vk over heating
my vk runs very hot, along the flats its fine but going up a bit of a hill it gets warmer and the steeper the hill the hotter it gets. i have cleaned the raidator and it is still doin it.. any suggestions??
have you internally or externally cleaned the radiator? make sure the belt to the fan is tight, you have coolant, if all else fails, buy a V8 radiator.
Auto / manual? Are you running A/C?
Sounds possibly like an air and / or water flow issue. Try flushing the whole system properly with some decent radiator flush - remember to open your heater valve when doing so. Make sure your clutch fan is working properly and the condensor fan for the A/C (if applicable) is also wroking - A/C can cause all sorts of cooling problems on the old grils.
auto, not runnin a/c. i did clean and flush it wit the good stuff.. and it didnt seem to do alot.
you have'nt said if you checked or changed the thermostat
sound like its a thermostat problem
and i cleaned it internally and externally
how could the thermo be the problem?? could it not be reading right??Originally Posted by commycraz
The thermostat Opens and closes buy temperature manuely ,userly around 87 degree mark ,if its faulty it may not open at all or partially.When cold remove the hoseing the top radiator hose is connect to and take it out. Two ways to test 1. run car without it see if probleum still excists.2.boil water drop thermoststat in see if it opens up and buy how mutch.
the thermostat always gets the blame, when rarely it is the problem.
If the thermostat has failed, the engine would run start overheating after about 10 minutes of driving even on the flats as the engine coolant would not be flowing through the radiator. An easy check if the thermostat is working is to feel the top radiator hose. If the engine is hot, and the top radiator hose is also very hot to touch, then the thermostat is open. However if the radiator hose is only warm/cool then the thermostat hasn't opened properly.
if you've checked the obvious things like radiator, coolant etc.
check the fan. Is it a clutch fan ? If it is, make sure the fan clutch is engaging properly when the engine is hot. If it's slipping, the fan won't be running at optimal speed.
How old is your water pump ? The impeller on old water pump can be corroded/eroded away reducing it's efficiency.
yea i checked all the obvious things, i have got no idea wat a clutch fan is?? does it come standard?? the water pump is aparently (quote the seller) "not all that old"
if it's a V8 or a 6cyl with airconditioning, then yes it should be standard. With the engine off, you should be able to turn the blades freely by hand if it's a clutch fan
difficult to test, apart from feeling & listening to the airflow with the engine revving, but one of the tests I've heard of is with a cold engine turn the fan by hand 5 times. After that the fan should offer noticeable drag or resistance to turning. If not, the clutch is probably not working properly. Also check for excess oil loss around the centre of the clutch
should look something like this - note the finned alloy centre
yea it has a clutch fan then, and it spins, but dosent get any harder to turn even after several turns. would this suggest that the clutch is stuffed/??
Yeah it would certainly suggest that the clutch fan is stuffed. Did you try turning it rapidly? If it doesnt' get harder then your clutch fan is probably stuffed - shouldn't be too difficult to find one at a wreckers or ebay.
yea i spun it as fast as i could and it rolls for bout 1/4 of a turn to stop.
In that case I would say your clutch fan needs replacing.
If your car overheats while moving or at highway speeds i would suggest that your radiator is clogged internally and doesnt give the optimum performance when its needed as the fan doesnt do anything while your moving along its only to keep the air flow while your at slow speeds, at idle, in traffic etc.
You have a very good point. I put new bigger 3-line radiator in my VH with a great big f*ck off electric A/C condenser fan and it worked wonders! So yes not only does your clutch fan sound stuffed but you may not be getting decent water flow due to your radiator being calcified. In addition, as DarrenL mentioned your water pump may not be pumping well either. Best thing to do is process of elimination.....
yea good point, by process of eleminination, replace the water pump first??
captain halfajob
why not try and unblock your radiator first? its the cheapest option. you can see if your pump is pumping water. cos it flows through the rad. just watch it with the cap off. or if your feeling game, take one of your heater hoses of and start her up. i know its gonna sound a bit weird, but how is your transmission? topped up with fluid and shifting gears nicely? your engine temp will go up when your trying to push a stuffed transmission up a hill.
fan still engages when the car is driving around town, especially at lower road speeds, high temp days, higher engine load (eg driving up a hill)
So don't rule out the fan.
You can buy a new clutch for the fan from the likes of Repco. They aren't that expensive from memory
You can always pull the water pump off while the radiator is out and inspect it, but you will have to make a new gasket or buy one. you could use some sort of silastic but be careful as it may cause it to glue on and make it extremely difficult to remove next time. It can be very hard to tell if your radiator is clogged up internally as mine was and it would seem to empty out nice and fast and all but after i got a new one i took a tank off to find the core full of flakes of block.
turns out that the timing was a bit out.. it only gets half as hot now.. but it still gets rather warm..
australias driving future
water pump? thermostat? block in cooling system? split hoses making air pockets in system?
Last edited by sam5l; 27-03-2010 at 12:34 PM. Reason: spelling error
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