1994 GMC Suburban Owner's Manual - Page 283

Adding Coolant -Gas Engines The coolant recovery tank is located on the passenger sideat the rear cornerof the engine compartment To Check Coolant When your engine is cold, the coolant level should be at COLD, or a little higher. When your engine is warm, the level should be up to HOT, or a little higher. To Add Coolant If you need more coolant, add the proper mix at the coolant recovery tank. Add coolant mix at the recovery tank, but be careful not to spill it. 6-37