1999 Jeep Grand Cherokee Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Jeep Grand Cherokee
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Never overpay. Check prices with our estimator
1999 Jeep Grand Cherokee ProblemsHVAC Air Flow Switching to Defrost When Accelerating
The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. There is also a revised vacuum check valve available to address this concern.
Temperature blend and recirculation doors commonly fail, which can cause the AC modes not to change or the temperature to be different on the left and right sides. If replacing blend air doors, a recirculation door, a door link, or a sub-assembly housing, new heating, ventilation and AC (HVAC) sub-assemblies are available that improve reliability.
Failure in the blower motor power module (automatic temperature controls) or resistor block (manual AC) may cause the heater blower motor to work only on the high setting. The connector to the power module/resistor block is known to overheat (and sometimes melt). The connector or terminals should be replaced; a replacement connector is available.
1999 Jeep Grand Cherokee QuestionsHow can I pass a smog check when the check engine light stays on. (1 answer)
The check engine light stays on due to the gov pressure sensor continuously blowing out on the transmission. The first gear is not creating enough pressure., but the vehicle runs great.
Can Reset Code And May Not Do It Again For A Week.
It blows cold but as you accelerate on hwy etc. It changes ftom front vents to defrost vents back an forth a when increasing speed . The temp also slightly changes to less cooler .when set on cruise and left at steady rpm / mile per hour consistsncy it seems to even out and resume normal status ...
1999 Jeep Grand Cherokee RecallsJeep Recalls 1999-2002 Vehicles With 4.0L Engine Due to Debris Collecting in Number 3 Cylinder
The design of the intake and exhaust manifolds allow for debris collection in the area of the number three cylinder. This may cause a fire hazard. Dealers will install a manifold shield to modify air flow characteristics to prevent debris accumulation.