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1970 B Body A/C #2149159 09/06/16 09:29 PM 09/06/16 09:29 PM
Joined: Feb 2007 Posts: 30 Florida T Turbo383 OP member
Turbo383 OP member T Joined: Feb 2007 Posts: 30 Florida	Hi Everyone, I have a recently restored '70 road runner w/ factory air. The A/C works in all normal positions, but when I push MAX A/C, the blower shuts down. I noticed however, that when I push the HEAT button, the A/C compressor comes on. I seem to have everything wired correctly(?). Maybe a bad switch? Any help would be greatly appreciated... Thanks!

Re: 1970 B Body A/C [Re: Turbo383] #2149424 09/07/16 09:52 AM 09/07/16 09:52 AM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Could be, it's plastic that is basically glued together and it WILL fail eventually. Hopefully it's available aftermarket, otherwise $$$$ . running up my post count some more .

Re: 1970 B Body A/C [Re: Turbo383] #2149472 09/07/16 11:29 AM 09/07/16 11:29 AM
Joined: Apr 2007 Posts: 2,917 Calgary, Alberta Canada a12rag master
a12rag master Joined: Apr 2007 Posts: 2,917 Calgary, Alberta Canada	Do you have factory service manual ??? My 70 Sport Satellite is factory a/c and found the fsm, best source for trouble shooting. Perhaps you may have something wired incorrectly because in heat position, the a/c compressor should not be coming on. In def position it does, but not in heat. Also make sure the control is for 70 model year, the part number has been superseded several times over the year, and functionality changed . . . at least that is what I have found . . . good luck

Re: 1970 B Body A/C [Re: Turbo383] #2149586 09/07/16 01:46 PM 09/07/16 01:46 PM
Joined: Jun 2005 Posts: 665 NY twodoorpost mopar
twodoorpost mopar Joined: Jun 2005 Posts: 665 NY	Probably the wrong switch as they are not all the same. You most likely have the C body # 3502126 installed. Your application calls for # 3431020.

Re: 1970 B Body A/C [Re: Turbo383] #2150159 09/08/16 03:13 AM 09/08/16 03:13 AM
Joined: Feb 2007 Posts: 30 Florida T Turbo383 OP member
Turbo383 OP member T Joined: Feb 2007 Posts: 30 Florida	Thanks guys! I do have the FSM, BUT perhaps not gone through it enough. I will definitely checkout the part number as well as verify that the compressor is on in defrost mode. (We rarely use defrost as the a/c helps keep the windows clear....)

Re: 1970 B Body A/C [Re: Turbo383] #2150353 09/08/16 02:02 PM 09/08/16 02:02 PM
Joined: Jun 2005 Posts: 665 NY twodoorpost mopar
twodoorpost mopar Joined: Jun 2005 Posts: 665 NY	If you want to turn the compressor to turn on in the defrost position, then you need switch # 3895790, which is a later switch.

Re: 1970 B Body A/C [Re: twodoorpost] #2150375 09/08/16 02:32 PM 09/08/16 02:32 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Originally Posted By twodoorpost If you want to turn the compressor to turn on in the defrost position, then you need switch # 3895790, which is a later switch. Standard Brands HS-101 about $50 at RockAuto. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

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