Talldog1969 wrote: ↑Wed Aug 25, 2021 8:46 am
When we come too refill with fresh coolant is it just a case of reconnecting the pipe that we drained the radiator from and the refilling via the expansion bottle?
Unfortunately, no.
You should create a "header tank" to increase the pressure in the system and make it easier to expel excess air. Without it not much coolant or air will come out.
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There are two bleed points for the cooling system. One is at the firewall where the heater hoses go into the cabin.
The other is on the thermostat housing. Its in the middle of the air filter box mount. It looks like an Allen key cheese head screw but it has a bleed hole in it.
Reattach the bottom hose and fabricate the header tank. Remove the air filter box. Fill the header tank with coolant until the engine stops filling up. Remove the little cap on the heater hose on the fire wall. A frothy mixture of coolant and air will come out. Top up the header tank if required. Let the coolant come out until there are no more bubbles. Put the cap back on.
Unscrew the cheese head screw on the thermostat housing until a coolant/air mixture comes out and stop unscrewing (don't pull the screw all the way out). Top up the header tank if/when required. Bleed the system until only coolant comes out, screw the screw back in.
Siphon out the excess coolant from the header tank AND expansion tank down to the 'full' mark on the expansion tank. Replace the expansion tank cap.
For the next few (driving) days check the level of coolant in the expansion tank and top up if required.
Remember the coolant is poisonous and bad for the environment.
