Engine Overheats

System low on coolant

Replenish coolant and check for leaks.

Dirt, leaves, or insects on radiator or condenser

Clean radiator and/or condenser.

Hoses, water pump, thermostat housing, radiator, core plugs, or head gasket leakage

Repair as necessary.

Thermostat damaged

Check thermostat.

Cooling fan motor or cooling fan relay

Inspect cooling fan motor and relay.

Radiator hose plugged or rotted

Replace radiator hose.

Water pump damaged

Replace water pump.

Radiator plugged

Inspect, clean, and/or replace radiator.

Coolant recovery reservoir cap damaged

Inspect, test, and/or replace coolant recovery reservoir cap.

Cylinder head or block cracked or water passages plugged

Repair as necessary.

Accessory drive belt and/or tensioner

Inspect and replace as necessary.

Plugged heater core

Repair as necessary.

Plugged heater hose

Check heater inlet, outlet, and surge tank to engine hoses.

Vehicle air deflector damaged, cracked, or missing

Replace air deflector.

Coolant solution

Check protection.

Damaged or missing fan shroud

Replace fan shroud.

Coolant Loss

Check coolant surge tank cap.

Replace if necessary.

Leaks: Check hoses, radiator clamps, water pump, thermostat housing, radiator drain valve, soft or core plugs, heater water valves, and heater core, and low engine coolant level switch.

Repair if necessary.

Intake manifold gasket to EGR passage

Replace gasket. Check manifold and cylinder head for warpage.

Oil in Coolant

Automatic transaxle oil cooler in radiator

Repair as necessary.

Cylinder head gasket

Repair as necessary.

Cylinder block/head casting porosity

Repair as necessary.

No Heat From Heater

Foaming coolant observation in coolant surge tank after engine warm-up

Pressure check system by installing pressure tester on coolant recovery reservoir fill neck and checking coolant recovery reservoir cap, also, check hoses, clamps, filler neck, etc., for obstructions or plugging in the hose between the cylinder head, heater core, coolant recovery reservoir, and thermostat housing.

Thermostat damaged

Inspect thermostat.

Water pump seized or defective system low on coolant

Inspect water pump replenish coolant and check for leaks.

Heater core or hoses

Check for coolant flow through heater. Repair as necessary.

Low coolant volume

Repair as necessary.

Cooling Fan Inoperative

Cooling fan circuit

Reference Cooling Fan Circuit

Chart No. 3

Cooling Fan Operates All The Time

Cooling fan circuit

Reference Cooling Fan Circuit

Chart No. 4