Tip & How-To about Cars & Trucks
So you flush the radiator, you change the thermostat in your vehicle and it still overheats. Or perhaps your heater doesn't blow hot air in the winter when you really need it?
You need to make sure the radiator and heater matrix (a small radiator made of plastic) is full of coolant with no air pockets. People get confused with filling the radiator and filling the overflow reservoir. There is a cap on the radiator, remove it and top it up, run the engine and keep topping it up. Also make sure that your HEATING in the car is on FULL heat and FULL fan. Squeezing the radiator hoses will help to dislodge air. The level will rise and fall when the thermostat opens up. Rev the engine a bit, top up one last time and when there are no bubbles and the opening is full, replace the radiator cap. Turn the engine off and then top up the overflow reservoir. Use antifreeze mixed to the manufacturers specs, usually 50/50. Please remember antifreeze is poisonous to humans, children and animals so wear gloves, don't ingest it and store it safely.
There is also a gadget that you can screw into the radiator cap to keep a head of coolant as the bubbles are coming out and stops spillage onto your garage floor or driveway.
Have a look at some of these videos.
Posted by Andrew... on
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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