GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: Gti_Jamo on 29 September 2012, 18:23
-
Got myself a VR6 the other day and noticed that the coolant temperature would not rise above 70 - 75 degrees when driving but hits and stays at 90 degrees when stationary. Takes ages to warm up. Also getting a coolant smell through the heaters while stationary. My first thought was the thermostat but changed that today and its no different. Car still drives fine, the coolant level remains the same, no leaks etc but assume it will be using too much fuel if its not at optimum temperature. The car is a 1992 model. Any advice would be appreciated as really want to try and sort it out.
-
Maybe your new stat is duff.
-
No when sitting idling from cold the bottom hose remains cold until it gets up to around 75 - 80 degrees then it becomes hot which tells me its working fine. The problem only arises when moving, Temp drops right down as does the heaters. Its a strange one like for sure.
-
You may have an air lock?
-
I did think that but when refilling with coolant I filled it through the top hose until it appeared in the expansion tank. Then ran it for a bit with the cap off whilst squeezing the hoses to expel the air. Would an air lock not cause overheating rather than under heating. Like I said its all fine when stationary, just when moving.
-
The way ive always bled my system is to fill it up through the expansion tank, leave the cap off untill the fans kick in. Put lid on and all systems are go. Maybe replace your have waterpump if you dont paperwork to prove its been done?
-
Maybe see bout getting the pump done. I'm maybe thinking something is up with the heater matrix given I am getting a coolant smell on idle through the heaters. Goes away as soon as I start driving. Doesn't appear to be any leaks or wet carpets though.
-
This is not right to me ,an air lock would cause overheating,a bad water pump would not cause overcooling,could the temp sender be reading wrong,there could be a small leak anywhere on the system and the coolant smell could come through the vents.
-
He has a vr6... the waterpump is a piece of mind job :grin:
-
Ah :grin:
-
Its just that the temp drop is felt through the heaters aswell so doubt the sender is at fault. There is definately a smell of coolant when stationary though. But even if there was a tiny leak somewhere, it would explain the huge drop in temp. Need to get sherlock holmes on this one. :grin:
-
I must add also that when I picked it up on tuesday it sat around 70 degrees all the way during the 80 mile trip but yesterday when sitting in traffic, the first time I had it at 90 degrees, the thin coolant line that goes from the throttle body to the heater matrix hose split and lost most of my water. Luckily i managed to fix it as was near a motac to get some pipe. Not sure if it was caused by overpressurisation or was just a weak link in the system. It failed where I beleive the small jubilee clip was diggin in to the rubber.
-
Anyone have any more info on what may be causing this problem? Spent about an hour or so today trying to bleed the system. I believe some air came out as I had to replace some coolant but it was minimal and still drops to around 70 degrees when driving.
-
The temp sensor in the rad!
Mine has similar issue won't go above 70 ish over fueling like mad! the oil sits at the normal 90c
I think my stat is shot though but not 100%
I read that the temp sensor in the rad and lambda control the fueling
-
The temp sensor in the rad!
Mine has similar issue won't go above 70 ish over fueling like mad! the oil sits at the normal 90c
I think my stat is shot though but not 100%
I read that the temp sensor in the rad and lambda control the fueling
The gauge sits bang on 90 when sitting though and the oil hovers around 90 regardless of water temp. There is definately a reduction in heater temp. Iam feeling air bubbles in one of the hoses going to the matrix when its running but nothing i did improved the situation. it also takes ages to warm up on first start. New thermostat made no difference.
-
When on tickover what temp do your fans kick in ? i know you say your stat is working but if i was you i would take it out again and check it. could be stuck partially open,i seen alot of new stats over the years that are faulty
-
When on tickover what temp do your fans kick in ? i know you say your stat is working but if i was you i would take it out again and check it. could be stuck partially open,i seen alot of new stats over the years that are faulty
Fans come on bang on 90 when sitting. Stat appears to open at 80 degrees on two seperate cold starts i've checked. No real way to check to see if its closing under pressure. Could do with one of those laser temp meters.
-
Removed and checked the thermostat, checked all the pipes and flushed the system and still drops down to 70 degrees when driving. Its cooling to an extent that when ive been on a run the thermostat is closed when I check it, pipe is cool to the touch. I'm thinking the radiator is too efficient or the car. Also noticed my aux water pump does not kick in once the engine is switched off. Fookin nightmare!! :cry: