Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

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

Archive Home

Search Auto AC Forum Archives

1990 Honda civic help with diag

brookman69y2k on Mon April 14, 2008 11:28 PM User is offlineView users profile

Year: 1990
Make: honda
Model: civic
Engine Size: 1.5l
Refrigerant Type: r12
Ambient Temp: 80
Pressure Low: 0
Pressure High: 150

Online I see that this uses an expansion valve. The system was empty when my son brought it home. (new used car)

I put a can in and it seemed to be filling normal steady needle on the high side about 150 low side while connected to the can was between 20 and 30.

When the can was near empty I closed the valve and the low side dropped to 0 and then sucked into vacuum. Being stubborn I added the second can. (The label says min is 30 oz max 36oz)

after the second can was gone - same symptoms Low side 0 . All the while the high side stayed like a rock at 150. So I am guessing that there is a clog. Is it likely to be the expansion valve?

Thanks!

mk378 on Tue April 15, 2008 12:04 PM User is offline

Someone may have put leak stop in it, clogging the expansion valve or the drier. If the outlet line of the drier is cold, there's a restriction in it.

Something still leaks too, since you started at zero pressure.

Expansion valve is inside the evaporator case. You take the case out of the car first to get to it. This is quite simple, it is done by removing the glove box and working thru that opening. No need to remove the entire dash. If you find a bunch of rubbery gunk in it, that's leak stop and you're probably better off replacing the whole system.

brookman on Tue April 15, 2008 1:20 PM User is offlineView users profile

Is there an acceptable way to flush out the stop leak - without buying equipment?

I was planning on replacing the expansion valve and the drier any way. I see on ACkits that the parts as a whole aren't too expensive.

mhamilton on Tue April 15, 2008 6:09 PM User is offlineView users profile

If the stop leak has become solid in the system, then no. It is basically like epoxy, the only repair is to replace everything.

brookman69y2k on Tue April 15, 2008 9:27 PM User is offlineView users profile

that is what I figured! Thanks!

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.