According to the manufacturer's recommendation, the coolant should be replaced after two years of operation or after 60 thousand km, whichever comes first
If the coolant has changed color to red, replace it, as such a change indicates that inhibitory additives have been developed and the liquid has become aggressive towards parts of the cooling system.
You will need: a container for drained liquid, a funnel.
Replacing the coolant of a Gazelle car with a ZMZ-402 engine
We install the car on a horizontal platform.
Open the heater tap using the control knob on the instrument panel.
Open the cap of the expansion tank.
If necessary, put a hose of a suitable size on the radiator drain valve, open the valve and drain the liquid into a container with a volume of at least 10 liters.
Drain the liquid from the cylinder block in the same way.
For easy access to the heating system hose, loosen the clamp and remove the upper radiator hose from the thermostat cover fitting.
Loosen the clamp and remove the heating system hose from the pump pipe (on the right side of the engine) and, directing it into a container, drain the coolant
For ease of work, unscrew the five screws and remove the hose casing on the floor of the driver's cabin.
Unscrew the two screws securing the auxiliary heater casing and remove the casing.
Using a slotted screwdriver, loosen the clamp on the upper radiator pipe of the additional heater.
Remove the hose by holding the hole with your finger
Pulling the hose out from under the seat, drain the liquid into a container
In the same way, remove the lower hose from the heater radiator pipe
Drain the fluid from the auxiliary heater radiator.
Having connected all the hoses, fill the system with fresh coolant.
After starting the engine, we make sure that there are no air pockets in the system and no overheating of the engine.
If there is an additional heater in the car, after starting the engine, turn on the electric pump.
Replacing the coolant of a Gazelle car with a ZMZ-406 engine
All work should be carried out only on a cold engine.
Unscrew the expansion tank cap and open the heater tap.
We put a hose of suitable diameter on the drain tap pipe.
Having lowered the hose of the radiator drain valve into a container (with a volume of at least 10 liters), open the valve and drain the coolant.
Remove the hose from the radiator tap
Putting it on the tap located on the left side of the engine, drain the remaining coolant from the cylinder block
Close the drain taps
We fill the system with water through the expansion tank.
Start the engine for a few minutes.
Drain the water and fill it with fresh water, rinse the cooling system again.
To avoid spilling liquid, insert a funnel into the expansion tank and slowly, in a continuous stream, pour coolant into it.