i only get heat when i accerlate on 2001 Nissan Xterra

i replaced the thermostat the heat censor and put all new antifreeze in the system

by in Cresco, PA on April 18, 2013
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3 answers
ANSWER by , April 18, 2013
Possible air in system, low coolant level, defective water pump impeller or restricted heater core. Does the temp gauge go up when at idle for an extended time?
ANSWER by , April 18, 2013
I agree with wetry ,I would try bleeding the system first
ANSWER by , April 18, 2013
or blend door issues