Q: Heater blowing cold

What makes you think it is a fuel problem. I would need more information before I can help you diagnose the problem. The proper way to check for fuel issues is to put a fuel pressure gauge on the fuel...

The starter on this vehicle requires a shim, so its possible that got left out when the starter was replaced. This could cause starter engagement problems and the metal on metal noise you're hearing (https://www.yourmechanic.com/services/car-is-making-a-noise-inspection). Backfiring (https://www.yourmechanic.com/services/engine-is-backfiring-inspection), on the other...

Hi there. Usually when the motor becomes flooded or has a hard time maintaining a solid idle, it's caused by either a vacuum leak or a malfunctioning idle control valve (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-idle-control-valve). However, this issue may also be caused by bad...

Hi there. According to the shifting charts to your transmission, third and fourth gear both use the Overdrive Clutch as a holder to get the gears with the Underdrive Clutch and the Fourth Clutch. Since your vehicle will only get...

The lack of heat being generated by your system may indicate a clogged heater core. The [heater core]((https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this...

Hello, thank you for writing in. There are typically three different components that serve as safety devices for vehicles with automatic transmissions. These make sure the vehicle is not taken out of gear unless intended to, which is a good...

Hi there. Sounds like the mechanic used a chemical that includes washer cleaner that helps clean out the fuel injectors. This can burn, but it is very toxic. I recommend venting the garage while the fuel is being burned until...

The battery should be load tested by a professional. Load testing can only be reliably performed on a fully charged battery. If the battery passes a load test, you have to be sure it is NOT a marginal pass in...

Hello - your Mercedes transmission is in "limp mode (https://www.yourmechanic.com/question/car-stuck-in-limp-mode)". Something has failed in the transmission, and it has engaged 2nd gear as a limited means of getting you to a repair shop. If you could forward the specific codes...