car over heating but the coolent not hot

[Vs_Esteem]

hi all i drive from happy valley (sa) to cherry gardens and the car got near half way on the temp gauge,it normaly sits on the 2nd line from the cold,i popped the hood check for leaks & didnt find any,check overflow and it was still right but when i touched the radiater cap it was cold,it wasnt normally hot or what it usauly is,anyone had this problem or know how to fix it,its a vs series 2 auto,anyone help ?

[88GreenVN]

Originally Posted by Vs_Esteem

hi all i drive from happy valley (sa) to cherry gardens and the car got near half way on the temp gauge,it normaly sits on the 2nd line from the cold,i popped the hood check for leaks & didnt find any,check overflow and it was still right but when i touched the radiater cap it was cold,it wasnt normally hot or what it usauly is,anyone had this problem or know how to fix it,its a vs series 2 auto,anyone help ?

Could be the thermostat jammed or an air lock in the cooling system. If you have not been loosing coolant - I'd check the thermostat

Also you could check to see if the fans are cutting in when they are ment to.

[Classifi3d Calais]

half way isnt really over heating

[Vs_Esteem]

yea i know it not overheating but its not usally that hot,i have been loosing a tiny bit off coolent sometimes from the overflow bottle,how much are thermostats,cant see any leaks how ya check if ya got a air lock or get rid of it.

[88GreenVN]

Originally Posted by Vs_Esteem

yea i know it not overheating but its not usally that hot,i have been loosing a tiny bit off coolent sometimes from the overflow bottle,how much are thermostats,cant see any leaks how ya check if ya got a air lock or get rid of it.

At running temp can you squeeze the top radiator hose?

[Vs_Esteem]

um i touched it the other day & it was hot,but didnt touch it today when the temp went up just touched the cap n coolent,the temp trouble has only just started.

[Vs_Esteem]

you can push the top radiator hose in a little bit.have your had this trouble b4 greenfoam ?

[88GreenVN]

Originally Posted by Vs_Esteem

you can push the top radiator hose in a little bit.have your had this trouble b4 greenfoam ?

If the car is under temp stress (getting real hot) the cooling system is under lots of pressure and you can squeez the top hose all that much.

So the car probably is not over heating - so maybe the thermo fan is not comming on when it's ment to.

[Vs_Esteem]

when we brought the car i think the previous had some over heating trouble because they unhooked the fan wire and tapped into the fuse box so when u turn the key to accesseries it turns the fan on flat out,so its always going but flat out,iv gone and seen a mechanic and they said its ok but the fan is just gonna wear out fast,i been wanting to get it fixed but they say its alright

[88GreenVN]

Originally Posted by Vs_Esteem

when we brought the car i think the previous had some over heating trouble because they unhooked the fan wire and tapped into the fuse box so when u turn the key to accesseries it turns the fan on flat out,so its always going but flat out,iv gone and seen a mechanic and they said its ok but the fan is just gonna wear out fast,i been wanting to get it fixed but they say its alright

You got it - if the fan goes all the time - it'll be buggered in no time flat.

The VS if not bleed properly will get air locks and have over heating problems (pockets of air). There is a small bleed screw on top of the thermostat housing and this should be use to get all the air out of the cooling system. Also when bleeding the heater should be turned on to help get all the air out.

So if they had air in the system and having a temp guage crackin a spaz all the time they may have thought having the fan on all the time would fix it.

[Vs_Esteem]

ok thanks mate,yea its stupid how the fans always going,is the small bleed screw hard to find,do i start car up and turn heater on do i take the bleed screw right out or just a little bit.

[88GreenVN]

Originally Posted by Vs_Esteem

ok thanks mate,yea its stupid how the fans always going,is the small bleed screw hard to find,do i start car up and turn heater on do i take the bleed screw right out or just a little bit.

The bleed screw should be ontop of the thermostat housing (top hose will connect to this)

From memory the scew has a lock nut too - just crack it open to see if any air comes out. Wont be much - but it dosen't take much air to get a spike in the temp gauge. (coolant raises the boiling point by a fair bit so when it hits air it can bump the temp guage up