Temperature sender and TCS Temp HELP
Thread Starter
Instructor
Joined: Jul 2001
Posts: 137
Likes: 0
Temperature sender and TCS Temp HELP
My 71 Lt-1 has a temperature sender on the drivers side cylinder head. The sender has a "thumbtack" style connector. A green lead from the engine harness connects to this sender.
The right hand (passenger side) cylinder head, around cylinder #6 has a plug. It appears as though this should have another solenoid or sender in it. Perhaps a TSC temperature sender? A green lead is hanging from the firewall.
My question is twofold. Is the temperature sender on the drivers side correct in having the "thumbtack" style connector? I was told that the drivers side temperature sender should be a dual blade type connector. Secondly, what belongs in the plug on the passengers side engine cylinder head? I found a TCS jumper harness in my parts boxes. It has a single blade and dual blade connector system on a green lead. Where does this belong.
Any help would be greatly appreciated.
The right hand (passenger side) cylinder head, around cylinder #6 has a plug. It appears as though this should have another solenoid or sender in it. Perhaps a TSC temperature sender? A green lead is hanging from the firewall.
My question is twofold. Is the temperature sender on the drivers side correct in having the "thumbtack" style connector? I was told that the drivers side temperature sender should be a dual blade type connector. Secondly, what belongs in the plug on the passengers side engine cylinder head? I found a TCS jumper harness in my parts boxes. It has a single blade and dual blade connector system on a green lead. Where does this belong.
Any help would be greatly appreciated.
Burning Brakes
Joined: Jan 2001
Posts: 1,004
Likes: 16
From: Gainesville, Florida
Re: Temperature sender and TCS Temp HELP (mulchie)
My '70 has the thumbtach sender on driver side head and its for the water temp gauge and I believe it is correct.
As you mentioned, the passenger side head should have the TCS dual blade sender instead of a plug. The dual blade connector/harness connects to it. One of the poles on the sender goes to a sender on the transmission (single post type connector) located on the driver side toward the front of the tranny (look just to the rear of the bottom bellhousing bolt). The other goes to a TCS switch somewhere (shown by the wiring diagram) in the engine compartment.
Mine is disconnected so I'm providing as much as I know. Hopefully someone else can fill in the gaps.
Mark
[Modified by mdsmith, 12:10 AM 8/29/2001]
As you mentioned, the passenger side head should have the TCS dual blade sender instead of a plug. The dual blade connector/harness connects to it. One of the poles on the sender goes to a sender on the transmission (single post type connector) located on the driver side toward the front of the tranny (look just to the rear of the bottom bellhousing bolt). The other goes to a TCS switch somewhere (shown by the wiring diagram) in the engine compartment.
Mine is disconnected so I'm providing as much as I know. Hopefully someone else can fill in the gaps.
Mark
[Modified by mdsmith, 12:10 AM 8/29/2001]
Le Mans Master
Joined: Oct 2000
Posts: 6,209
Likes: 33
From: Texas-out west
Re: Temperature sender and TCS Temp HELP (mdsmith)
The other wires from firewall go to a tcs solenoid which bolts to the pass side on the intake manifold, has vac fitting to go to dist, carb and smog pump.
Thread Starter
Instructor
Joined: Jul 2001
Posts: 137
Likes: 0
Re: Temperature sender and TCS Temp HELP (LT1driver)
The TCS solenoid on the passenger side (intake manifold) is on 70 and 72 only. It is not present on 71's (in 71 is combined on the CEC module-mounted on the drivers side of the carb).
The connector hanging on the pass side firewall is single blade (green wire). If the pass side tcs temp solenoid is a dual blade type, then perhaps the tcs jumper harness runs from the solenoid to the single blade connector on the firewall.
Anyone else confirm the "correctness" of the thumbtack style water temp sender unit on the driver's side. Thanks
The connector hanging on the pass side firewall is single blade (green wire). If the pass side tcs temp solenoid is a dual blade type, then perhaps the tcs jumper harness runs from the solenoid to the single blade connector on the firewall.
Anyone else confirm the "correctness" of the thumbtack style water temp sender unit on the driver's side. Thanks
Melting Slicks
Joined: May 1999
Posts: 2,897
Likes: 0
From: Moon Township PA
Re: Temperature sender and TCS Temp HELP (mulchie)
This is a correct statement regarding the CEC in 71 only. I had problems with a non-working TCS system and I referenced the 72 GM Chassis Service Manual which has a troubleshooting guide. I would suspeect that a 71 Chassis Service Manual will give you the information you need for your car. In addition, it will have a proper schematic to see what these wires are for. I can tell you that if you had a 72 you would have a temperature sending unit in the left head and a TCS temperature sending unit in the right head, with a two lead connector.
Gary
Gary
