Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Advice needed for correct oil level - Sanden Ht6 RetroFit

TominKY on Fri July 18, 2008 2:51 PM User is offline

Year: 1997
Make: GMC
Model: Suburban
Engine Size: 5.7
Refrigerant Type: 134a
Country of Origin: United States

I am in the process of installing a new Sanden SD7 to replace the leaky HT6 on my 97 'Burb. The truck had a pinhole leak on the hi-pressure line leading back to the rear evap, which was repaired. I removed the old HT6, and found very little (
I realize that the only sure way to know the total oil charge would be to flush both evaps and the condenser, but I do not have the required flushing equipment at my disposal. Does this sound like a reasonable plan of action?

Thanks for any advice!

Edited: Fri July 18, 2008 at 4:13 PM by TominKY

Chick on Fri July 18, 2008 6:53 PM User is offlineView users profile

I would add at least 4 to 4 1/2 ounces back, however you are correct, the only way to know for sure is to flush the system..Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

chris142 on Fri July 18, 2008 10:04 PM User is offline

Seems that the 97 Burbans were the ones that had the lines rubbing up by the front wheel

That system is pretty big so even if you put a few oz too much oil in it it won't matter.

It sounds like it's pretty low. If it came to my shop I would add back 3.5 oz of oil per pound or refrigerant. Thing holds 4 lbs dont it? That would be 14 oz or so and not worry about a few extra ounces that are in there.

Anyway this is what I would do but others may not agree.

TominKY on Sat July 19, 2008 12:05 AM User is offline

Thanks for the replies, guys.

Chick, do you mean you would add 4 1/2 oz to the accumulator, or is that 4 1/2 total, including what is in the compressor. I am pretty sure you mean the former.


TominKY on Sat July 19, 2008 10:15 AM User is offline


This one was actually leaking by the front wheel, but it wasn't from rubbing. The rubber sleeve that GM put over the line to protect it from rubbing actually served the purpose of trapping salt and water from winter road salting up against the aluminum line where it could do its dirty work. I had a pinhole leak develop from the corrosion. I had a local welding shop TIG weld it for a repair. Beats paying GM $175 for a new line!

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.