My heater blower motor stopped working started to take it out and it started working but the air coming out does'nt stay warm unless its on 90 any idea

Ola fellow GTO owner!

Blower Motor Resistor.

It's basically a printed circuit board with impregnated resistors on it. There is a resistor with a certain resistance amount for each blower speed setting. Those resistors sometimes go "POP".

It's a pretty easy fix if you're willing to buy the part and be a contortionist to get the underside of your passenger footwell apart. The resistor is mounted on the blower motor housing itself.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

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Yea thats what I thought too.Whats odd is that I started to take it out had five of the screws out let it sit overnight and the next day I just put the key to check if it would work and it did so back together it went and no problems since.I did check on the price of the resistor and got three price $140 $190 $199.Thanks for the reply.The GTO is one of the best built cars I have ever driven,SO SO MUCH FUN TO DRIVE TOO.