Jingkun

iTrader: (4)

Loving this texas heat. I'm sure I'm in for a newer blower motor just to bring my ac back to life, but I was wondering if anyone has tried experiementing with other motor like maybe one found in a van to push more air harder?

dantheman

iTrader: (4)

The issue you will have is the system not being able to cool the air fast enough. We have a crappy condenser, weak compressor and just an old design all over. I am fighting to get mine colder then the high 50s right now. I am wondering if it can be done in Texas.

Jingkun

iTrader: (4)

I've been looking into alot of stuff as of recent. My vent temps at night are in the mid to upper 50s. I've been pulling alot from here https://www.rx7club.com/showthread.p...8&highlight=ac
as for condenser I've been thinking about trying to retro fit one from a 90s impreza, since my friend says I can have the one out of his junk car. Thinking about just stealing the whole system to try and retro fit from this r12 setup to a native synthetic setup.

Scott1982

Texas is going to really test this system...

Make sure all of your ducts are really joined together (blower to evap, evap to heater core assembly) properly. It really is a "cheap" design with some room for improvement using really crummy clamps. I fixed the connections and then put really good duct tape on them.

And the link posted (in Jingkuns post) in the archive section has some really good data on alternatives to R12. I can't provide first hand feedback on the alternatives but R134 did not cut it for me in New York so "suspect" it won't cut it in Texas!

https://www.rx7club.com/showthread.p...8&highlight=ac


Scott

dantheman

iTrader: (4)

I just refilled mine this past weekend with r152. Now sitting in the upper 50s. Much better then the mid 70s that i-12 was giving me. I will take a look at the vents. I bet I can fix those a good bit now that you mention it.

Jingkun

iTrader: (4)

Real quick, does anyone know what that rubber hose goes to that comes up from the carpet and plugs into the fan housing? I'm all set to do this conversion to 152a, I just need to find a day to do it. When I do that I'll probably disassemble the housing down there, clean and reseal everything, anything I should really pay attention to? Also noted that the write up I'm using is referencing the FC and not our FBs so I'm curious if 20oz of 152a is too much for our cars considering I keep hearing about how small and inadequate our ac systems are.

dantheman

iTrader: (4)

I put in 18ish. Its a 56% ratio r12 to r152 and I found rumors that we have a 28oz system. That gives you a charge of 15.6oz. I put in 18 and expected some loss due to purging the tubes and such.

O, and I think the tube is a condensation drain.

Jingkun

iTrader: (4)

Condensation drain eh? Makes sense, I just don't get why my ac never blows cold if someone kicks it out by accident <.< Probably has nothing to do with the drain and just that I need to reseal everything. Well my dryer came in today and new blower motor yesterday so with that I just need to go nab that vac from autozone and I'm set to do my ac this weekend.

rx7lives

You're right about the vents! I duct taped all of the A/C ones and the one between the driver's legs is the worst. After taping, air flow is much improved.

However, as someone said, if you have your fan on high, the A/C even in tip top shape can't keep up and I've found you're actually better off running the fan on the second highest position and I have a correctly setup (new dryer, vacuum pumped down for a half hour, little can of oil and R-12 and using good old r-12 as coolant). I dread running out but you can always get cans off of Craigslist for around $20 $25 each. As the guy said that was servicing my home system, nothing blows colder than R-12.

Would it make a difference to run an FC condenser?

Does anyone know where the bottleneck is, condenser, compressor, evaporator, expansion valve????

Jingkun

iTrader: (4)

Post 2 basically states it flat out, crappy condenser and weak compressor.
I'm probably gonna pull all this stuff out of my buddy's impreza shell and hope for the best.
Just curious about what I'm actually going to do if the lines don't match up. Hmm maybe I should grab his radiator too... so many choices.

dantheman

iTrader: (4)

Let us know how it fits!

I was looking at all the ducting in my car and found a huge number of gaps. The biggest was a good 1/4" gap between the evaporator box and the ducting! Gotta fix that stuff tonight.

Jingkun

iTrader: (4)

I'm passing on the impreza stuff for now. Just gonna try it once with the stock stuff and maybe I'll go for a retro fit once I pull the stuff off the impreza. Not like it'll be hard to replace 11 bucks in 152a lol. My problem is trying to figure out which side is the high side and which is the low on the stock compressor since both fittings are on the compressor. That write up I posted up top says to attach the low side of the manifold to the dryer but there is no way of doing that so i'm assuming that his low side bung was actually on the dryer. Anyone got any ideas? I'm thinking high side on the left closest to the strut tower and the low side would be on the far side of the compressor.

Jingkun

iTrader: (4)

For the record this is the compressor I have in my 83. The pulley and front of the car are up so left and right are driver and passenger sides respectively. Thanks for any help anyone can give on this matter.

dantheman

iTrader: (4)

The s ad d stand for suction and discharge respectively. The S is the low side.

Jingkun

iTrader: (4)

Thanks for that. Good news is that it blows cold, bad news is that I still can't feel the fan blowing very hard. I also know I'm under charged because the compressor was stalling.