L1AM_RS

Hi,

For a while i've been suffering with cooling system issue's on my 2wd saph.

Basically when the car is sat lets sat at traffic lights or light traffic it doesn't take a minute or so for the temp to rise and fans to kick in. On an average drive they constantly are kicking in and out.

I have a lower temp green radiator fan switch and a MSD thermostat.

I have good flow around the system. The radiator is aluminium and everything is new as i rebuilt the engine and have covered 800 miles since rebuild.

Initial thoughts was the head gaskets gone or something.

I've done numerous compression tests which have all held the pressure with no leaks on the gauge across all four pots and are around 145 - 150psi.

I've removed the spark plugs



Genuine cosworth waterpump. All coolant pipes are new.

No coolant loss and i've tried to bleed the system numerous times for air. Car pulls fine.

I've head the stat out numerous times and replaced

If i open the expansion tank after a run there are alot of bubbles that come into the header tank from the turbo return hose.

It's doing my f*cking head in now.

I've taken it to a VERY reputable tuner who told me the coolant flow was running too fast around the system and they have installed a re stricter?? However its just doing the same.

Is it normal to have the fans kick in so early? I know the weathers hot but

boostn_capri

Hi mate, are you sure its flowing correctly? I aint a mechanic but how has he tested that its flowing too fast? it should be cooling it too much not heating it if it was flowing too fast.

The uprated fan switches come in at a higher temperature to cater for the heat sink on the alloy rad tanks, which points to it heating up too quick/flow problems.

It might be worth taking the radiator out to have a check its not blocked by a radiator specialist. The standard ones collect sludge in corners where the fan switch sits. I would also considering checking the thermostat again by testing it by boiling it in a jug to rule it out, I have purchased new ones before that havent opened correctly. And lastly if the water pump isnt new might be worth checking the vanes havent disintergrated and that its a proper cossie one and not a sohc one.

Also if you can get a heat temp gun, you could try point it at rad / expansion tank to figure out where its hot / not hot.

Hope that helps,

Kane

AndyPen

iTrader: (24)

For what it is worth mine gets pretty hot too - but checked it all out and I think it is down to the hot weather - the moment we have air movement through it when we get going or or the bonnet is lifted when stopped, it cools.

kosienutter

I get bubbles when I have refilled the system after a coolant change running the car up to temp with the header tank cap off to make sure there is no air in the system and bleed off occasionally at the little nut infront of the thermostat then put the cap backnon once I am happy its clear. Sounds like there maybe still air in the system maybe. I know yours is 2wd and the thermostat plumbing is different but give it a good run getting as much air out as pos. Helps giving the pipes a squeeze too I think.

But then again it is hot weather at the mo.

L1AM_RS

Cheers for the input mate. Answers are below in red

L1AM_RS

How quick does the temp gauge go up tho buddy?

L1AM_RS

Cheers for the input

kosienutter

No worries.

AndyPen

iTrader: (24)

Tested it again yesterday and takes a good while to get really hot - about 15 mins.

I took the fuse out of the fans and let it go up a bit more than usual... then waited a good 5 mins to watch the gauge drop ever so slowly... then opened the bonnet and it dropped at three times the speed.

I also have a direct capillary gauge by the way - the sender is in the block so I was looking at that gauge too.

Not sure if this helps much?

Andy

saphcoz31

Mine is exactly the same I'm running different thermostat msd fan switch alloy rad, swirl pot going by my secs fans kick in at 90 degrees whether I'm driving at 60mph or stationary really is annoying I put it down to the rs 500 intercooler restricting the air flow cannot fault anything else the recent hot weather hasn't helped the fans are in and out all the time.

raggey

Could i just ask a daft question, how can you tell the difference between a cosworth and a sohc water pump, only asking because when a bought my engine it was in bits in a box and i wouldnt know the difference between them, and i have always thought it runs a bit hot
paul

boostn_capri

Hey mate I posted a few pics on this other thread...
https://passionford.com/forum/showthread.php?p=6411465#post6411465

2Litre

These cars get hot, its 37c in my world and I have every cooling aid possible short of airconditioning the bugger.
Could be nothing wrong other than ambient temps and the way its driven.


T

2Litre

Your thermostat will always kick in at 90 degrees if its rated as such !!!!!!!!!!!!!!!!!

T.