lukeytheduke

How come my cooling system does not kick in when I do not go on boost?? I’ll explain more now for you all, in the morning, I leave the car running for 5 mins, then I drive slow under 3.5k revs, however, the cooling system does not kick in and it begins to over heat, this is a nightmare if you are stuck in traffic when you first set off!!

However, as soon as I hit boost, the fans kick in and it cools down, but why does it not kick in if im not on boost??

I would love to know your opinions

CheeRS

Joris_FRST

weak thermostat ?

or waterpump of course, don't know how this is connected on a cosworth.

SS1

iTrader: (3)

lukeytheduke

whats the spec on you engine ??

my car starts to burn up in traffic jams 10 mins before a move

the last owner converted the ac switch to the fans

push the switch ..it goes down to about 76 - 85 at the most

nice conversion

lukeytheduke

its only a stage one, k&n breather, mongoose exhaust, chipped.

weak thermostat......

waterpump, wouldn't it either work or not work?

Some peeps must have an idea!!

Thanks for the ideas so far but can someone confirm them??

RichieST

iTrader: (2)

no idea about the overheating, but leaving it idling for 5 mins before driving off is probably doing it more harm than good!

RS500/364

check the fuse box maybe these a lose wire when you boot the car moves makes contact !!

short out the themo switch to cut in the fan then if ok go from there !!

RichieST

iTrader: (2)

well he says when driving slowly, it overheats, and the car shouldn't need the cooling fan if it is driving steadily. Could be a knackered waterpump, i.e it needs a lot of revs to get it to pump decent amounts of coolant?

lukeytheduke

That makes sence to me mate

RichieST

iTrader: (2)

well, change the thermostat first, see if that makes any difference, then i would suggest waterpump!

S3an

if it has a swirl pot, remove header tank top and see if water is been pumped around. mines like a hose pipe normally(lot of force) when you see where the swirl pot pipe goes into the water header tank.

lukeytheduke

This problem did actually only start around the time i fitted by baileys header tank and swirl pot,

so you think it is the swirl pot not circulating the water properly?? Should this happen seeing how much you pay for them!!

gingeRS

false economy if you ask me, i see no point to having a swirl pot

the standar system design is more than up for the job of cooling the engine

i'd take it off, flush the system fit a new thermostat and 50/50 antifreeze and see if hat does the job

stick the swirl pot on ebay....you dont need it

lukeytheduke

Is this true what ginge says? i thought you needed it to cope with higher spec engines, but mine cant even cope as a stage one power enginering conversion

gingeRS

well mine is a stage 3 and copes just fine

if anything its a little too effective as it takes ages to warm up (as this affects the fuel economy as its closed loop), but this may be cos it sgot too much antifreeze in it

you'll fine the majority of people here will tell you they do very little

lukeytheduke

i brought mine to get the air bubbles out of the system and back into the header tank!!

So do they not do this then??!! Come on peeps, is ginge right??

gingeRS

if you bleed the system properly in the first place it shouldnt have any bubbles

this is easy to do on a 4x4 as there is a little screw in the top of the thermostat housing

see below:



dunno how you bleed a 2wd though?

i was quite suprised the system doesn have a self bleed that returns to above the water level, like on my old S2

lukeytheduke

so my 2wd doesnt have one then!!??

gingeRS

dunno about the 2wd

theres prob a simple way of bleeding it

lukeytheduke

cheers ginge, helpfull as ever, 100 quid for the swirl pot on fleabay

lukeytheduke

upski