Can you blank this off?

[scullyg40]

Normally, this goes to the heater matrix. As I don't have a heater any more, and I changed my coolant system, I thought I could just blank of off, forcing more coolant through the main system, increasing coolant capacity. I had it looped before.

Yesterday, my blanking cap blew off because of pressure I suppose. My question is, can you even blank this off, or does it always need a bit of flow, or a way to reduce pressure here?

It is the start of number 7 in The drawing below.

 

[dann2707]

Can you not just feed it into radiator bottom hose outlet?

 

[scullyg40]

Can you not just feed it into radiator bottom hose outlet?

I already decided I'll feed it into the reservoir drain, as it's closer, but it's basically the same.
I'd just like to know if it's even possible what I did, or if I made a mistake.

 

[dann2707]

It's very surprising, how tight was the plug? What did you use to blank it off?

 

[hostler]

@scullyg40
Found this post:

Removing the heater...couple of questions

So I removed the lower dash on my track Clio the other day in the pursuit of weight saving. The intention was to retain the heater for demisting etc...anyway, ignore whether or not I should remove the heater. I have questions: Does anyone know the weight of the heater system including matrix...

cliosport.net

 

[scullyg40]

It's very surprising, how tight was the plug? What did you use to blank it off?

I assume it was tight enough. I've used a blanking cap, specifically meant for this.

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What I can think of is that as long as the thermostat is closed, coolant has nowhere to go, building up pressure?

@hostler How it's done in the topic you mention is how I had it before, and what I will be going back to. However, it doesn't explain why it has to be done this way, or if blanking off is an option.

 

[dann2707]

I assume it was tight enough. I've used a blanking cap, specifically meant for this.

Welkom bij Biesheuvel Autosport

Biesheuvel Autosport is al 60 jaar dé toonaangevende leverancier van race-, rally-, cross-, Dakar- en karting benodigdheden van Nederland. Wij zijn gevestigd in Nieuwendijk (Noord-Brabant) nabij de A27. Wij staan sterk door onze service en grote voorraad direct leverbare artikelen die wij in...

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What I can think of is that as long as the thermostat is closed, coolant has nowhere to go, building up pressure?

@hostler How it's done in the topic you mention is how I had it before, and what I will be going back to. However, it doesn't explain why it has to be done this way, or if blanking off is an option.

Ahhhh makes perfect sense now I've had a look at the diagram again. Yeah when the ts is closed the coolant will be going around the heater matrix, goes into the bottom hose then back around the engine until it opens.

So blocking it off makes it not able to go around the engine at all as there is no return.

 

[scullyg40]

Ahhhh makes perfect sense now I've had a look at the diagram again. Yeah when the ts is closed the coolant will be going around the heater matrix, goes into the bottom hose then back around the engine until it opens.

So blocking it off makes it not able to go around the engine at all as there is no return.

Thought so. Already had my doubts when I did this, but because I did lots of other things like the cambelt and the gearbox, with little time, I never thought again about researching this up front. I basically forgot about it. 😆