2001 Nissan Pathfinder Heater Goes Cold

2001 NISSAN PATHFINDER
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BODIE
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4x4 with 101,000 miles on it. Heater works while idling Once moving about 4-5 miles it will blow cold air and shortly after temp gauge goes to hot. Radiator, thermostat, water control valve, and water pump have all been replaced. System has been pressure tested and bled. Still has same problem.
Jan 23, 2007 at 7:04 AM
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RASMATAZ
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[quote:dbfa3f99e4="Bodie"]4x4 with 101,000 miles on it. Heater works while idling Once moving about 4-5 miles it will blow cold air and shortly after temp gauge goes to hot. Radiator, thermostat, water control valve, and water pump have all been replaced. System has been pressure tested and bled. Still has same problem.[/quote:dbfa3f99e4]


Take the Stat back out-start it up run it for 10mins, hop inside do you feel more warm and cozy-if so change the Stat again might be Manu. defect.
Jan 24, 2007 at 12:25 PM
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SERVICE WRITER
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While it certainly is quite possible of a bad t-stat even though it's new, Try bleeding any air in the system again.


https://images.2carpros.com/forum/automotive_pictures/30961_nissa_1.jpg

Jan 24, 2007 at 12:41 PM

Suggested Repair

Remove the thermostat and run the engine about 10 minutes to see if cabin heat improves. If it does, replace the thermostat again in case the new unit is defective, and bleed the cooling system again to remove trapped air.

Conversation Summary

A 2001 Nissan Pathfinder owner reports heat at idle that turns cold after driving a few miles, followed by the temperature gauge going hot. The radiator, thermostat, water control valve, and water pump were already replaced, and the system was pressure tested and bled. Experts suggest a possibly defective new thermostat and recommend testing heat with it removed, replacing it if needed, and bleeding air again.

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