denvervet

I have a 87' L98 today it got hot 250 in the garage when shut it off.opened hood and my cooling fan won't come on I tried with a/c on and then in diag mode no fan. I checked for power at fan with test light and seems that there is no power to fan at all. i am goin to start a search right now but any help would be appricheated.
Thanks in advance

williammackean

On the ALDL bus by the driver's side right knee.

Connect the A & B pins (Top right and the one immediately to the left of it.)

Turn key to 'on' position, but do not start.

Fan on = Temp sender circuit problem.
Fan off = Fan relay circuit problem.

denvervet

Fan off where is the fan relay located?

schrade

No power seems to be a closed case. Did you try jumpin' in just to confirm functioning?

denvervet

waitin for it to cool down

Hwy St*r

am i missing something? 157? my car. also a '87 L98, runs on average at 186-190. i thought i read somewhere that the fans don't kick on 'til 225....

have a happy and safe 4th to all!!!

denvervet

that was a typo it 257-260 when i checked fans for power with test light and no power on sat will remove and check with 12v on bench

AGENT 86

http://members.shaw.ca/corvette86/Co...%20Control.pdf

williammackean

Removing the fan is a b!tch. Just un plug it and run 2 wires directly from your battery to it just long enough to see if it's not broken.

Then (while disconnected) jump the A & B pins again and turn to 'on' position. Test voltage at that connector to see if you got juice. If the fan works, you probably won't have power there. Follow Agent96's diag pdf.

I'm betting a loose connector or fan relay is shot.

schrade

Remove it?

Just JUMP it - battery to the power input.

No fan = bad ground = problem fixed.

ed.: already explained...

denvervet

Thanks agent86 for the diag. from what it says "Repair open CKT that did not light on C or E. where do I find the fan fuse on C or E ?

thanks for the help

AGENT 86

C and E are terminals on the fan relay. C is powered by the fan fuse in fuse block and E is direct power from battery through a fusible link near the battery. You can follow the wire from the relay towards the battery and you will find the fusible link.

denvervet

so would that make E my open ckt? when i jump A&B for diag. test the fan dose not operate but I do here a clicking in the sensor under the mass sensor

AGENT 86

If there is no power at terminal "E", the fusible link is blown. If there is no power at "C"(ign on), the fan fuse may be blown. If there is no ground at "B" while "A"+"B" are jumpered at ALDL(ign on), then there is an open circuit from ECM.
If all 3 of those are good, there should be power at terminal "A", that sends the power to fan.
Does that clear the fog ??