Okay, I'm at a loss. I have built several C4s, and I can do alot with my eyes closed. But I know there is someone who knows more. I cannot find the lcation of the blower motor relay on an '87. I need to know the factory location for both types of HVAC, manual and ACC.the factory service manual does not tell the location under the dash. Neither does Chiltons, Haynes, etc... 

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Joel Adams  
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

You mention the 5A fuse, and that is only present on the C68, so I looked that up in a 88 Helms manual.

I find mention of a Blower Control Module. Located: "Front of dash, in LH side of evaporator housing".

The wiring diagram does not show a "relay". Only this module that has a power input from a fuse link (red), ground (blk), output to motor (purple), and control from Control Head (brn).