ACDelco GM Original Equipment 213-77 Engine Coolant Temperature Sensor

From a frequently rough idle in an old TPI 350 to a consistently smooth one - in about two minutes. What's not to like?

Temperature gauge reading low? It was in my 1994 5.7L TBI K1500. Replaced temp sender located between spark plugs @ cylinders 1 and 3 on driver side cylinder head. The gauge now functions properly again.

My original Coolant Temperature Sensor seemed to be reading high. Used an IR gun to confirm. Mechanic suggested replacing was a good first step versus him troubleshooting and costing time and money troubleshooting. He indicated that over time the resistance changes and causes the reading to be off. Of course it could be other things, but with the IR gun confirming a reading difference, I took the plunge. The most difficult thing was getting the plug on the end of the sensor off without breaking it. I had previously changed the alternator and the clip broke with very little pressure, so I had to splice in a new clip. I changed the sensor with the coolant still in the engine, just protected the exhaust manifold and quickly made the exchange. Cleaned up anything that spilled, reconnected and started up the engine. I let it cycle a couple of times before taking it out on the road. So far it seems to be reading with in the range of the IR reading, so happy so far.

Tried a couple store brand ones from all of the parts stores ones and I had no end of trouble with them either not reading at all or reading about 10%-ish too high. As I understand it the latter is because of different resistance values that the Gen 1 SBCs used to show temperature readings since they didn't run as hot, so I decided to just get the one with the exact ACDelco part number and this one works correctly and correlates pretty close to the digital reading that the PCM uses off of the water pump.

Estoy satisfecho con la mayoría de mis pedidos, exepto el sensor q era de entrada mas grande la rosca y el ventilador solar q solo trabajo 20 minutos y se terminó, no funciona, creo recibiste reembolso del sensor pero venía en bolsita de plástico, y hoy como la regreso? Pero s pesar de estos pequeños problemas no alteran lo bien contento q estoy en estos años con Amazon, gracias.

My gauge in the dash stopped working in my 93 S10 with a 2.8L V6. After unhooking the single wire harness from the old sensor I noticed the plug on the sensor was cracked. I tested the gauge in the dash buy grounding the only green wire running to this sensor to the engine block and checking the gauge and it was maxed out verifying the harness, wire, and gauge worked. I ordered this and used a 13/16 spark plug socket to remove the old one and immediately install this one. I only lost a little fluid. Plugged right in and the gauge is now back to working. You should only install this while the engine is cold. Also, the s10 2.8L has two temp sensors, one for the Guage this one and one for the ECU that's a two wire on the top of the motor. This one on the 2.8L is on the driver side above the power steering pump. I used a 13/16 1/4" driver with an 8" extension and it came right out.

There’s nothing wrong with the sensor, and it does fit and plug in. But apparently GM used a different resistance in the 1994 Chevy trucks with a 4.3l V6. The sensor works, the gauge works. But it reads very low. Like 110-120° instead of the 190-200° that the water temp really is. Very annoying for me, but nothing inherently wrong with the sensor.

Parts store kept giving me the two wire ecm sensor that you find on the top of intake. Look the same but are not. I needed the gauge only single wire sensor that most typically find on driver side head. Sensor can go in aftermarket intake but wanted it to be where it should be for next buyer. Did a 350 swap and used a reducer type insert to get the right threads for the heads... Finally all my gauges working. Way cheaper than local jokers.1995 OBS CHEVY GAUGE ONLY SINGLE WIRE SENSOR. 👍