'80' temp. switch ??
Thread Starter
Racer
Joined: Apr 2001
Posts: 269
Likes: 0
From: Golden Colo.
'80' temp. switch ??
Does anybody know where the temp. switch is located for the converter lock-up. Its supposed to make at 130*F. on coolent temp. thus allowing the converter lock-up as long as several other conditions are meet. My problem is not the lock-up working its trying to find the da-m temp. switch.
I've spent hrs. going over the engine and thru the repair manual searching for this. It's mentioned but no location is given. The reason for the search is that I would like to know where everything is located and what it's function is before the heads are removed and new ones put on. Any help would be most appreciated.
This is a 80 with a 350-C trans.
I've spent hrs. going over the engine and thru the repair manual searching for this. It's mentioned but no location is given. The reason for the search is that I would like to know where everything is located and what it's function is before the heads are removed and new ones put on. Any help would be most appreciated.
This is a 80 with a 350-C trans.
Melting Slicks
Joined: Aug 2001
Posts: 3,046
Likes: 124
From: Wichita KS
Re: '80' temp. switch ?? (82zoom)
82zoom,
I believe it is one of the two Thermostatic Vacuum Switchs (TVS) installed in the thermostat housing of the engine. On my 1980 there are two TVSs on the thermostat housing, one black and one purple. I believe the transmission TVS is the purple one. (I would also bet that your TVSs are not these colors)
The A.I.M. for 1980 page 8D sheet 1 shows the trans control vacuum switch "Y" connected along with the vapor canister. These inturn APPEAR to be "Y" connected to the temperature vacuum switch that controls the EFE and diverter valve on the A.I.R pump. (A.I.M. page 6L sheet 2)
HOWEVER
The line drawings in the A.I.M. are not all that clear. And it does not make sense that the Early Fuel Evaporation (EFE) system and the transmission lockup could be controlled off the same TVS. The EFE TVS would send vacuum to the passenger side actuator for the exhaust heat valve when the engine was cold. A Transmission TVS would send vacuum to the switch when the engine was warm.
I am in a rebuild process and all this stuff is off the engine. The black TVS that I have marked Exhaust Heat Valve is free flowing (cold). The purple TVS (a bubba disconnect when I got the car) is unmarked but allows no airflow (cold). Anyway, I think it is the one that does not have airflow when cold.
Good question, I needed to find out myself. In any case, my level of confusion is now on a much higher plane.
:lol:
I believe it is one of the two Thermostatic Vacuum Switchs (TVS) installed in the thermostat housing of the engine. On my 1980 there are two TVSs on the thermostat housing, one black and one purple. I believe the transmission TVS is the purple one. (I would also bet that your TVSs are not these colors)
The A.I.M. for 1980 page 8D sheet 1 shows the trans control vacuum switch "Y" connected along with the vapor canister. These inturn APPEAR to be "Y" connected to the temperature vacuum switch that controls the EFE and diverter valve on the A.I.R pump. (A.I.M. page 6L sheet 2)
HOWEVER
The line drawings in the A.I.M. are not all that clear. And it does not make sense that the Early Fuel Evaporation (EFE) system and the transmission lockup could be controlled off the same TVS. The EFE TVS would send vacuum to the passenger side actuator for the exhaust heat valve when the engine was cold. A Transmission TVS would send vacuum to the switch when the engine was warm.
I am in a rebuild process and all this stuff is off the engine. The black TVS that I have marked Exhaust Heat Valve is free flowing (cold). The purple TVS (a bubba disconnect when I got the car) is unmarked but allows no airflow (cold). Anyway, I think it is the one that does not have airflow when cold.
Good question, I needed to find out myself. In any case, my level of confusion is now on a much higher plane.
:lol:
Team Owner
Joined: May 2001
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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St. Jude Donor '06-'10, '13
Re: '80' temp. switch ?? (mapman)
I ditched all my TVS crap when I swaped motors. I just hook it up to a reg. vacuum source. Or course that means you cen get lockup before the engine is warm, but in Arizona, the engine is over 130 before you get a chance to get out of the neighborhood and make it up to 40 mph.
Thread Starter
Racer
Joined: Apr 2001
Posts: 269
Likes: 0
From: Golden Colo.
Re: '80' temp. switch ?? (82zoom)
mapman,
Thanks for the info. and memory jog. Thats exactly whats its for and where its located. I don't know how I could have missed it. I by-passed the vac. line for the EFE quite a while back [2 yrs.] because of a diaphram leak but kept the switch in service for the lock-up. :eek:
Thanks for the info. and memory jog. Thats exactly whats its for and where its located. I don't know how I could have missed it. I by-passed the vac. line for the EFE quite a while back [2 yrs.] because of a diaphram leak but kept the switch in service for the lock-up. :eek:
