The clutch is hydraulic and non-adjustable. Make sure the fluid is full in the clutch master cylinder. As far as checking the transmission, the fill and check plug is on the side of the transmission. When removed, the fluid should be level with the bottom of the threaded port that you remove the plug from.
As far as the heater core, that is a very involved process. For me to try and explain it would be very difficult and allow too much room for error via the internet. You should purchase a shop manual for your vehicle that has step by step instructions and pictures to guide you.
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Sunday, June 22nd, 2014 AT 9:14 PM