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Author Topic: 1972 A/C Problem  (Read 887 times)

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Offline 1972 Wagon

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1972 A/C Problem
« on: August 02, 2017, 03:17:29 PM »
Last year when I had my Pinto "brought" back to life, my mechanic checked the A/C. Amazingly, even after sitting for several years, the A/C was still fully charged with Freon R-12. The A/C runs fine and blows cold air out of the two vents. Now, here is the problem. The unit will run fine for about 15 minutes and then the 30 amp fuse will melt. Not blow, melt. The ends of the fuse look like they were touched by a soldering gun. The blower runs fine on the vent and defrost settings. There is no meltdown until the A/C is switched on and runs for 15 minutes. Any ideas of what I can check? Remember, unlike many of you, I am not mechanically gifted but I can check for loose connections, etc. Thanks to Pinto_one's step-by-step instructions, I have learned how to remove the speedometer cable, check the fuel sending unit, find the dash brake light's loose connection, and replace the gas gauge, so I can do some simple repairs. I appreciate any suggestions.
*The Original Family Car: A 1972 Pinto Wagon*
Ordered by my folks from Bunnell Motor Company, Inc., Bunnell, Florida
Delivered: June 20, 1972
Entrusted to my care: August 1976

Offline 65ShelbyClone

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Re: 1972 A/C Problem
« Reply #1 on: August 03, 2017, 06:43:58 PM »
It sounds like maybe the fuse holder is not making good contact with the fuse.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
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Offline dick1172762

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Re: 1972 A/C Problem
« Reply #2 on: August 06, 2017, 04:19:02 PM »
That is VERY strange as the fuse should have blown way before the end of the fuse melted. Juice flowing thru the fuse should not be able to melt a fuse.
Its better to be a has-been, than a never was.

Offline 1972 Wagon

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Re: 1972 A/C Problem
« Reply #3 on: August 08, 2017, 12:53:29 PM »
The fact that the fuse melted is what perplexed me. The fuse is a 30 AMP which is the correct size. If I run just the blower there is no problem. It is only when I switch on the A/C and even then it takes about 15 minutes for the fuse to blow. Prior to the fuse that melted, the fuses had always just blown. If I remember correctly from many years ago, when the A/C fuse issue first started, we had to replace the blower switch.
*The Original Family Car: A 1972 Pinto Wagon*
Ordered by my folks from Bunnell Motor Company, Inc., Bunnell, Florida
Delivered: June 20, 1972
Entrusted to my care: August 1976