Cooling System Issue
Thread Starter
Instructor
Joined: Jun 2004
Posts: 121
Likes: 0
From: Snatch BC
Cooling System Issue
I have replaced the Electric Fan on my 86 Corvette, but it's still not always coming on when it should. Could it be a bad Relay, Coolant Tempreture Sensor or some other Sensor, Relay or Wiring.
Car randomly Overheating due to Fan not coming on.
I have tried the bypass trick listed in the Repair Manual and the fan seems to be fine.
Car randomly Overheating due to Fan not coming on.
I have tried the bypass trick listed in the Repair Manual and the fan seems to be fine.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
The fan relay is operated by the ECM which gets coolant temp info from the temp sender on the front of the engine under the MAF. Normally the fan comes on at 228 F and goes off at 210 F.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
The fan comes on at different temps depending on whether your A/C is on o not.
A/C off, fan should come on at 232 degrees, and go off at 215 degrees.
AC on, fan should come on at 225 and off at 212 degrees.
I have an 86, and it has always done that since I got it almost 15 years ago.
If your fan is intermittant, try changing the fan relay or removing the connector on the fan relay and inspecting it for overheated terminals. That was the problem with my car when I got it.
I fixed the fan relay connector and it's worked perfect since.
A/C off, fan should come on at 232 degrees, and go off at 215 degrees.
AC on, fan should come on at 225 and off at 212 degrees.
I have an 86, and it has always done that since I got it almost 15 years ago.
If your fan is intermittant, try changing the fan relay or removing the connector on the fan relay and inspecting it for overheated terminals. That was the problem with my car when I got it.
I fixed the fan relay connector and it's worked perfect since.
