Why does my car fan cycle on and off?
It starts as soon as I start up the car, whether it’s 40 degrees out or 75. The engine revs drop noticeably when it cycles on. The engine seems to warm up normally and never gets over halfway on the gauge. Once the car is hot, the fan activity seems to be more normal, but still busier than I’d expect.
Why is my air conditioner fan running at high speed?
This problem is often caused by a faulty pressure sensor located on the air-conditioning condenser. If accessing fault codes, there are no relevant DTCs stored in the engine control module (ECM) or signal acquisition module (SAM). • Run a Quick Test to check for any relevant fault codes.
When does the main cooling fan come on?
Should the main cooling fan come on only when the AC is run or when the car reaches a certain temperature? Click to expand… The fans will kick on with the AC and or when the car reaches a particular coolant temp. The AC will come on even if it’s cold outside when you turn on the defrost.
What to do if your car cooling fan stops working?
This is usually a bad connection on the Ect ( engine temp sensor ) so check the wiring / plug connections – to that. Pull the connector off and check the connections – if they are ok, re fasten the connector on…and see if thats stopped it.
How to keep your Mercedes Benz engine running?
Keep your fuel injectors clean and your engine running smooth by regularly replacing your fuel filter. Follow these instructions for a cleaner running engine. Mercedes-Benz engines need constant fuel pressure to run correctly.
What should I do if my Mercedes Benz won’t start?
Start the car and you should be able to get around 60 psi. When the engine is running and when you turn off the engine the pressure should stay steady. Always perform this test on a cold engine. Next, make sure that the fuel injector connections are secure and not loose. Check the fuel pump and the fuel pump relay.
What to do if your Mercedes W123 is bouncing?
Engine having a hard time shutting off? Make sure to check and or replace your injector pump shut off valve. Overload protection relays are located in different places on different chassis, so check for the location of yours and follow these instructions. Car bouncing down the road?
Are there any problems with the Mercedes engine?
Theses engines were more powerful and more fuel efficient. They did have a few teething problems but have proven to be very durable as long as they are treated and maintained properly. A true challenge – but you can do it with the right knowledge.