Re: Heating problem?
With the engine warm, feel the heater hoses. They should both be hot. If they aren't it's likely the heater core is plugged. You can pull the hoses off the pump and flush it with a garden hose. Do not get the Opti wet. Refill coolant and bleed all the air out when done.
94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400+GearVendors OD/4.11's / Strange 12-bolt / 300-shot N2O / Spohn Suspension / 6-pt roll bar with integrated SFC's / full AutoMeter instrumentation / MoTeC M48 Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.