Check the blower relay, its only energized at HIGH speed. Check your voltage at the blower motor, when turned on to High, Purple wire, be sure it has 12V. Black wire should read "0" volts (ground). The Purple wire gets power from A/C Fuse 3 (30A) underhood relay/fuse box/ right side. High speed gets power directly through the relay, all other speeds go through the resistor. The Blower relay is the 3rd one on the firewall I believe, there may be other relays you can swap and see if the blower comes to full speed.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
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Last edited by TedRamAirII; 06-12-2017 at 04:28 PM.
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