If no external leak can be found, then the concern may be with the lower intake manifold gasket, intake manifold pitting/corrosion, or with low cylinder head bolt torque. Examine the radiator, side tanks, coolant recovery bottle, hoses and connections, intake manifold, cylinder heads and block for external coolant leaks. Run the engine for 10 minutes, or as required, to build pressure in the cooling system for a leak inspection. ACTION Refer to the following procedures for service details. This may be due to internal leaks from a failed intake manifold gasket caused by loose intake manifold bolts, a fouled intake manifold, pitting/corrosion, or loose cylinder head bolts.
heres the tech bulliten.:Ĥ.0L COOLANT LOSS - REVISED INTAKE MANIFOLD GASKET TECHNICAL SERVICE BULLETIN Reference Number(s): 95-9-10, Date of Issue: Related Ref Number(s): 95-9-10 ARTICLE BEGINNING CONDITIONS COOLING SYSTEM - LOSS OF COOLANT -4.0L ENGINE - REVISED INTAKE MANIFOLD GASKET AND INSTALLATION PROCEDURE LEAKS - COOLANT -4.0L ENGINE - REVISED INTAKE MANIFOLD GASKET AND INSTALLATION PROCEDURE APPLICATION Model(s): Ford Light Truck: 1992-94 Aerostar, Explorer, Ranger Bulletin No.: 95-9-10 Date: ISSUE Coolant loss, with no visible sign of leakage, may occur on some vehicles. Can be intake manifold gasket, or in sevser cases the heads also need replacing.
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