Question about 2001 Lincoln Navigator

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Heater not working

Replaced radiator hoses & thermostat. Tried to add back in coolant, but it only held 3 gallons. System is suppose to hold 7 gallons. Never found engine coolant drain plug. Radiator plug is clogged. Upper 1/3 of radiator is all that gets warm during operation. Besides getting a new radiator, what else could be wrong? If is was the heater core, I would be getting leakage in the passenger floor board, correct? Someone said it could be head gasket. How do you diagnose that?

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The Navigator has rear air, so coolant lines run to a heater core in the rear. It will help if you elevate the front of the truck on a set of ramps or incline. Turn the heat for both front and rear. Run the truck and add coolant as needed until all the bubbles come out of the coolant tank. You can tell when you get coolant to the rear when hot air blows from the vents. By raising the front of the truck you allow the the air in the lines to bleed to the front.

Posted on Aug 31, 2009


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1 Answer


1. Make sure the engine is cool.
2. Using a clean bucket disconnect the lower radiator hose and carefully drain around 1 gallon off coolant then reconnect hose.
3. Follow the upper radiator hose to the engine where it's connected to the gooseneck on the engine.
4. remove the 2 bolts holding the gooseneck and lift it up to remove the thermostat making a mental note on how it was installed.
5. Clean both sides of the gasket surfaces, install new thermostat in the same position it was removed and replace O ring(only use a Motorcraft replacement to avoid having fit issues) alternate tightening bolts until tight.
6. Refill radiatior to proper level.
7 Leaving the raditor cap off, start the car turn on the heater and let it warm up keeping an eye on the coolant level, it will go down once the air works it's way out of the cooling system.
8. Top off the system and tighten radiator cap. Check the coolant level several times during the week, there may still be some air left in the system.

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1 Answer

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The water in my radiator is lowering when i push the throttle down. This happened during a flush i did. Its full but the water lowers and rises when you move the throttle any at all. I dont get where its...

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1 Answer

My heater does not blow hot air. 1 thermstat has been replaced 2 could water pump be bad 3 water does not seem to be circulating through the hoses. 4 the air mixer under the dash seems to be workig.

If the thermostat was recently replaced, it could be trapped air in the cooling system. First, you need to establish that the thermostat is working. Remove the radiator cap and start the engine. Let it warm up to normal operating temperature on the temp guage. Make sure the heater is set to the hottest setting. Observe the coolant in the radiator. If the coolant is flowing when the engine is cold, then the thermostat is stuck open and the heater won't get warm. If the coolant is not flowing, continue to watch the coolant. When the thermostat opens, the coolant level will drop in the radiator tank, add antifreeze to bring it back to full. Each time the coolant level drops, add more antifreeze. should the thermostat close while doing this, antifreeze may spill over from the radiator tank. No to worry. As son as the thermostat opens up again, add antifreeze to fill the tank. Continue to do this until the coolant level no longer drops. Sometimes it is necessary to raise the front of the vehicle so the radiator is high than the engine in order for the air to escape. Put the radiator cap back on. If the problem was air in the system, then the heater should be warm now. In the old days we would just drill two 1/8 inch holes in the new thermostat before installing it. That allowed the trapped air to escape slowly. Might still be an option.Let me know if this helps.

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04 Chev. Avalanche 1500 Z71 5.3 125K mi. Temp gauge reads erratic from 210 to 245 or so. heat blows warm then cold. Coolant level, OK. I have been told could be sticky thermostat but usually is restricted...

Normally the engine operates at 195F, if you did not replaced thermostat with another one at 185F. If the temperature has a tendency to rise up, the reason is a partially obstructed cooling system or/and a bad thermostat.
The first part of the cooling system that gives up is the heater core, because the coolant flowing channels are thin. You got a good advice but not the best one. It is the time for a coolant flush in your car. To do do it right then you need time. Plan ahead for a week end. With a cooled engine, start as your friend advised you with the heater core hoses. Disconnect both of them, but the dirt has to go out of your car, so with a garden hose back flush it and let the dirt to get out of your cooling system. After you will get clean discharge, it is the time for coolant bottle, remove it, discharge the used coolant and clean it. The third to come is the radiator. Open the drain cook, or disconnect the lower radiator hose, and disposal used coolant properly. Now open the radiator cap and flush with water the radiator till discharge will be clear. You think that you are done? Not yet. There is half of old dirty coolant trapped in the system.
Install everything, and connect all coolant system hoses, radiator, heater core and coolant bottle. Now you have to run your car with water. Fill out the cooling system with distilled water, start engine, turn on the heater high, and run till upper radiator hose get hot. That means the thermostat opens.
Let the engine to cool down, open the radiator cap, and draining cook or lover radiator hose and drain everything. You can use flush detergent if you wanted at this stage, but flushing with detergent will add 4 more hours, because detergent is colorless and you have to guess how many fill and drain processes do do to get rid of it. I do not do it, but if your cooling system is very dirty you have to do it. After the last drain, fill the cooling system with concentrated antifreeze and 30% distilled water. The reason is because it is more water trapped inside the cooling system. The goal is to reach 50/50 concentration. You need a coolant tester to find this. Start the engine and add coolant til radiator is full. Install the radiator cap and bleed the system. After driving you car for a day or so, let engine to cool down, open the radiator cap check the concentration of coolant with the tester and add antifreeze or distilled water as necessary. It is a good idea to replace the thermostat while flushing the radiator. This procedure has to be done every 2 to 3 years. It is up to you to decide to use RED GM Dex-Cool or GREEN Prestone antifreeze.
In all my cars I have replaced Dex-Cool with Prestone, but I flush the system every 2 years, and I never had a cooling system problem in all my cars.

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