RepairPal is your advocate for car care advice and guidance

Q: heating system only gets warm when accelerating cool air comes out at idle. on 2005 Nissan Altima

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when warming car up heat only works when raising rpms or driving. i cleaned out the heater core and replaced the top thermostat checked the bottom one was closed when removed,
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
| |
Could be several things. Your blend door might not be opening except under acceleration because some are controlled by vacuum. It could also be your water pump's fins may be busted causing not enough coolant to be pumped back into the heater core. Under acceleration the water pump turns quicker. Also, less likely it may be a head gasket leak, pumping air into your cooling system causing an air lock going into the heater core. What I would do is idle the car and check to see if both the in and out heater hose are getting hot as well as both radiator hoses. Let me know what you find out from that.
Didn't find what you were looking for?