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need help with fan

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Old Aug 3, 2015 | 11:53 PM
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jj electric
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I need help my 86 vette fan its not coming on replace cts and fan relay and temperature goes above 230 and fan wont turn on if i ground the green wire to relay it comes on
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Old Aug 3, 2015 | 11:57 PM
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Turn the ac on and see if they come on. Does yours have a digital and a analog temp?
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Old Aug 4, 2015 | 12:06 AM
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Its digital what i notice when i was checking the green with white wire coming from my ecm to ground the relay it doesn't have any ground at all and i check the wire coming out from cts and that one has 1.5v could it be my ecm not sending signal to relay
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Old Aug 4, 2015 | 01:23 AM
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Im not sure but I wonder if the fan relay isn't controlled by a switch in the head like 84 was.
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Old Aug 5, 2015 | 03:27 PM
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Originally Posted by jj electric
I need help my 86 vette fan its not coming on replace cts and fan relay and temperature goes above 230 and fan wont turn on if i ground the green wire to relay it comes on
If grounding the green wires makes it come on, I would look for an open in the circuit between relay and ECM.

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