Question about 2000 Lincoln Navigator
I replaced the heator sensor,the coolant level is correct, the heat setting is at 75 degress, and is barely noticable with the fan blowing??.
Has the vehicle been run with anti-freeze its whole life? If not, then flush heater matrix.
With vehicle in cold state, disconnect heater matrix feed and return pipes from within engin bay. Turn the vehicle's internal temperature setting to hot. If the vehicle is fitted with climate control, then do this with the ignition in the 'on' position.
Take a garden hose and with low pressure first, try flushing the matrix. If the water pressure is not enough to flow through matrix at low to medium pressure, then a blockage is almost a certainty. If water does not flow at first, then try using a high pressure air-line to force air and any blockage material through the matrix and out of the exit pipe. You can also reverse the flow to blow or flush any dirt out of the other end.
Once all is clean and free flowing, reconnect and fill entire system with a 50-50 anti freeze-water solution.
If blockage cannot be resolved, then replace heater matrix.
If no blockage is present then continue to check heater control switches and wires.
Posted on Oct 30, 2012
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Posted on Jan 02, 2017
Follow the heater hose from the engine, and as you get closer to the firewall, you should run into it. It is in line with the hose, and should have a vacuum hose connected to it. Apply vacuum to the valve and it should move. If not, then replace the valve. If there is no vacuum when engine running and heater turned on, then check the hose for leaks or the vacuum source.
Posted on Feb 15, 2011
SOURCE: heat/ac fan only blows on high
Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...
Posted on Apr 27, 2010
Testimonial: "This is great information and I will check it soon. Had some back surgey and can't check it right now."
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