Mitsubishi Lancer and Lancer Sportback Newer to the United States, the Lancer line offers a sporty compact sedan, with all of the fine styling of the performance minded Evolution.

03 Lancer A/C Expansion Valve Replacement Questions

Old 08-12-2011, 01:07 PM
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Default 03 Lancer A/C Expansion Valve Replacement Questions

Hi everyone. So my a/c compressor clutch has been noisy for like a year and finally gave up the ghost about a month ago to the point where the compressor seizes and I bust my a/c and p/s drive belt.

I'm getting tired of the heat and even more tired of no power steering. I decided to bite the bullet and I purchased a new a/c compressor and I'm ordering the receiver/drier and o-ring kit today.

I've been doing a great deal of research and I plan on removing and flushing all the lines. Most sites also say you should inspect/replace the expansion valve whenever a component fails. I'm a little worried about how hard the expansion valve is to get to.

I have a PDF disc of the factory service manuals and their drawings and instructions I've always found to be misleading and they tend to over estimate how much crap you need to remove to get to things.

From the service manual it LOOKS like the expansion valve is mounted on the back of the evaporator inside the heater unit case. Their instructions seem to indicate I need to remove the entire dash, the heater core etc. to get to it. I know the area is a little tight but then again when I did the blend/door and heater cable swap in the famous "Temperature selector hard to turn" TSB they recommended a TON of work that wasn't necessary to actually get to things.

Has anyone swapped out an A/C expansion valve on a lancer similar to mine? I have the 2003 Oz Rally. Can it be managed without removing the ENTIRE dash and heater core or is that required to get to things from above? I'd love to hear from someone how hard that part is, because it generally seems to be the biggest PITA of all.
Old 08-19-2012, 11:01 AM
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I know this is an old question/thread, but I was looking for the answer to this yesterday and could not find it. We ended up doing a lot of unnecessary work because we couldn't find a solid answer on the here it is.

My girlfriend has a 2006 Lancer ES 2.0. We replaced the A/C Compressor, the reciever drier, the expansion valve, and flushed the lines.

After a couple of hours of tearing the dash apart trying to get to the heater core box we realized that the Expansion Valve can be removed from the 'engine side' of the firewall. Follow your high pressure and low pressure lines until they dissapear into the firewall. This should be right behind the engine block near the middle. There are 3 bolts, 1 is a 10mm socket. Remove that one first, next there are two little bolts with hex heads on them. They should be a metric 8 allen key. Once you remove those 3 bolts you should be able to just pull and the plastic boot covering the expansion valve AND the expansion valve itself will come right out. Given that you've disconnected the lines already from the compressor.

Hope this helps anyone trying to replace one of these. We spent 3 hours tearing the dash apart and 3 more hours putting it back together once we realized we didn't need to.
Old 03-16-2013, 02:35 AM
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Join Date: Mar 2013
Posts: 2
Default Does anyone know about 2002 Lancer?

Longtime reader but first time poster.

I have a 2002 Mitsubishi Lancer and thinking of doing the same as OP. Does jrb1and2 or anyone know the location of expansion valve for 2002 Lancer?

It seems like 2002 through 2006 Lancers have similar if not same parts.

If anyone sees this can they confirm? May be some kind 2002 Lancer owner who has done this or has capability to do this might happen to read this?
Old 03-17-2013, 07:43 PM
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Anyone please...I need to replace compressor with drier and expansion valve.
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