The AC evaporator can develop a leak resulting in insufficient AC cooling. Our technicians recommend when replacing the evaporator, have a pollen filter kit installed to help with air quality in the cabin.
Problems for specific Volvo models:
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There is a computer that controls all these items and it's called the rear electrical module, or the "REM". To temporarily address this issue you can pull the fuse from the rear fuse box labeled "REM" and everything should start working again.
Volvo has updated software for the REM that will help prevent this from happening again. See a Volvo shop or Dealer and have this and all the software in the vehicle checked and updated every 30,000 miles.
The anti-lock brake system (ABS) Control Unit has a high failure rate. When this fault occurs, the ABS light will illuminate and codes may be stored indicating a problem with the ABS Pump Motor, or Wheel Speed Sensors, but the problem is the ABS Control Module.
Other symptoms may include an illuminated Check Engine and transmission shift light, and the speedometer may stop working as well.
Note: The brake system will operate normally however during a panic stop the Anti Lock Brakes will not work and the wheels may lock-up, causing a lack of vehicle control under these situations.
It's quite common for the the fuel pump to fail, causing a no start condition. The engine will crank over but it will not start.
To verify this the fuel pressure and electrical power to the fuel pump should be checked. If the pump is getting power and there's no pressure, replace the pump. If it isn't getting power, check the fuel pump relay circuit.
The sway bar bushings commonly wear out, causing a knocking noise from the front of the vehicle. Replacing the worn bushings should correct this concern.
Engine oil leaks from the PCV housing are common.
Front and/or rear sway bar end links may wear out prematurely, causing a knocking noise from the front or rear of the vehicle when driving on bumpy roads. Our technicians recommend inspecting the links at each service, they should be replaced if any looseness is found.
The electronic throttle module (ETM) has a higher than normal failure rate. There is a possible extended warranty and/or a software upgrade offered by Volvo for this problem.
If the check engine light is on and diagnostic trouble codes point to the air pump system, then the entire system needs to be checked.
There are a few issues that arise from the vacuum lines becoming plugged or disconnected but the most common issue is the air pump itself fails. The reason the air pump often fails is from a defective air pump check valve that allows exhaust gasses to contaminate the pump.Replacement of the air pump and check valve is necessary to address this issue.
One thing to be aware of: If the problem is not addressed eventually these exhaust gasses can contaminate the MAF Sensor and Oxygen Sensors as well, causing the engine to run very poorly and cost much more to fix.
The evaporative emissions system has problems with the purge valve, tank pressure sensor, and the fuel cap. All of these failed components will cause the check engine light to illuminate. To prevent turning on the check engine light accidentally, make sure the fuel cap is installed correctly after re-fueling
The battery B+ cable has problems with the terminal end necessitating replacement. Symptoms may include no start, cranks wont start, warning lights coming on and other odd electrical issues. The B+ cable end is located in the engine compartment fuse box near the drivers side shock tower.