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450SL

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Heater only blowing cold air.
There are two likely causes for your concern. Either your heater core inside your dashboard is clogged, or one of the doors that directs the air to your heater core is malfunctioning. I would enlist the help of a certified...
Tachometer malfunction
Hello. There are a few reasons why this is happening. The tachometer (https://www.yourmechanic.com/article/3-essential-things-to-know-about-your-car-s-tachometer) on the instrument cluster may be bad, and the instrument cluster may need to be replaced. There also could be a problem with the speedometer shaft and...
Gas pedal hard to apply, can't go past 55 mph
Hello. It sounds like the transmission isn’t shifting gears properly. A problem with the first, second, and/or third gear can cause difficulty with acceleration. Another possibility is that the catalytic converters are clogged (https://www.yourmechanic.com/services/catalytic-converter-replacement) causing poor acceleration. When this happens...
Engine steam and antifreeze leak - 1976 Mercedes Benz 450SL
Hello. This sounds like the water pump (https://www.yourmechanic.com/services/water-pump-replacement), radiator (https://www.yourmechanic.com/services/radiator-replacement), radiator hoses (https://www.yourmechanic.com/services/radiator-hose-replacement), or even one of the heater hoses (https://www.yourmechanic.com/services/heater-hoses-replacement), have started to leak. It is also possible that the gasket to the thermostat could have a leak as...
The transmission slips gears and the car has no kick down
If the transmission is slipping, then the vehicle will seem to not accelerate, or the vehicle will not move very fast. It seems that there could be an issue with the transmission that is causing the slippage. Check the kick-down...
Smoke from the dashboard, parking lights won't turn off
Hello. It sounds like there is a short in the wiring harness of the car. If the wiring comes into contact with other wiring, this may cause a short and smoke from the dashboard. This sometimes happens due to old...
Car won't start, battery drain - 1979 Mercedes-Benz 450SL
Hello. The Chilton manual will be able to give you accurate information as to the location of the voltage regulator (https://www.yourmechanic.com/services/instrument-voltage-regulator-replacement). This manual can tell you whether your voltage regulator is an internal or external part. It is not recommended...

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