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Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 20382
Experience:  20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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2000 Sentra: heater..Does not blow heat at low rpm..Radiator

Resolved Question:

2000 Sentra: heater takes long time to heat up. Does not blow heat at low RPM and at idle. Radiator was replaced about 5 months ago. Could this be air in cooling system? How do you bleed air out of system?
Submitted: 7 years ago.
Category: Nissan
Expert:  Jay replied 7 years ago.
Hello and thank you for using

Do you have good heat when driving? Then when you stop and idle you loose heat?

Let me know, Thanks Jay!
Customer: replied 7 years ago.
Yes, There is good heat while driving. It loses heat at idle and at low RPM. Also, it seems to lose heat going down hill with foot off gas pedal.
Expert:  Jay replied 7 years ago.
Yes it sounds like the coolant isn't bleed properly. Here is the way I bleed the Nissan coolant system. You will need a coolant bucket or something like it to help bleed the air out of the system.

To bleed the coolant system, remove the radiator cap. Install the coolant bucket. Fill the bucket about 1/2 way. Then raise the front of the car as high as if it were on ramps. This way if there is air in the coolant system, the circulation brings it to the highest point. Then turn on the car, and put the heat on speed number 4, recirc mode on, and face mode. You may need to rev the engine a few times to move the coolant around to get the air out. After you have good heat, and little to no bubbles in the coolant bucket. Then the coolant system is properly bleed. You should have good heat when bleed properly. So when you put your hand over the vent and hold it there for 30 seconds, you get a slight burning sensation. That is perfect heat.graphicgraphic

If you have any more questions on this, please feel free to ask. Thanks Jay!
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