Question about Lincoln Navigator
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Posted on Jan 02, 2017
SOURCE: low coolant
No 1, replace the rad cap.
You also need to have the cooling system leak tested, for carbon monoxide ingress, the tester fluid will change color, indicating possible leaking head gasket.
The cooling system needs pressure testing, with a test pump.
This will normally show up a leak.
Check under carpets, for heater matrix leak.
Good Luck !
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Posted on Feb 04, 2009
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