Temp issues

[easty-5]

Basically the car used to overheat on long journeys. I found out it was because the rad cap was dumping all the coolant out as it was sealing. New rad cap on an no more overheating, infact, the opposite. When I accelerate hard the temp needle goes down to about 1/4 then climbs back up again. Changed thermostat today and bled the system and no change. It still does it.

Anybody have any idea's as to what is causing this?

Cheers
Jamie

[easty-5]

Bump

[easty-5]

Morning bump

[Marf]

Odd mate, sounds like exactly the same symptoms I had when my thermostat was stuck open, but you've changed yours

Could try giving it another bleed to see if that makes a difference.

[gw_mr2gtt]

Definately sounds like it needs another bleed.
Mine went through a stage of doing this, found a leak, fixed it and then had to bleed the system twice before it returned to normal.

[easty-5]

Odd mate, sounds like exactly the same symptoms I had when my thermostat was stuck open, but you've changed yours

Could try giving it another bleed to see if that makes a difference.

Yup. I tested my old thermostat and it was fine. I just find it strange how it used to overheat, I changed my rad cap and now it does the complete opposite.

If the HG was gone could it cause that? I would have thought it would overheat.

I will give it another good bleed over the weekend? Is there any, good, detailed guides on the best way to bleed the system?

[Marf]

No I doubt the HG is the culprit here.

Re: bleeding:-

heaters on full hot
Rad cap off
Open bleed on bottom of radiator and two metal coolant pipes under the middle of the car
Let coolant drain out
Close off bleed points
attach service hoses to top of rad and heater matrix bleed points(open each one a couple of turns)
Fill up as much coolant as you can get in
start engine
add more coolant as level drops(thermostat opens allowing what you've added to circulate)
once all the air is out via the service hoses and the coolant level in both is at the same level as the coolant filler neck, nip up bleed points. You'll probably need to rev the car a bit to make the coolant circulate and push out all the air.

rad cap back on and go for a drive.

I tend to then let it cool down, check coolant level again and add as necessarry

[easty-5]

Do you do this on a flat surface or jack the rear of the car up?

[Marf]

I did it on a flat surface, though I suppose draining would be more complete doing it with the rear jacked.

[easty-5]

I don't particulary want to drain the coolant as I drained it yesterday and topped up with new Halfords advanced coolant, so it would be a waste of £20.

I heard, can't remember where, that if you jack the rear up it helps puch the air to the front. How true that is I have no idea.

[Marf]

Think about it, if you jack the rear of the car up, the air will go to the highest point, which will be the rear

[easty-5]

Think about it, if you jack the rear of the car up, the air will go to the highest point, which will be the rear

Very true. It's Friday, I try to do as little thinking as possible

[Tom-os]

Hi guys.
Been having some trouble with my coolant on my Rev2 turbo that is starting to become a nightmare to solve
I noticed you've said about opening the two metal coolant pipes under the middle of the car, do i have these on my Rev2?
Also do i have a bleed on the bottom of my radiator as i was only aware of the one on the top?
Tom-os

[dantheman]

they have them as standard. they are known as the pipes from hell. its quite common for them to corrode. instead of replacing them some people just put in new rubber hoses and remove (or leave) the copper ones. so you may not have valves on them to use. if this is the case jacking the rear up will be quite important.

Open bleed on bottom of radiator and two metal coolant pipes under the middle of the car
Let coolant drain out
Close off bleed points

slightly misleading. they arent bleed points they are drain points.

the only bleed points are at the top of the radiator and on the back wall of the frunk.

[Tom-os]

Alright then, i'll have a good look tomorrow to see if i have got these bleed/drain valves and i'll jack the rear up and have another go at bleeding the system.
Hopefully this will work as i have read about these hoses from hell and really could do without having to deal with them