College Assignment

[Mellkat86]

Hey all,

I'm writing up my college practical I did yesterday, removing a radiator and replacing it. I've writen the thing up already, just need some technical data on a 1991 Volkswagon Golf. I just need to know what the cooling system operating pressure is? I'm guessing it gonna be something bar/psi, maybe 4 or something... But I don't wanna guess.

So thanks for anyone who can help!

[danthevan]

What engine?

[danthevan]

book of lies says expansion cap opening pressure is 1.3 -1.5 bar

By the way, how have you written up about bleeding the system?

[Mellkat86]

All we really have to do is just briefly go over what we did. So for bleeding the system I mentioned about bleeding the air from different points around the engine and then ran the car with the bottle top off, so the air could escape.

It doesn't really matter what engine size it is, cause the cooling system stuff would be standard for all cars. It just be an average really.

So if the expansion cap opens at 1.3 to 1.5, would that make the pressure for the system be about the same? Or a bit lower?

[danthevan]

The diesel's have higher pressure cap available, that's why i asked.
It's hard to say what the operating pressure will be as it will vary with the temperature of the coolant, but if the relief valve goes at between 1.3 and 1.5 that's what your operating pressure will be around.
I suppose the higher the temperature, the higher the pressure will be, and with a 79 degree and 85 degree thermostat available too, then you have to throw that into the mix somewhere too .
Been a while (19 years ) since i had to do the same assignment

Oh, and as for the bleeding, the only way to do it on the mk2 is coolant cap off, keep it filled to the brim with engine on tickover, let the stat open and overflow the coolant bottle, then turn off engine and top up as required.

[Mellkat86]

Cool. I've put about that, the 1.3 to 1.5. Found a haynes manual download online and it said about that. It ain't gotta be exact as they just want to see that we can look things up and such.

[danthevan]

What course is it you're doing?

[Mellkat86]

I'm doing level 2 mechanics. Completed level 1 last year.

[danthevan]

City and guilds? (or is that a thing of the past now?!)

[Mellkat86]

Last year it was City and Guilds, its somebody else this year. Someone who specialises in just mechanics. I got the details for it somewhere. They gave up on City and Guilds cause it was too much paperwork. My group, there's another level 2 group, are guinea pigs for the new electronic portfolio, makes it easy for me. Can do all my write ups at home.