Question about 2003 Nissan Sentra

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How to purge heating system on a 2003 nissan sentry

Heater blowing cold air at idle. changed stat. flushed system. not sure about pneumatic.

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This system has to be purged of all air. This has to be done at a shop that has this tool. It basically vacuums out all the atmosphere just like an HVAC vacuum pump. It then sucks in the coolant thus no air pockects.

Posted on Mar 29, 2015

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Posted on Jan 02, 2017

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Could be the water pump. When it heats up the impeller can spin on the shaft. Not enough pressure to push it the the heater core. Make sure you purge all the air out first. Cores are bad for holding air. Some cars worse than others.

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My 2005 nissan xterra heater blows cold at idle, but would get warm to hot when I rev-up or started moving the vehicle. Also, the A/C compressor turns on when I set it on defrost/floor or defrost. I've...


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If so, you could have a faulty thermostat, an air pocket in your cooling system or maybe even a leak somewhere. My truck's heat would only work while I was driving, then stopped working altogether while the engine started to overheat. I changed the thermostat, then the heat would blow hot/cold/hot/cold, I didn't realize you had to bleed the air out of the system after changing the thermostat. I did that and now the heater and engine run great.

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1 Answer

Heater blow cool air at idle


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Heater blows cold air when idle


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