electrical plug on left head
Thread Starter
2nd Gear
Joined: Nov 2014
Posts: 2
Likes: 0
electrical plug on left head
I have a1987 C4. I am trying to sort out code 33 and 34 issues and noticed a plug on the drivers head between spark plugs that is hanging and melted. The wire to it is green with a white stripe. What is it for? I doubt it has any connection to my low idle but starting with some obvious issues.
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
It's a coolant temp sensor. I'm not sure on your car if the sensor is for the gauge, if it goes to the ECM, or it is a fan switch. I thought it was for the gauge. (not sure) If it is the one that goes to the ECM then it will definitely affect idle quality if it is not hooked up or working properly. Hopefully others will chime in.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
That's the coolant temperature sensor for the auxiliary fan in front of the radiator. The relay for that fan is mounted on the front of the radiator shroud on the driver's side.
You can test the relay/fan by connecting the green/white wire to ground. The relay should click and the fan should run. The ignition does not have to be on to do this test.
You can test the relay/fan by connecting the green/white wire to ground. The relay should click and the fan should run. The ignition does not have to be on to do this test.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
That's the coolant temperature sensor for the auxiliary fan in front of the radiator. The relay for that fan is mounted on the front of the radiator shroud on the driver's side.
You can test the relay/fan by connecting the green/white wire to ground. The relay should click and the fan should run. The ignition does not have to be on to do this test.
You can test the relay/fan by connecting the green/white wire to ground. The relay should click and the fan should run. The ignition does not have to be on to do this test.
Also look under the front bumper facia to make sure the fan is there and if so, that the wire to it is connected. The aux fan relay will be on the forward left side of the radiator shroud.
