years ago
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,291
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified
Chat Conversation Started
eurotec :

Hi, there should be a switch mounted in the a/c drier to activate the auxiliary fan. I've attached a picture below.

eurotec :

Full Size Image

eurotec :

Full Size Image

Customer:

What is the name of this part? Where is it located?

eurotec :

It is the a/c temperature switch and it is mounted in the receiver drier.

Customer:

Where do I look for the receiver drier?

Customer:

I found the part-what is the name of this part so I can order it from merz?

Customer:

Will removing it let the freon escape?

eurotec :

Before you do that turn the air on and connect the two wires together and see if the fan comes on.

Customer:

I conneccted the two wires and the fan started.

eurotec :

Ok, do you have the red switch or the gold switch?

eurotec :

If it's the gold switch the part # XXXXX XXXXX 820 80 10. If it's the red switch the part # XXXXX XXXXX 820 68 10.

Customer:

I really can't tell what color it is but it isn't red-it looks black.

eurotec :

If you look at my pictures it will look more like one than the other. If it's like the top picture you will not lose any refrigerant when you remove it. If it's like the bottom picture you will need to remove the refrigerant first.

Customer:

well it looks like the second picture-bottom-what number is XXXXX?

eurotec :

The bottom picture is part # XXXXX 820 68 10. You will need to evacuate the system to replace it.

Customer:

OK-thanks a lot-great job-

eurotec :

You're welcome. Good luck with it!

Ask Your Own Mercedes Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mercedes mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Marty Your Own Question
Marty
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,291
55,291 Satisfied Customers
Experience: Bosch Certified Master Tech. Over 35 years experience.

Marty is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

55,291 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

4,460 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
Have s 78 450 sl small pump that all heater hoses go into is
Have s 78 450 sl small pump that all heater hoses go into is leaking wgat is this part called?… read more
Michael Warfield
Michael Warfield
Factory Mercedes-Benz Technician
Vocational, Technical or Trade Scho
3,132 satisfied customers
450 sl: I have a Mercedes 107 450 SL. It was running too fast.
I have a Mercedes 107 450 SL. It was running too fast. A mechanic suggested that the WUR needed to be replaced. I did so it made no difference. I replaced the Auxilliary Air Valve. It was defective. B… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
Mercedes-Benz 450SL: no power to the electric fuel pump on
no power to the electric fuel pump on my 1980 mb 450 sl, replaced the fuel relay switch, can't find any fuses blown, need help.… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
Mercedes-Benz 450 SL: Jai une Mercedes 450 SL 1980. Le moteur
J'ai une Mercedes 450 SL 1980. Le moteur surchauffe. J'ai changé l'antigel, le thermostat et la fan shroud mais il surchauffe toujours à basse vitesse. Que dois-je faire.… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
Is there an easy way to replace the Air Compressor on a 77
Is there an easy way to replace the Air Compressor on a 77 450 SL? How many hours labor is normal?… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
Disturbing fan-sound!I dont like the sound from the fan on my 450 SL -
Disturbing fan-sound! I dont like the sound from the fan on my 450 SL - 1973. Is it possible to modify the fan-system?… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
Mercedes-Benz 300CE: The large fan outside the radiator comes
The large fan outside the radiator comes on [very loud ]for most of the time when driving. Sometimes at tick over it goes off for a second and then on again repeatedly. Someone told me the fan is for … read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
With climate controls console..blower changes speed..compressor
We have a 1978 450 SL, S#107XXX-XX-XXXX06. With climate controls console, when you push the buttons the blower changes speed and the air comes out either on the defrost or on the floor, never in the c… read more
Michael Warfield
Michael Warfield
Factory Mercedes-Benz Technician
Vocational, Technical or Trade Scho
3,132 satisfied customers
things I need to do to tune up my 450 sl ?..example change air filter
what are the things I need to do to tune up my 450 sl ? for example change air filter, etc.… read more
hauto
hauto
Operate own repair shop
Bachelor's Degree
1,637 satisfied customers
4.5 v8 also cap and rotor also cleaned air valve car..idling
Have a 73 450 sl changed plub and wires 4.5 v8 also cap and rotor also cleaned air valve car still lacks power sounds a little loud idling… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
I change from viscosity driven fan to electrical fan..low speed..tight
Can i change from viscosity driven fan to electrical fan ? My viscosity fan is unstabil and the fan also makes alot of noise on low speed. I bought a new viscosity unit last year, but still not good (… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
1976 mercedes: sl..runs great..2200 rpm, as car warms..1000 rpm..screw
1976 mercedes 450 sl, Came ro me in boxes, all back togather now runs great, except cold start up 2200 rpm, as car warms 130, 1600 rpm and at180, 1000 rpm. after car is at full temp perfect. idle scre… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
1974 MERCEDES: AUXILIARY..FRONT OF THE RADIATOR..MECHANICS
I HAVE A 1974 MERCEDES 450'SL. THE CAR DOES NOT HAVE AN " AUXILIARY FAN IN FRONT OF THE RADIATOR. I DISCUSSED THIS WITH 2 MERCEDES MECHANICS OVER THE SUMMER. ONE SAID THAT IT SHOULD HAVE AN "AUX FAN""… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
450 mercedes: sl..the idle linkage all the way back
I have just bought a 1977 sl 450 mercedes and the idle is at 1400rpm and it will not drop down to 700rpm like it should. The old owner had ajusted the idle linkage all the way back. So now what? Larry… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
1999 Mercedes E430: temperature gauge..idling..temp gauge..back down
I have a 1999 Mercedes E430 that lately, when stopped at a traffic light, the temperature gauge goes up in relation to how long the car is idling. The longer the light, the higher the temp gauge goes.… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
500 SL runs..ambient..be done to lower engine running temperature?
500 SL runs hot when ambient temperatures are moderate to high. What can be done to lower engine running temperature?… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
450SL: Convertable..27,000 miles on it, and had only 1 owner Jim Otto
I bought a 450SL Convertable about 4 months ago. It only has 27,000 miles on it, and had only 1 owner Jim Otto (former NFL player). It is in pristeen condition. What would you say it is worth.… read more
Marty
Marty
Mercedes Technician
Associate Degree
55,291 satisfied customers
sl..electric power..fuel pressure regulator,but not to the cylinders
I have a 1974 450 sl the car will not start. I am getting electric power to plugs. The fuel is getting to the fuel pressure regulator,but not to the cylinders. If i use starting fluid the car will fir… read more
garyb
garyb
Vocational, Technical or Trade Scho
156 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x