How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 1219
Experience:  Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles
Type Your Mercedes Question Here...
Chad Farhat is online now
A new question is answered every 9 seconds

How can I tell if the AC compressor is bad. the clutch spins

Customer Question

How can I tell if the AC compressor is bad. the clutch spins freely. It doesn't engage only codes shown were B1459 and the sun sensor code which I understand are common fault codes that don't effect the operation. What should I check next?
Submitted: 17 days ago.
Category: Mercedes
Expert:  Chad Farhat replied 17 days ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 17 days ago.

Hey how are you

1- check that you have full Freon , if the system below 25 % compressor want kick in

if you hook up the ac test gauge what is the low side showing for pressuer 100 psi and up .

go to the compressor relay and jump it see if compressor kicks in

2- ir you unplug the compressor connector and give straight power see if it will kick in

3- how the system stopped , was working good & cold & suddenly stopped or gradually started to get warm and then compressor stopped

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 17 days ago.
It was between 30 and 35psi on the low side as I remember. I have no way to test the high side. Where is the compressor relay? Next to the firewall? Or under the seat? I bought the car with no AC previous owner told me it worked I think he lied.
Customer: replied 17 days ago.
I will put power to compressor in a bit.
Expert:  Chad Farhat replied 17 days ago.

oh i m sorry , but 30 35 psi with car off on low side , means you low of freeon

let me check relay location for you be right back

Expert:  Chad Farhat replied 17 days ago.

there is no relay for the 98 e320 in this system

check under hood fuse box

fuse # 7,8 & 4 . should 10 amp ,20 amp & 7.5 amp

the ac module in the dash is the control for the compressor

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Chad Farhat replied 16 days ago.

Please let me know if you need anything else on it, just reply back and we will continue

If you are good, Please Kindly Rate Me.

A 5 Star Rating is much Apreciatted

If you feel I have not been helpful Please DO NOT RATE ME BAD OR POOR (1 or 2 stars) ,You can always ask me again or I can opt out of your question & open it for another expert ,that will provide you with more or better assistance on this issue

Please keep in mind that when you rate me , it does not end our conversation.

you can always come back to this conversation and ask me any follow up question you may have on this issue

(you can copy this link page & paste it in your browser when ready and it will open up our conversation again)

Thank You
Chad Farhat
ASE Certfied Technicianv