UK Nissan Repair Questions? Ask a Mechanic Online.
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
This fault here is either due to a restricted heater core needing either back flushed or replaced if it will not flush out or an issue with the engine coolant being low in most cases.I would check the engine coolant level and see if it is low.If it is low this indicates there is a leak in the coolant system that needs located and repaired then the coolant level refilled.If the coolant level is full at an idle with the engine fully warmed up and the heater on high heat locate and feel both heater core hoses.If one is very warm to hot to the touch and the other is allot cooler this indicate the heater core is restricted needing either flushed out (you can use a garden hose or similar to flush it out with the heater core hoses removed from the heater core flushing both ends one end at a time until good flow is achieved) or the heater core needs replaced.
If both heater hoses are found to be hot to the touch and you are not low on coolant let me know.
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If he did not do a heater core flush as this is a different flush then the regular coolant flush this should be done.This can usually be done in around an hours time to see if it will free up and remove any debris from the restricted heater core and correct this here.If this was done and it is plugged then it will need replaced and this does sound like the cause for the fault here on this model with what has already been done.Usually if it was the water pump the engine would run hotter as well or over heat.
The dealer pricing I show for the heater core is $342 for the heater core itself and around $25 in coolant and 6.2 hours labor.You might be able to get a heater core from a local parts store cheaper in some cases.
Let me know if you need anything else and feel free to rate my help here.
O.k.,if you need anything else let me know.