zvhturbo

I finally got my car fully up and running yesterday, left it running in the garage (heated) for about 2 hours.
The fans were cutting in at about 98 Degrees and cutting back off at about 88 Degrees.

Is this running toooo hot??

Can i get a fan switch to keep the temps a bit lower.

All temp figures were taken from the ECU read out on my laptop so should be dam accurate.

Matt.

B19-TRB

Thats only a few degs higher than mine used to run!

98 was the highest i ever saw after i got things sorted! but i only ran 1 fan!

CraigN

i dont let mine get to 90 lol

on track didnt go over 90 degrees thas on my cossie

and i was ranting it

zvhturbo

The fans cool it from 98 to 88 in about 25 seconds so do a great job, its just the fan switch doesn't cut in untill 98.
Thought that seemed a bit high.

B19-TRB

that seems fine to me m8!

before my car had seen temps of 130deg! this is what happens when u got the wrong water pump on!

stripped i down & the head gasket was mint! replaced it anyway! cheers DOO

Versus_Creations

iTrader: (1)

Change the Thermostat to a sierra type this should cut in the fans before the temps reach 98c

Regards

zvhturbo

I'm using the 82 degree thermostat.

Its the fan switch that cuts in so high.

B19-TRB

I ran a kenlowe fan swtch & u could set that to come in whenever u wanted!

churchy

Thats probably about right. As long as the water don't boil, its fine.

foreigneRS

i would run it cooler. it's all well and good seeing what it does at idle, but you need to know that it's not going to get to hot when on load, ad the earlier you bring the fans in the better.

i would change the fan switch to the cosworth one that comes in earlier (88/77).

see https://passionford.com/forum/viewtopic.php?t=77198

and you're unlikely to boil the water in a pressuried system that contains antifreeze.

zvhturbo

So i want a 88/77 fan switch.

does anyone have the part number. or What model Cosworth does it go on?

Thanks ForeigneRS

Matt.

Jon ERST S2

mine never ever went above 94 degrees. Generally less than that.

foreigneRS

i did have the part number on a piece of paper in my wallet, but must've cleared it out.

it's fitted to all 2wd sierra cossies, don't know about 4x4 and escos as i believe that some models have a 2 stage arrangement on the twin fans (in series for half speed, and in paralel for full speed)

Jim Galbally

fook me my thermostat dont even open till 88degrees

Hardeep_Singh

zvhturbo - put on a 2wd cossie fan switch mate like foreigners said i have done the same, its a straight fit and you will notice the difference in temps but what i find is that once the fan kicks in, the temp never comes down enough for the fan to stop spinning, it hasnt been a problem though just somthing i have noticed, i run a standard erst rad and fan and standard erst thermostat from fords....... mine stays about 1/3 up the temp gauge

Rhys

on the cossie it cuts in at 98C though since fitted my new alloy rad it never gets there unless its been idling for fookin ages!! Can remember with my std rad i only had to be stoped for 1min and the fans would cut in Now with a more powerful engine it runs shit loads cooler!

IMO get new rads peeps makes helof a difference

Anonymous

I saw the title and thought you meant intake temperature!!!

Rhys

LOL now that would be hot

zvhturbo

I have a Pace Ally rad, 2 10" Kenlowe fans and a GRS intercooler.

The fans have no problem cooling the car, its just the fan switch cuts in so high.

Thanks for the help.

I will get a Cosworth fan switch.

Rhys

Cosworth switch I got a new one on mine and it cuts in at 98C reading on secs so might be bit cooler at rad etc?

zvhturbo

Mine is a new switch but i'm not sure for what car, i'm sure i brought a ERST switch, that cuts in at 98 as well, and cuts off at about 88.

Apparently the Cosworth switch should cut on at 88 and off at 77

Anonymous

88 seems like a nice number for the fans cutting in.

Jim Galbally

you could get yourself a nice adjustable one like what burtons/demon theives etc. etc. sell.

also your ECU might have a radiator fan activation facility, quite a few do

that way you can have it coming in/out EXACTLY how you want it

zvhturbo

Yes Jim it does, but i don't know how to do that

I best read the manual tonight.

foreigneRS

what rhys is seeing is because the temp sensor for the secs monitor is the ecu one in the head, and the fan switch is at the bottom of the rad.

of course the water in the head will be a lot hotter than at the bottom of the radiator, that's why you need such a low setting for the switch. the fan switch is put at the bottom of the radiator as it then only cuts the fans in when there isn't enough air movement over the radiator core tocool it. if you put it in the head, or on the top hose, it'd never cool down to the switch off point.

zvhturbo

Both my Rad fan switch and the ECU water temp sensor are right next to each other in the head.

Will my 98 degree switch be ok then??

Jim Galbally

just use the ECU

it'll be one pin to hook up and one setting to change

Jim Galbally

wait a sec, why's your fan switch in the head?

foreigneRS

if your fan switch is in the head, once the engine is under any under load the fan will probably never go off as the thermostat's job is to keep the engine hotter than (in your case) 82 degrees.

zvhturbo

Sorry Jim not directly in the head, my temp sensor and fan switch are next to each other in the thermostate housing, which is bolted to the head.

AndyRST

Fit a 4x4 saff cossie fan switch They work alot lower temp range.

I have kicking about for my RST but didnt get round to fitting it durning the summer and so far havent needed it in the winter.

Rick

uou dont want them running too cold. Fans that come in early are stupid. Running it quite hot at idle is good for the engine.

JesseT

B19_TRB:
Please share the information about the water pump.

AndyRST

whys that rick ?

Thought engines that ran too hot tended to stress hoses, water system head gasket etc ?

Rick

There is more pressure yes, but providing everything is in good condition, it'll be fine. Running an engine hot reduces wear and fuel consumption. If it's running at a decent temperature when crusing, getting hotter in traffic before the fan cuts in is no problem. There is no point having the fan cut in, and it fighting against the thermostat. I run a 92 degree stat in mine in the winter - better economy and hit heater.

AndyRST

just for reference my ST170 runs at 96 ºc

Rick

On my shopping list is a proper water gauge with warning to replace the std guessometer