Question about 1998 Mercury Mountaineer
Heater matrix failure is a common problem in cars, this may need replacement. This is like a small radiator connected up to the engine cooling system in most cars (hence the need for the car to warm up before hot air is delivered)
It can also get blocked or leak in the same way as a radiator can. Then you'd need to flush it
You might want to check your coolant level, low coolant can cause this problem.
final option is the mechanical switch for air flow could be broken (usually you hear a whumph when you switch from cold to hot as the air is diverted)
hope this helps
Posted on Nov 13, 2008
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Posted on Jan 02, 2017
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