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cooling fan will come on

Old Blue Coupe

New member
Joined
Jan 18, 2019
Messages
4
Location
Canada
Corvette
1987 - Blue Coupe
primary cooling fan does not come on ;;have replaced fan motor-fuseable link ....green white does make ground....when key is on...if I ground grn /white it will run ecm is to make ground..ecm no good? please help pulling hair out:w
 

Old Blue Coupe

New member
Joined
Jan 18, 2019
Messages
4
Location
Canada
Corvette
1987 - Blue Coupe
in previous post should read..green/white does not make ground when key is on
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
Have you read the Factory Service Manual's information on cooing fan operation and diagnosis?
 

DaveP85C4

Active member
Joined
Oct 11, 2007
Messages
43
Location
Kalifornia
There should be 12 volts on the grn/wht wire wih the key ON, engine OFF. If=NO, there's a COOLFAN fuse in the RH dash. 3 amp. This is the fuse for the control circuit.



Nw I remember why I do't pst here vdry much. There'sa key-logger orsomething that causes key-stokes to be mssd or omitted. akes te osts come lot lke gibrish if yopu tpe 50WPM like I can.
 
Last edited:
Joined
Jan 31, 2005
Messages
416
Location
Somewhere in Red Wings land
Corvette
1989 Bright Red Convertible (gone) 98 Jaguar XK8
Follow Hib's advice and get the FSM's, especially if you plan on doing your own maintenance. Do the fans ever come on? And, if I remember correctly (no longer own the car so the memory is a bit fuzzy..), my primary fan didn't come on until the water temp hit 225, the secondary at around 235 unless the A/C was on.
 
Last edited:

Old Blue Coupe

New member
Joined
Jan 18, 2019
Messages
4
Location
Canada
Corvette
1987 - Blue Coupe
I just recently purchased factory service manual and wiring manual. I used the diagnosis trouble tree and it came up with ECM is the problem - it is not turning on the ground circuit that supplies ground to the coolant relay. I am currently looking for an ECM to try before I actually buy one. Thanks for help and note. Al
 

Old Blue Coupe

New member
Joined
Jan 18, 2019
Messages
4
Location
Canada
Corvette
1987 - Blue Coupe
I got an ECM to try no luck....so I am very frustrated ...I ordered a new hypertech prom ..thats was in ecm when purchased car installed new ..everything works this post may help other guys this problem Old Blue Coupe
 

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