Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** the noise was coming from under the dash then it may have been air in the heater core. This can occur if the engine temperature is not regulated. If the temperature is fluctuating like that then you may have an issue with the thermostat failing. It is also common for the catalytic converter in the exhaust to start to fail and make a noise like this which can also cause some engine temperature issues. These things needs to be checked first. Please let me know if you need more help.