2002 Nissan Altima Heater blows cool for a long time before

2002 NISSAN ALTIMA
112,000 MILES • 4 CYL • FWD • AUTOMATIC
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KNOXKEY
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  • 1 POST
The heater on our 2002 Altima seems very weak in the winter and needs to be driven 8-10 miles or so before there is any warmth blown at all. The Nissan repair shop has alread changed the thermostat a couple of times to no avail. The radiator has been flushed and filled with no improvement. Can you suggest something else? Thanks.
Jan 12, 2008 at 3:57 PM
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MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
Try warming the Vehicle, then carefully feel the heater hoses, are they both hot? If one is cooler than the other, You need to flush the core, or do a replacement job on the heater core. Also if the system has a heat control valve on the heater hose, make sure it is working! Also check the thermostat, and the temperature blend door, thats under the dash, in the heater plenum...You can flush this yourself, buy the prestone flush kit and install the tee in the heater return line. Disconnect the heater hose at the waterpump, clamp the hose in back of the tee you installed and back flush till it runs clear...20 mins or so.
Jan 12, 2008 at 4:18 PM
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