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 Andy Your Own Question
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1571
Experience:  International trucks, International, Maxxforce and Cummins engines, diagnostic, electrical, Hvac and refrigeration repairs
30303843
Type Your Medium and Heavy Trucks Question Here...
Andy is online now
A new question is answered every 9 seconds

2007 freightliner columbia ac quit working. Ac clutch won't

Customer Question

2007 freightliner columbia ac quit working. Ac clutch won't engage unless I jump it
JA: We'll do all we can to help. Tell me a bit more about what's going on so the Heavy Equipment Mechanic can help you best.
Customer: Checked all fuses and relays and replaced binary switches bit nothing still
JA: Is there anything else the Heavy Equipment Mechanic should be aware of?
Customer: Snowflake light in dash stays on regardless if I press button to turn off. Replaced aluminum lines, both expansion valves, dryer, compressor and clutch last year. Replaced binary switches today.
Submitted: 3 months ago.
Category: Medium and Heavy Trucks
Expert:  Andy replied 3 months ago.

Hi my name is Andy ! Would a wiring diagram help you ?

Expert:  Andy replied 3 months ago.

If so , then i would need the full 17 digit vin number please ?

Customer: replied 3 months ago.
I just added three cans of freon within the last two days after replacing binary switches. I just probed low side thinking it might be overcharged and it was empty
Expert:  Andy replied 3 months ago.

Oh oK . Then we need to pressure test the system using nitrogen at 300 psi and check for leaks.

Customer: replied 3 months ago.
I don't have that nor did I see any signs of freon evaporating
Expert:  Andy replied 3 months ago.

You need to be able to raise the pressure inside the system everywhere in order to be able to find any leak. Nitrogen at 300 psi is a good way . Another way you can try and locate a leak is to fill system back up to spec with some dye injected into system . Then run systme for awhile like 1 hr , and then check for leaks with a UV light and yellow glasses .

Customer: replied 3 months ago.
Great I'll do that. Was looking hard between clutch and compressor and think it might be slightly moist. Gonna confirm with dye.
Expert:  Andy replied 3 months ago.

Do you see any other wet spots around condenser area or any lines in the system ? Around switches or sensors ? Any connection points ? These would all be signs of a leak.

Customer: replied 3 months ago.
No signs whatsoever. Was working fine while driving. Quit working suddenly last Friday. Gonna check with dye to detect leak.
Expert:  Andy replied 3 months ago.

Ok ... Good luck ! I hope it works out for you . Please do not forget to rate my service to you at the end of this session . Feedback is important and bonus is greatly appreciated . Thank you for your question !

Customer: replied 3 months ago.
No problem
Expert:  Andy replied 3 months ago.

Thank you . Have a great day !

Customer: replied 3 months ago.
You too. Will get back to you tomorrow.
Expert:  Andy replied 3 months ago.

ok

Expert:  Andy replied 3 months ago.

Hi there ! It's been a few days ! How have you made out with the AC problem ?

Customer: replied 3 months ago.
I've left it alone but think it might be a hose.

Related Medium and Heavy Trucks Questions