I was thinking ahead today about if I have to remove the evaporator on the Chevy Luv truck I'm working on. So I tried to break the joint apart on the low side. It didn't want to come apart, using a back up wrench and another to turn the slip joint side. The fixed nut is alum and the slip nut is steel.. with so many years together, it doesn't want to come loose. Any suggestions, I've applied some Kroil which I've used for many years with good results. Can I use some heat to make it give way if it comes to having to get it apart.
That is galvanic corrosion- there are methods- but I've never got them to work- the aluminum threads will stay in the steel nut if you continue- Do a forum search for galvanic corrosion..
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
I understand what galvanic corrosion is but the scearch didn't turn up anything here on the fourm. I've had the threads to come off before with the two different metals, a real bad feeling.. I had done a scearch on this but didn't find anything that addressed the problem. I may not have put in the right words to get the answers....
Try these for starters.
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