A/C Gone and Runnin HOT...Wire Culprit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Starwood · 09-07-2021, 10:08 PM

Hey Fellas -

I recently had to put in a new carb gasket (it was whistling) and during the process, it looks like this wire came loose (in attachments).
I can't seem to find where it was connected - and since I changed that gasket and reset it on intake - no AC - and she was running hotter than hell near 210 on a very quick trip.

It looks like some kind of sensor or relay. Sorry if this is a stupid question, but this 70 is new to me and I've never seen this device on any of my past SBC's....

Please send some advice if ya think this is related and know where this might reconnect.

Thanks Tons

Blue GMC · 09-07-2021, 10:28 PM

I’m not going to be much help but will toss out my .02 cents and bump this for you as well.

Does the wire go in that nub right below your finger in the first pic? Are you running electric fans on your truck and somehow this wire is part of it?

Starwood · 09-07-2021, 10:45 PM

Quote:

Originally Posted by Blue GMC

I’m not going to be much help but will toss out my .02 cents and bump this for you as well.

Does the wire go in that nub right below your finger in the first pic? Are you running electric fans on your truck and somehow this wire is part of it?

Posted via Mobile Device

**Steeveedee** · 09-07-2021, 10:58 PM

Man, you take nice pics, but I can't tell enough from them to give an answer.

**pjmoreland** · 09-08-2021, 12:23 AM

Is that little black box (a relay?) connected to anything other than the black wire that appears to have been connected to it?

tj1970cst · 09-08-2021, 01:15 AM

Did it go to that black cube on the intake bolt? I have seen a similar thing used as a resistor in line with the electric choke

**FirstOwner69** · 09-08-2021, 01:32 AM

This??
https://www.holley.com/products/fuel...s/parts/45-267

tj1970cst · 09-08-2021, 02:58 AM

Yep!

Starwood · 09-08-2021, 07:05 AM

Quote:

Originally Posted by tj1970cst

Did it go to that black cube on the intake bolt? I have seen a similar thing used as a resistor in line with the electric choke

Yes! It has two wires, one is a ground, and they both attach to that cube on the intake.
Posted via Mobile Device

**Rich72C10** · 09-08-2021, 07:12 AM

is that for the choke?

Starwood · 09-08-2021, 07:57 AM

Just looking to see if it might be related to my AC going out and running so hot, but yeah - I think it's just a sensor from a Holley that used to be on the Truck. It has a new Speed Demon carb now.

Time to start digging deeper on the overheating and undercooling issues in other areas I guess.

Thanks all.

body bolt · 09-08-2021, 12:27 PM

This device would have connected to the negative terminal on your electric choke. Is there anything there now?

Starwood · 09-09-2021, 11:13 AM

Electric fan not engaging!

Anybody think this wire may be the missing link? Seems so, as most fans engage off a sensor on the block...just can't see where to reattach! BTW - that sensor has a ground and is connected down on the frame below.

Getting closer I hope. Plz let me thoughts if ya have a sec.

Thx again, Fellas.

**pjmoreland** · 09-09-2021, 11:19 AM

What is that? Is it a wire connection terminal?

09-07-2021, 10:08 PM	#1
Starwood Registered User Join Date: Mar 2019 Location: SAN RAMON Posts: 73	A/C Gone and Runnin HOT...Wire Culprit? Hey Fellas - I recently had to put in a new carb gasket (it was whistling) and during the process, it looks like this wire came loose (in attachments). I can't seem to find where it was connected - and since I changed that gasket and reset it on intake - no AC - and she was running hotter than hell near 210 on a very quick trip. It looks like some kind of sensor or relay. Sorry if this is a stupid question, but this 70 is new to me and I've never seen this device on any of my past SBC's.... Please send some advice if ya think this is related and know where this might reconnect. Thanks Tons Attached Images __________________ 64 C10 Custom 70 C10 Stepside w/67 Front End Clip 1970 Buick Ragtop 2003 Anniversary Road King Classic

09-07-2021, 10:28 PM	#2
Blue GMC Registered User Join Date: Jul 2014 Location: Olathe, KS Posts: 384	Re: A/C Gone and Runnin HOT...Wire Culprit? I’m not going to be much help but will toss out my .02 cents and bump this for you as well. Does the wire go in that nub right below your finger in the first pic? Are you running electric fans on your truck and somehow this wire is part of it?

09-07-2021, 10:58 PM	#4
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,109	Re: A/C Gone and Runnin HOT...Wire Culprit? Man, you take nice pics, but I can't tell enough from them to give an answer. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

09-08-2021, 12:23 AM	#5
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,294	Re: A/C Gone and Runnin HOT...Wire Culprit? Is that little black box (a relay?) connected to anything other than the black wire that appears to have been connected to it?

09-08-2021, 01:15 AM	#6
tj1970cst Registered User Join Date: Mar 2019 Location: Arlington, TN Posts: 170	Re: A/C Gone and Runnin HOT...Wire Culprit? Did it go to that black cube on the intake bolt? I have seen a similar thing used as a resistor in line with the electric choke

09-08-2021, 01:32 AM	#7
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,839	Re: A/C Gone and Runnin HOT...Wire Culprit? This?? https://www.holley.com/products/fuel...s/parts/45-267 Attached Images __________________ Jim

09-08-2021, 02:58 AM	#8
tj1970cst Registered User Join Date: Mar 2019 Location: Arlington, TN Posts: 170	Re: A/C Gone and Runnin HOT...Wire Culprit? Yep!

09-08-2021, 07:12 AM	#10
Rich72C10 Mr. Cheyenne Join Date: Jun 2020 Location: Kyle, Texas Posts: 1,643	Re: A/C Gone and Runnin HOT...Wire Culprit? is that for the choke? __________________ Richard *'72 Chevy C10 Cheyenne Super WHT/MED BRONZE/WHT SBC 350 \| TH350 \| LWB \| AC \| Buddy Seats Upgrades:** Tilt \| Front Sway Bar \| Radio \| Sliding Window \| Bed Spare w/Lock Bed Rails \| Full LEDs \| Courtesy Lights \| Tachometer \| Glovebox Lock & Light \| Head Light Relays \| *Upgraded Fully Super Trim

09-08-2021, 07:57 AM	#11
Starwood Registered User Join Date: Mar 2019 Location: SAN RAMON Posts: 73	Re: A/C Gone and Runnin HOT...Wire Culprit? Just looking to see if it might be related to my AC going out and running so hot, but yeah - I think it's just a sensor from a Holley that used to be on the Truck. It has a new Speed Demon carb now. Time to start digging deeper on the overheating and undercooling issues in other areas I guess. Thanks all. __________________ 64 C10 Custom 70 C10 Stepside w/67 Front End Clip 1970 Buick Ragtop 2003 Anniversary Road King Classic

09-08-2021, 12:27 PM	#12
body bolt Registered User Join Date: Oct 2020 Location: Albuquerque, New Mexico Posts: 475	Re: A/C Gone and Runnin HOT...Wire Culprit? This device would have connected to the negative terminal on your electric choke. Is there anything there now?

09-09-2021, 11:13 AM	#13
Starwood Registered User Join Date: Mar 2019 Location: SAN RAMON Posts: 73	Re: A/C Gone and Runnin HOT...Wire Culprit? Electric fan not engaging! Anybody think this wire may be the missing link? Seems so, as most fans engage off a sensor on the block...just can't see where to reattach! BTW - that sensor has a ground and is connected down on the frame below. Getting closer I hope. Plz let me thoughts if ya have a sec. Thx again, Fellas. __________________ 64 C10 Custom 70 C10 Stepside w/67 Front End Clip 1970 Buick Ragtop 2003 Anniversary Road King Classic

09-09-2021, 11:19 AM	#14
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,294	Re: A/C Gone and Runnin HOT...Wire Culprit? What is that? Is it a wire connection terminal? Attached Images



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