Identified leak in intake manifold hose...has been overheating..2001 mercury villager ( actually Nissan quest ) new radiator, new belts, thermostat, bypassed heater coil, and shop says is intake manifold hose [email protected]

the following is for a nissan quest, but they had a joint venture between Nissan & Ford to make this generation minivan ~1999-2002


(i have a mix of ford and nissan stamped parts in my minivan!)


http://www.nicoclub.com/FSM/Quest/2002_Quest/ec.pdf

start at page EC-22

credit and kudos for Greg who keeps nicoclub site running!

Exhaust Converter Blocked ?

Did you check for combustion gases at the
coolant or radiator fill

Your down to a head gasket or a crack somewhere

I would think the head gasket is common on that
motor possibly,research that

Timing Belt worn or jumped ?

The sensor should be on top of the block under the intake manifold.

A common problem with Nissan products, which this van is a Nissan Quest with Mercury trim.
There are several small rubber fuel hoses around the intake. When the air temp is cold these hoses can leak and then stop leaking when the air temp warms up.
When the air temp is cold, look around the intake with the engine running and you should see one of the hoses wet with fuel.
Just tighten the clamp.

make sure thermostate is good you need to leave it in there you can buy a lower cooling thermostate you prob. have a 180 degree and can get a 160 i would check the cooling fan also if its mechanical these r going to wear out at some time and if it electric theyb wear out as well and make sure fan shroud id tight agaist radiator and not broke anywher

1999 Nissan/Datsun Truck Quest Mini Van 3.3L SFI 6cyl

The thermostat is located in the thermostat housing, which is mounted to the coolant crossover tube. The bypass hose is connected to the thermostat water inlet on one end, and to the intake manifold water outlet on the other. The thermostat is not located in the intake manifold water outlet, where the upper radiator hose is connected.



Fig. Thermostat water inlet sealant application


Hope helps.

Hi, Disconnect battery ground cable, then drain coolant. Remove accessory drive belts. Remove A/C compressor drive belt idler pulley (tensioner) bolts, then idler pulley (tensioner). Remove upper radiator hose bracket bolt. Loosen two upper radiator hose clamps, then remove upper hose and bracket. Remove coolant bypass hose between thermostat housing and intake manifold coolant outlet. Disconnect main wiring harness from upper front cover (timing belt) cover, then remove eight upper timing belt cover bolts, then the upper cover, Fig. 20. Raise and support vehicle. Remove right front wheel and tire assembly and splash shield. Use strap wrench tool No. D85L-6000-A, or equivalent, to hold water pump pulley while removing water pump pulley bolts. Remove water pump pulley from water pump. Remove crankshaft pulley. Remove five lower timing belt cover attaching bolts and the cover. Rotate crankshaft in a clockwise direction to align crankshaft and camshaft sprocket timing marks, Fig. 21. If timing belt is to be reused, mark direction of rotation. Loosen timing belt tensioner nut, then remove timing belt. CAUTION: With timing belt removed, avoid turning camshaft or crankshaft. If movement is required, exercise extreme caution to avoid valve damage caused by piston contact.
Take care

they are under the intake manifold. It must be removed. About 7 formed hoses. Buy from Nissan dealer.

go here for info.

http://groups.yahoo.com/group/villagerquest/

You'll need to remove the upper radiator hose from the thermostat housing. Unbolt the 2 bolts holding the thermostat to the intake manifold and remove the thermostat housing and thermostat. Clean both mating surfaces and install the new thermostat with a new gasket, reinstall the radiator hose, fill with anti-freeze and check for leaks.

1 Inspect Cooling System Mix Coolant level low or flow is restricted. 2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. 4 Inspect Radiator Cap Worn or damaged radiator cap 5 Inspect Thermostat Thermostat stuck closed 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). 8 Inspect Water Pump Damaged, worn or leaking water pump. 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders