I was wondering were can I put freon on my ac line idk if its the one behind the intake manifold or the one its on the exhaust there is 2 of them can anyone help I have the 87 rx7 13b

 

That depends on if your car has been converted to r134a or not. The low pressure side is the line higher in comparison to the other. That's where you would put it in at IF its been converted.

 

A/C seems to be the one area of RX7s that isn't sufficiently/properly documented, so there is a lot of misinformation floating around as a result. Add in more than one manufacturer and it quickly becomes a mess that intimidates most people.

If your A/C system is unmolested, you would add R12 to the Low Pressure service port on the firewall near the Upper Intake Manifold (UIM for short). The High Pressure service port is on the passenger side between the exhaust manifold and strut tower.

This information applies to SANDEN A/C systems only. If your car has a NipponDenso system, it may be slightly different. The easy way to tell the difference between the two is to look at the compressor. If the hoses attach to the top (near the rear of it, but facing vertical)) using a single bolt, it is a Sanden system. If the hoses have individual fittings and face the rear, it is a NipponDenso system. 89+ Sanden cars are slightly different in that both hoses each have a bolt to secure them to the compressor.

If you're still having trouble locating the service ports, follow the bigger hose from the compressor and you will find the low pressure port. As for the high pressure port, follow the smaller hose past the condenser and receiver/drier (canister device plumbed to condenser) and you will find it.

 

Even the old R12 systems still filled from the low pressure side.

Just say'n

"That depends on if your car has been converted to r134a or not. The low pressure side is the line higher in comparison to the other. That's where you would put it in at IF its been converted."

 

I said if just because of the availability and price of r12

 

R12 is highly illegal in Canada. Once an AC system is drained it HAS to be retrofitted to R134a.

 

i still need to look at my car but fixing my ac is on my list of things to do haha

 

Cars manufactured after 1993 were required to use 134a refrigerant instead of R12 freon.

There are a lot of problems with even acquiring R12. Lots of counterfeit gas is being sold as R12 and turns out to actually be propane!

R12 is no longer even being made. All of it that is still available is from recycled stock.

The Mazda dealer here in La Crosse, WI says they can do a retro conversion to 134a on my '91 vert for less than $200 USD. So I will do that rather than try to find legit R12 recharge when my air stops blowing frosty.

There are conversion kits available, but I don't know how good they are. And you have to find a way to capture and dispose of your remaining R12.

 

I think this thread will peak your interest. https://www.rx7club.com/2nd-generati...gerant-964688/

 

Thanks Monty, it does indeed.

 

No worries.