Hey guys goodmorning. I just finished putting everything back together doing the AC Evap/heater core replacement. But i am leaking (not a slow - loud hissing)R134a at the A/C line connector to the firewall (engine side). Did you guys replace your o-rings? Hopefully this will do it. Both lines are on and I heard a click when re-installing the lines (spings engaging). I hope i didn't damage the lines when disconnecting.

Many thanks
O

 

Didn't the new evap core come with news ones?

 

i don't think so but i will double check the box.

 

nope no o-rings. Are they suppose to supply new o-rings? I got it from Rockauto.

 

Sorry I don't remember. Maybe it was the accumulator I was thinking of. Did you use the ones off the old evap core?

 

It's always a good idea to get new O-rings when doing a job like this. Since you are going to have to take it apart again, get yourself a set of new O-rings and replace them. You also forgot to vacuum the system. The reason to do that is to check to see if you have any leaks before filling with freon.

 

Well, that's not the only reason, but good call. I completely forgot about the most important part of the process. Shame on me.

 

Your right zman, I only hit on one reason. The other reason is to burn off any moisture that is in the system. Many people only vacuum for 30 minutes and think it's done. I have read it's good to vacuum and let sit for 45-60 minutes. Some may even do a couple of vacuums to burn off any moisture. I have also read about using sacrificial freon to test your system and evacuate any moisture in the system. The OP or user of a given system has to judge just how much of a moisture issue they have in their system based on how long the system has been open to the environment. I know you know this stuff zman but for most people moisture may not seem like a real problem, but when mixed with freon it makes an acid and eats away your system from the inside out.

 

Don't forget that o-rings are specific to the type of system/freon being used. You can't just use any kind of o-ring in A/C systems. Some can be damaged by certain A/C chemicals resulting in leaks.

 

I just picked up a new set of o-rings from autozone. Actually a whole bag of o-rings for A/C. Do I need to lubricate these o-rings? if so, what type of oil?

thanks guys