were oh were

John ED Renstrom

John ED Renstrom

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getting back to gather with this 69. I took it all apart and as I'm putting it back together I'm coming up with a few loose ends. we figured out the green wire goes to a temp sensor that sits under the AC. I'll study up on that one to see what it is supposed to do. but I can't guess where this vacuum hose with the green tracer goes. it's a big one. they had a number of splices in the lines that were not to be. so we eliminated that. now this 5/16 hose with the green tracer goes into the fire wall. up behind the defroster duct. it's open right now with everything off. it's not pictured in the heater AC vacuum diagram. so anyone have any Ida were it may go. my 68 is way different set up then the 69. so no help there. the hardest part of these cars is putting back what some one else did.
 

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This is a picture of my 1969 M&M, hopefully this may help.
69vacume027.jpg


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My '70 have the same suction tube, I asked the question last year because I didnt knew what was the valve for. the valve is just on the back of the attendant seat and the tubing pass under the passenger seat.
 
OK thanks Bruce. so were does the green tracer small one that's on that diaphragm GO?? the white trace we see in your pictures spliced in the newer goes to the carburetor choke pull off. they had this bigger green tracer in the back of the carburetor. it would make sense if it is to go on the purge valve as it is to be open when things are off. and this line is open right now. I'll have to get inside and see were it hooked up. the purge valve is to be T to a solenoid the other side runs the defroster valve. you got to tear half the dash out to get to it and I was hoping to not have to do that. but it would fit there. the small one was on there when I tore it apart so we just left it there. do you have a black wire going to a sensor on the right head just behind the alternator. at 2:00 to the first spark plug
 

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There are 2 green hoses one to the purge door unit and one to the defrost bleed unit. They are both hooked to the vacuum solenoid. I still have my 69 shop manual if you need anything else.
 
The sensor is a temp sensor for the automatic climate control. It has one black wire going to it. This sensor would only be there if the car is so equipped. I can look at the hose routing. I tried to call you yesterday while I was standing by the car. I can take more pics. I try and call you when I'm there today.
 
John ED Renstrom said:
getting back to gather with this 69. I took it all apart and as I'm putting it back together I'm coming up with a few loose ends. we figured out the green wire goes to a temp sensor that sits under the AC. I'll study up on that one to see what it is supposed to do. but I can't guess where this vacuum hose with the green tracer goes. it's a big one. they had a number of splices in the lines that were not to be. so we eliminated that. now this 5/16 hose with the green tracer goes into the fire wall. up behind the defroster duct. it's open right now with everything off. it's not pictured in the heater AC vacuum diagram. so anyone have any Ida were it may go. my 68 is way different set up then the 69. so no help there. the hardest part of these cars is putting back what some one else did.
Click to expand...

Just stick a screw in it Ed! :clap:
 
I will have to see if it has vacuum first before I waste a screw. the vacuum switch is dead center under the dash on top of the defroster hoses and the car fuse box. we have the other small green tracer going to the defroster valve that was why I was guessing the small one to the purge was correct. but I'll take more stuff off and see. some one could have changed hoses some time in it's life and the big one is now just ridding alone .
 
dug down and found the valve in question and Bruce has steered me correctly. the dark green strip goes on there. they had the light green line that comes up from the neutral safety switch on the purge door. i know it goes out into the engine room. the black one is hooked up to vacuum. red to park brake and white to the choke pull off. any one know were or what the light green one hooks up to? like I said the hardest part is getting what someone else did back the way GM made it. we have the book all it says is put the vacuum lines back the way they were. not a lot of help there .
 

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The Light green goes to lowest port on the thermostatically controlled vacuum switch located to the left of the distributor (picture 3). the light green hose gets steeped up to a larger vacuum hose before getting to vacuum port next to the distributor. The white stripe hose coming from the same bulk head connector goes to the rear choke pull off on the carburetor. The other larger diameter hose that comes through the same bulkhead connector goes to the top side port of the vacuum check/junction jut below the ATC programmer on the fire wall (pictures 1 &2)

picture 1
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picture 2
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picture 3
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interesting so this is why you need the 69 neutral safety switch. they routed the vacuum advance and the smog pump vacuum threw the neutral safety. it's safe to assume that the dump port is open and the distributer retarded while in park or neutral. so lower left front port on the carburetor on your 69 is plugged?? on this one they plug the distributor into the left lower port on the carburetor. removed the temperature vacuum port. put the mechanical temp gage there. then removed the sending unit under the AC compressor for the light. disconnected and tossed away half the smog pump. unhooked the choke pull off (white line), plugged it into the vacuum manifold on the fire wall. T the line for the transmission modulator with the main vacuum line going to it. plugged the dark green line into the top port on the rear of the carburetor. plugged the light green on into the purge valve. just this mistake would allow most of the heated/cooled air to go to the out side rather then in.

we now have the heater/AC lines going right. understand were the safety switch lines go. only two more question. I plugged the transmission modulator into the top port on the rear of the carburetor. was this correct? and what did they do with the front lower left port on the carburetor. I was guessing the heated vacuum switch got it's vacuum there. but if it gets it with the light green line does that port do anything??
 
so right now we are stuck with Danny's fix. the temperature activated vacuum switch is not available to buy and you have to pull the distributor to put it in. so we will pass that on to a better mechanic then me. he can do it when he finds one. mean time we know were it is to go and what it needs to be factory correct. we'll use the timed port out of the carb to do the advance and the dump valve on the smog pump.
 

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Napa would have to look it up as a Ported Vacuum Switch. I was able to get one for my 68 T-Bird this summer. Also have them look under a Thermo Vacuum Switch. advance auto has the 4 port available in stock so Im sure NAPA can get one in a three port.
 
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