Q: Heater blowing cold air

Coolant can leak from dozens of places on a vehicle. The best way to pinpoint a coolant leak is to perform a cooling system pressure test. A qualified technician from YourMechanic will be able to perform this test for you...

Hi there. A misfire in an engine can be due to a faulty ignition coil, spark plus, distributor, or spark plug wires. Have a mechanic, such as one from YourMechanic, run a diagnostic check on the misfiring issue (https://www.yourmechanic.com/services/engine-is-misfiring-inspection) to...

Hi. If it moves forward, but not backwards, it is most likely the switch. A few simple checks with a test light can determine what it needs. Make sure there isn’t anything in the track preventing the movement. I’ve seen...

Hello there, misfires are a common fault on cars as they get older such as the 2002 Mercedes CL500. Many different faults can cause the misfires such as the spark plugs (https://www.yourmechanic.com/services/spark-plugs-replacement), coil packs (https://www.yourmechanic.com/services/ignition-coil-replacement), fuel injectors (https://www.yourmechanic.com/services/fuel-injector-replacement), fuel pump...

Typically a high idle issue is caused by a bad idle control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) or a vacuum leak. When you apply pressure to the throttle and it bogs down, that tends to also be a vacuum issue. Some of the...

Hi there. Usually this situation is caused by an EGR valve (https://www.yourmechanic.com/services/exhaust-gas-recirculation-egr-valve-replacement) that is dirty and needs to be cleaned. This component recirculates unburned fuel particles (carbon) from the exhaust and back into the intake manifold to be burned a...

Hello. The diagnostic codes (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) you are receiving may be a result of both sensors failing, or a power supply issue. The code P1639 stands for an A/C refrigerant pressure sensor voltage shortage. The second code P0452 (https://www.yourmechanic.com/article/p0452-obd-ii-trouble-code-evaporative-emission-control-system-pressure-sensor-low-input-by-logan-utsman) stands for...

Hello. Thank you for writing in. There are several components that may cause the steering to be loose or jerky. The first thing to do is check the power steering fluid color and level. Make sure its clean and topped...

The oil pressure light will usually come on when a few things could be happening. Either the motor is in fact low on oil, the oil pump could be failing or the oil pressure sending unit (https://www.yourmechanic.com/services/oil-pressure-sensor-replacement) is not working...