Engine Cooling System - water flow

[Counterdoc]

Hi,

i need some help understanding this operating diagram:




1 = Engine
2 = Cooling radiator
3 = Heater radiator
4 = Expansion bottle
5 = Coolant pump
6 = thermostat
7 = Bleed screw
8 = Engine oil cooler


What is the water flow direction if the thermostat is closed? Only over Nr. 3 (1 - 3 - 5 - 1)?

What would happen if i remove Nr. 3 and block this circuit? I have no stock heater inside the car (rallycar).


Thanks,

Marius

 

[Foxspeed]

no3 is the heater matrix that's in side the heater/ventilation behind the dash

 

[Daverb]

Don't block the circuit - joint the 2 pipes together so water can still flow round circuit. Bit pipe - 2 jubilee clips - done.

 

[Counterdoc]

okay thank you!

 

[J90RDN]

Sorry for there post resurrection, but why can't the pipes be blocked off? Why does the water still need to circulate?

 

[Northloopcup]

Sorry for there post resurrection, but why can't the pipes be blocked off? Why does the water still need to circulate?

If the water can't circulate, it will cause the pump to cavitate and introduce air bubbles into the cooling system.

 

[J90RDN]

Understood - Going to see if it's possible to join the lower pipe directly to the back of the thermostat rather than linking them both with a 180 deg bend.

 

[Clarki99]

Hi - I have already just done the same thing with my track car and removed the whole air distribution unit - I cut the pipes in the engine bay that lead inside the car to heater matrix and then I used alloy blanking plugs. I haven't joined the pipes as didn't think this would be an issue given it is just water flow for the heater. However Northloopcup has got me a bit worried with his comment. I haven't run the car yet as it is still in bits.

So have you resolved this? I was thinking about a 180 connector to join the two pipes but couldn't find any small enough as the pipes are fairly close together.

 

[J90RDN]

I've ordered a 180 Deg alloy pipe from ASH on eBay - was about £9 delivered.

 

[Clarki99]

I am doing the same but slightly different way. Just ordered a 180 deg silicone connector and some alloy tube and I am going to join them that way, as because I have cut them shorter already I don't have much gap between the two pipes so need a tighter radius connector. Silicone looks tighter radius than the alloy one.