Coolant temperature sensor ????
Thread Starter
Safety Car
Joined: Oct 1999
Posts: 4,679
Likes: 2
From: Honolulu HI
Coolant temperature sensor ????
Does the coolant temperature sensor control the temperature gauge and also send a signal to the ECM for proper engine settings? I have been having trouble with a high idle after warm up. After many suggestions from all of you guys, one of which was the coolant temperature sensor, I noticed tonight that my temperture gauge isn't working. Is this the same sensor? Thanks for any help.
Aloha,
Larry
Aloha,
Larry
Melting Slicks
Joined: Oct 1999
Posts: 2,501
Likes: 177
From: Houston, Texas FEAR THE BONES
2023 C5 of the Year Finalist - Modified
Re: Coolant temperature sensor ???? (Larry Mackey)
I have an LT1, so I don't know how different the sensors are. But on mine, there are 2 coolant sensors -- one in the block and one in the water pump. the one in the water pump controls the digital dash guage, and the one in the block controls the analog guage on the dash and the PCM computer (I think). Anyway, check both sensors and replace if need be (might just replace them both if they are cheap).
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: Coolant temperature sensor ???? (Larry Mackey)
On the L98 the Coolant Temp Sensor is on the front of the intake manifold and sends the coolant temp to the ECM. The gauge is controlled by a sender on the passenger side of the block, between the #6 and #8 cylinders.
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
Re: Coolant temperature sensor ???? (94vette)
I have an LT1, so I don't know how different the sensors are. But on mine, there are 2 coolant sensors -- one in the block and one in the water pump. the one in the water pump controls the digital dash guage, and the one in the block controls the analog guage on the dash and the PCM computer (I think). Anyway, check both sensors and replace if need be (might just replace them both if they are cheap).
Tom Piper
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: Coolant temperature sensor ???? (Tom Piper)
I have an LT1, so I don't know how different the sensors are. But on mine, there are 2 coolant sensors -- one in the block and one in the water pump. the one in the water pump controls the digital dash guage, and the one in the block controls the analog guage on the dash and the PCM computer (I think). Anyway, check both sensors and replace if need be (might just replace them both if they are cheap).
On the LT1, the sensor in the water pump (CTS for Coolant Temperature Sensor), is used for both the ECM/PCM and the digtal dash readout. The sensor in the right side cylinder head is for the analog guage.
Tom Piper
On the LT1, the sensor in the water pump (CTS for Coolant Temperature Sensor), is used for both the ECM/PCM and the digtal dash readout. The sensor in the right side cylinder head is for the analog guage.
Tom Piper
Safety Car
Joined: Mar 2000
Posts: 3,620
Likes: 2
From: Hillsboro OR
Re: Coolant temperature sensor ???? (Larry Mackey)
A good way to spot a bad ECT is to watch the digital temp gauge. If it shows that the engine temp is 80 degrees while the oil temp guage shows 200 or normal operating temp. The ECT is bad or the connection to it is flaky. ECT also controls the fan so if its reading wrong the fans won't come on when they should. Run your AC to kick on one fan if your stuck and have to keep the car running with this problme.
Thread Starter
Safety Car
Joined: Oct 1999
Posts: 4,679
Likes: 2
From: Honolulu HI
Re: Coolant temperature sensor ???? (AquaMetallic94LT1)
Aqua-----,
Evidently there was a dash change in later C4s. My 91 has a gauge but no digital read out. Thanks for the help though.
Larry
Evidently there was a dash change in later C4s. My 91 has a gauge but no digital read out. Thanks for the help though.
Larry
