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#1
12-12-2017, 02:10 PM
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Lost voltage to compressor
Hi, I no longer get 12v to my a/c compressor on my 70. System is all original and has been working fine until now. Fuse in fuse box under dash is fine, all fan speeds work, and if I jump 12v to the compressor it works fine. So for some reason the compressor no longer getting voltage from the harness.
No sign of mice either. I just dont know if there is a relay or something else between the dash controls and the compressor.
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 68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph 70 Lemans, 350/350, A/C, mostly stock 14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd 97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold*** |
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#2
12-12-2017, 08:38 PM
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There should be a fuse at the alternator for the compressor.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
12-13-2017, 08:44 AM
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Check the ambient temp sensor located on the top of the cowl.
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#4
12-13-2017, 10:39 AM
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What he ^^^ Kenman said.
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#5
12-15-2017, 04:04 PM
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Ok, should have some time this w/e to investigate. About the fuse, I am aware of the hi speed fan fuse in that location but not for the compressor. I will look for the ambient temp sensor but I am not aware of any such sensor on a 70. What am I looking for exactly and how to check it?
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph 70 Lemans, 350/350, A/C, mostly stock 14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd 97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold*** |
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#6
12-15-2017, 07:31 PM
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70 AC Fuse
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#7
12-26-2017, 11:46 AM
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Quote:
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1971 Pontiac GT-37 Car is a junk yard dog and maybe one day will be restored. 
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#8
12-26-2017, 01:06 PM
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Guys, thank you for all the replys. Unfortunately I haven't been able to get back to this yet, (arrgg, short daylight hrs and too much work). I did follow the compressor's 12v lead from the compressor back to the harness at the firewall, no fuses present just a harness to harness connection. A picture would be worth a thousand words to identify any of the components suggested in this thread. Merry Christmas!
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph 70 Lemans, 350/350, A/C, mostly stock 14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd 97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold*** |
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#9
01-02-2018, 12:14 PM
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I found the sensor on the cowl. Sensor has no voltage either except when I hot wire the compressor. So, sensor is probably not the problem. Hate to work blind but took a leap of faith thinking its most likely the dash switch. Sprayed a couple of quick shots of qd electronics cleaner in the slot where the switch arm comes through the face of the control panel, flipped it a few times and bingo! 12v to the compressor!
__________________
68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph 70 Lemans, 350/350, A/C, mostly stock 14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd 97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold*** |
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#10
01-02-2018, 12:36 PM
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COOL!
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#11
01-02-2018, 01:13 PM
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Thank you John!
__________________
68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph 70 Lemans, 350/350, A/C, mostly stock 14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd 97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold*** |
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