Originally Posted by billygoat
It took me somewhere around 12 hours to take apart the dash, install the evap, and put it back together.
As for flushing the evap core, every mechanic I talked to said it can't be done with the late model Tacomas. I know that many evap cores in other cars can be flushed, but the one in the Tacoma is a plate and fin design whereas most older designs are tube and fin. If any metal bits remain wedged inside the narrow passages of the fins and come loose at a later time, then the new compressor is toast.
As for the filter catching any metal debris in the system, there are three reasons not to rely on this: 1) The filter is not designed to catch a lot of debris and will clog, 2) The filter is not fine enough to catch everything (it's a fine mesh, much like a reusable coffee filter, and any particles that pass through it will cause excessive wear on the compressor and a shortened lifespan), and 3) the filter no longer works when the compressor seizes. There is a very high pressure differential inside the A/C system, and the compressor is the only thing that keeps if flowing in the right direction. If the compressor seizes during operation, then there is an almost explosive and instantaneous backflow throughout the entire system, and this will send debris to the evap through the line without the filter.
One out of four mechanics told me that the expansion valve would catch debris and protect the evap core. He was wrong. I found more metal pieces inside the evap core than anywhere else in the system, and plenty of them were very large (a milimeter or more in length). The backflow that results from compressor failure is powerful enough to force contaminants deep into the evap core despite the constricting nature of the expansion valve.
Taco'09, I am sorry to contradict you on so many things. I know you are trying to help, and I think most people here appreciate that. I also think most people (here and elsewhere) really don't want to tear apart the dash if they don't have to. I agree that it is very time consuming and can be quite frustrating.
To anyone who has had a severe compressor failure on their late model Tacoma, I am very, very sorry to say this, but the this one of the worst vehicles that this could happen to. There is just no easy way to fix the problem. The evap core is not designed to be flushed. A helpful way to look at is like this: When fixing a failure under warranty, the dealership does what costs them the least amount of time and money in the long run. If the compressor seizes under warranty, the dealership replaces the entire system, evap core included, at their expense. I had a long talk with a Toyota tech who switched to a private shop, and he made this point to me. He also was very apologetic--he had apparently replaced several A/C systems on the late model Tacomas.
I'll work on getting the instruction set up, but since getting a degree in technical writing I've started working towards one in mechanical engineering, and between work and school I have been rather pressed for time. I'll post a link when I have it up.
, no problem whatsoever on setting me straight. You are the one that had the compressor failure not me so I appreciate the feedback. I had to go in to the HVAC unit for reasons other than a compressor failure and it just looked to me like it could be done without pulling the evap. core out of the HVAC unit. If it can't, it can't.
This is one job that few would probably undertake and frankly, knowing what I learned about the necessary surgery of this system, it would probably be a deal-killer for me if I had an eye on a 2nd gen. with A/C problems.
You already know this OP
but for others that whole AC system from the compressor to the HVAC unit including the electrical components of it are not
Denso like on the older trucks but Delphi (that's right cheap GM components) and the biggest pile of junk you have ever seen, at least IMHO. I'm surprised it works at all.