20007 Freightliner Columbia AC lines and evaporator to main and bunk freezing solid root cause?

Hulld · May 10, 2023

Volvoowner007 said: ↑

What relay, can you post pictures?
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I am not with the truck now but should be tomorrow.
I will see if I can get a picture then.

Volvoowner007 · Jun 29, 2023

Hulld said: ↑

I am not with the truck now but should be tomorrow.
I will see if I can get a picture then.
Click to expand...

Post a picture it’s been years!

Rideandrepair · Jul 4, 2023

Great info. Now if only I can remember if needed. Lol. Post picture if possible. Fuse panels usually not marked well. Description from ID panel also if possible.

Smellfunny · Jul 4, 2023

The dude was from the future with a 20007 Freightliner. I doubt if he will come back and tell us what relay it was. : )

Blue87 · Oct 28, 2024

Hulld said: ↑

The 8 hr road test was a success!!
Here’s the deal…
I pulled the wiring that goes to the AC clutch out of the loom to check it.
I then noticed it had a pretty substantial wire gauge size.
After seeing that I knew it had to be activated thru a relay to handle that kind of amperage.
So in my head I also knew the only way the ac compressor could be powered full time through the relay when all the controls were off was it was either somehow being commanded on by the system or the contacts in the relay were stuck together?
Well it turned out to be the latter the contacts were stuck together and my poor little ac compressor was running its heart all day and not cycling so it would freeze the system solid.
I swapped out the relay with another relay in the fuse box and it works perfectly now.
I thought it was important to post the fix as to many threads here go unfinished with out the answer to what actually fixed the problem.
Thank you to everyone who posted help to me and hopefully this thread can be beneficial to someone else someday with the same issue.
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I’m having same issue. I’ll see if that solves my issue. Thank you

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