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Hello, the rear ac blower motor doesnt work at all? What happenes to the front ac when going up a hill, does it start blowing warm?
Hello, the front blower should never stop unless you turn the blower off, so if you are loosing airflow that is not normal. The rear blower not working at all could be an issue with the blower motor itself, is the rear not working on any speed? The front still blows but changes temperature to warmer?
Hello, do you need more help or information?
Ok the problem with the front is an issue with the vacuum supply, when the engine is accelerated the engine loose vacuum, there is a vacuum check valve then allows a vacuum tank to keep vacuum supplied to the blend doors. When you loose vacuum the airflow will default to the front defroster mode. Inspect the white vacuum line under the hood on the passenger side coming off the engine heading to the ac box. There will be a check valve in line.Make sure the vacuum hose is in one piece. Vacuum is only allowed in one direction. Replace the vacuum check valve first and recheck. If it still has an issue, there is a leak in the vacuum tank which is located on the rear of the ac evaporator box, which would require removal of the evaporator case. or you can run a remote vacuum tank in line of the old tank to resolve this issue inside under the dash instead. As for the rear blower gain access to the rear blower motor and test for power and ground to it in the rear ac case. if it has power and ground then the motor has failed and needs replacement.
Hello, do you need more help with this concern??