Why does my HVAC fan make a clunking noise?
A powerful fan can also cause the same noise by bulging out rather than in sheet metal components on the supply side of the heating or cooling system. Once the sheet metal has been bulged out by the pressure of supply air, when the blower fan stops we may hear a second BANG or CLUNK noise.
What causes a loud knocking noise at the crankshaft?
Excessive crankshaft end play is indicated by an intermittent rap or knock sharper than a worn main bearing. The following are causes of main bearing noise: Low oil pump pressure. Thin, diluted or dirty oil and/or filter. Excessive main bearing clearance. Excessive crankshaft end play. Out-of-round crankshaft journals. Loose crankshaft pulley.
What are the symptoms of a bad cooling fan relay?
1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
Why are the cooling fans not working on my car?
1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Average rating from 129,472 customers who received a Vehicle Engine Cooling Inspection. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.
Why does my car engine make a loud noise when I Turn on the fan?
Check your cooling system for airlocks and check that your heater Matrix has coolant (car heater) by turning on the fan when the engine is warm, this gives a good indication of an air lock in the cooling system.
Why does my 350 engine make a noise when cold start?
On the 350 engine you have an air pump that works with the EGR cold start system and its all related to temperature. For the first few seconds/mins after first starting (dependent on outside temperature) the pump will kick in and it is a little noisey. Maybe this is what you can hear, if so, its normal.
1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
Many other issues can cause the engine to run hot or overheat. Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running. A faulty or broken relay cannot deliver power to the cooling fans. In turn, the unpowered fans won’t run, leaving the radiator to its own devices.