Fan switch problem....
#1
Junior Member
Thread Starter
Join Date: Oct 2010
Location: Southern California
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc
Engine: 305 TPI
Transmission: 700R
Fan switch problem....
My car started overheating so I decided to take it to my mechanic.turns out my fan switch is coming on at 240 which is way too late.so I bought a jet performance fan switch 60600.the problem is now the switch works but comes on at 167 and my fan won't shut off.i have tried 5 other fan switches and I cannot fix this issue.my mechanic can't figure it out and I'm all out of suggestions.i don't want to add a manual switch I rather fix the issue but I cannot find anything else. My radiator and thermostat are good and coolant sensor is also good so I don't know what else to do. Can someone please help..
#2
Supreme Member
iTrader: (5)
Join Date: Nov 2010
Location: Mantua NJ
Posts: 5,825
Received 64 Likes
on
57 Posts
Car: 1 Owner 1986 TA with a WS6 package
Engine: 5.0 EFI
Transmission: THM700R4
Axle/Gears: 277 Posi Speedo
Re: Fan switch problem....
Just to let you know,the fan is supposed to kick on at 235
#3
Junior Member
Thread Starter
Join Date: Oct 2010
Location: Southern California
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc
Engine: 305 TPI
Transmission: 700R
Re: Fan switch problem....
#6
Junior Member
Join Date: Feb 2012
Location: Spirit Lake, ID
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 IROC-Z
Engine: 355
Transmission: T5
Axle/Gears: 3.23
Re: Fan switch problem....
One option would be to have your prom tuned to come on before it gets that hot. But maybe there is another issue. Are you sure the thermostat is working properly? Also, if you haven't already, you might check your fan relay. Also, if you have a thermal gun, you could verify that your gauge is reading accurately. Hope that helps.
Good luck!
Good luck!
Last edited by irockid43; 03-04-2015 at 10:36 AM.
#7
Supreme Member
iTrader: (2)
Join Date: Apr 2000
Location: Huntsville AL
Posts: 3,938
Received 97 Likes
on
62 Posts
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: Fan switch problem....
Fan Relay, Coolant Temp Switch, T-Stat. Are the fans still wired stock? Secondary fan comes on when AC is turned on and at a higher temp than 240, just don't know that number off the top of my head
Last edited by Bob88GTA; 03-04-2015 at 10:46 AM. Reason: more info
Trending Topics
#11
Supreme Member
iTrader: (167)
Re: Fan switch problem....
You've got an 89 350ci so I assume that you've got duel fans ?? If you've got duel fans then the primary fan is controlled by a signal sent by the ECM.
The secondary fan is the one that kicks on by the AC system and the temp switch in the pass side head. It's stock ON setting is 238 degrees.
These are from a 91 shop manual,.... but they might help !
The secondary fan is the one that kicks on by the AC system and the temp switch in the pass side head. It's stock ON setting is 238 degrees.
These are from a 91 shop manual,.... but they might help !
#12
Supreme Member
Re: Fan switch problem....
I used a SW555 switch. Comes on at 210 and got it at autozone.
Thread
Thread Starter
Forum
Replies
Last Post