Question about 1998 Mercury Mountaineer

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No heat i turn on the knobs but only cold air comes out and this started yesturday morning can it be a fuse and if so which fuse?

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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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