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Yes, that won't work. Get the up-graded 134 hoses (not the new car type with quick disconnect, but the old car conversion type) first off, then they usually come with 45 degree fittings, they self seal. Just serviced my 78 with R12 yesterday. Good luck, your local auto supply should have them as well.
Thanks for your reply. I have a manifold set. but all its ends are 90 degrees. They also won't work. I'll try to track down a 45. In the meantime, I see two more service ports near the evaporator. One is definitely the high side, but the other looks like it may be a second low side port. Can I tap into this port?
That end or the refer hose should be connected to the manifold. The other end of that hose should have should have a 45 deg. swivel end on it and should not be a problem connecting to the suction or low side fitting. That system is R12 unless they did not change the fittings for 134A. If there is a fitting on the larger suction line that is accessible you can use that. Roger
Thanks for your reply. I have a manifold set. but all its ends are 90 degrees. They also won't work. I'll try to track down a 45. In the meantime, I see two more service ports near the evaporator. One is definitely the high side, but the other looks like it may be a second low side port. Can I tap into this port?
I do not have a low side service port on mine. Just a high side that you can evacuate and service with R12. That fitting however is smaller than the low side fitting and will need an adapter for your high side hose. It can be done but needs to be filled with the engine off.
If after servicing the pressures are off or it doesn't get cold, your orifice tube might be plugged. That is located in the high side pipe where the nut is in the picture (aligned with the "cold" marking on the coolant tank). Separate the pipe and it's the plastic thing inside the pipe. You need a special puller but if you are skilled and lucky it can be pulled with needle nose pliers. Put some refrigerant oil in the pipe to lube the oring or it will break off inside the pipe and then will be a bitch to pull the remainder of the guts. Good luck!
You could remove the bolt above the service port till you get your business done, no biggie.
Thank you. I took your suggestion and removed the bolt. Since it's a belt tensioning bolt, I clamped a pair of vice grips on the compressor bracket to prevent the running compressor (during the charge) from moving and possibly throwing the belt.
