Crossover Pipe: The V-6 Fiero has a steel coolant pipe which crosses the firewall to connect under-car coolant line to the engine. (The outlet hose from the thermostat neck connects to this pipe.) The pipe is unique to the Fiero and can corrode. Replacements can be custom-made at radiator shops or a stainless replacement can be obtained from They are also available from the Fiero Store (