NHTSA — Visibility: Defroster/Defogger System: Windshield: Heater Core Problems


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
60,000 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

1998 Mercury Mountaineer accessories - exterior problems

accessories - exterior problem

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1998 Mercury Mountaineer Owner Comments

problem #2

Dec 232004

Mountaineer 8-cyl

  • Automatic transmission
  • 120,000 miles


Purchased used 1998 mecury Mountaineer from local Mercury dealer, discovered the heater pleanum door actuator was faulty and the air conditioning system would only provide constant hot air on all settings, other than max-ac. The problem is that due to this faulty part, defogging/defrosting the windshield is a challenge, causing my son to drive frequently with a fogged windscreen. Mercury dealer service shop and other shops locally are aware of the problem with many of these models, and repair is done by replacing the entire heater plenum which houses a new type of door actuator. This is a safety issue and should be recalled!

- Cumming, GA, USA

problem #1

Aug 112004


  • miles
The consumer was concerned that every year she has to replace the heat sensor. Last year she had to replace it before the vehicle could pass emissions because the check engine light came on. This year the same thing happened. The consumer took the vehicle to the dealer and was told that the problem was the heat sensor. The consumer stated that she replaced the original tires due to the recall on the tires (defect number : 01X001000). The inside of the tread came apart.

- Chicago, IL, USA

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