fairly significant
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
13,500 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.

2004 Nissan Sentra AC / heater problems

AC / heater problem

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2004 Nissan Sentra Owner Comments

problem #1

Dec 112004

Sentra 4-cyl

  • Automatic transmission
  • 13,500 miles


Air conditioning compressor will engage (A/C will turn on) regardless of ambient air temperature, when one or both of the following conditions are met: 1. when the interior cabin temperature dial is set to any temperature, including hot (red area all the way to the right), and the windshield defrost option is not set (A/C should not be on, but will turn on), or 2. the windshield defrost option on the air handler dial is set once, the air conditioning will turn on, and stay on regardless of any temperature dial change or other setting change the driver performs as long as the cabin blower stays on (selected speed from 0 through 4). In the best case, this will cause poor fuel economy due to the fact that the air conditioning is running without need in cold weather. In the worst case, instant fogging may occur on the interior side of the windshield as well as driver and passenger side door glass, which could lead to poor visibility and eventually a crash. Using heat settings in the winter at the same time the air conditioning is engaged will cause abnormally high humidity levels in the cabin. Consumer has experienced this several times since December has been the coldest month of ownership yet, and has resolved this problem by disconnecting the 12V-14vdc line that engages A/C compressor just for cold weather driving. Consumer secured the line using 2 plastic wire ties, securing it away from the automatic fan and the heat shield on the exhaust manifold to avoid an electrical malfunction. Line will be reconnected during warmer months.

- Union City, NJ, USA

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