So i had the caddy towed to the shop to get fixed, a bunch of my glow plugs went bad so i went ahead and had them replace all 4 and replace the relay. came out to $126.00 no big deal. It runs now, thats a start. But my heat doesn't work still... It will blow heat through the defrost and i can adjust the temperature but i cannot control the blower speed. What steps would i take to start fixing this, i did a search and couldn't find anything. And would my ignition sensor have anything to do with this? its going bad and i have a new one sitting in the car waiting for installation.