Reply With Quoteredandy
Is it possible that your temp gauge is reading incorrect, ie the sensor is stuffed? Especially since it started increasing on the downhill run.
Gary
Master
Well where can i start............
Swapped over the radiator, put a new thermoclutch and fan in, new thermostat, flushed the entire cooling system, checked electrosysis & brand new coolant, all in all the problem still excist in overheating. Took it for a test drive, and within around 10 kms from leaving home on the freeway the temperature creeped up into the red.
First thoughts were maybe some air left in the system, so slowly released the pressure from the expansion tank with bubbles shooting out from the bottom hose even when the engine was off. Poured another 2 - 3 litres of coolant in after the remaining coolant got sucked back out of the expansion tank when the bubbling stopped, all was good then and temperature returned to normal. Continued driving with the right eye constantly on the temp gauge as we drove into a small town where the roads were a bit hilly and good test the cooling again.
Driving uphill the temp remain good with no signs of overheating. Then driving back out of the town downhill we speed up to around 100 km/h then shortly after the temp began to climp again. Before it had a chance to spike into the red, i pulled over and switched the engine off, hopped out and checked the coolant level, all was still good, but pressure did build up again with bubbles bubbling out of the bottom hose of the expansion tank. By this stage i was getting suspicious of the condition of the engine, had i blown the gasket?
Waited 10 to 15 mins then continued on, as the temp again climbed. I then put the transmission into neutral while on the move, and gave the engine a good rev, the temperature then slowly moderated again. I managed to limb the vehicle back home with the temperature being a little erratic until i pulled up in my driveway with the temperature back in the red.
Now trying to diagnose the symptoms, would you all say that 1.) the head gasket is leaking? 2.) possibly water pump failure 3.) Trapped air in the block? 4.) the ultimate, cylinder liner slipping with either a cracked head or block??
So far it's not looking good!
Got me a bit stumped.
Wizard
Supporterredandy
Is it possible that your temp gauge is reading incorrect, ie the sensor is stuffed? Especially since it started increasing on the downhill run.
Gary
Master
Thought about that. But also found when speeding up to 100kms it started overheating, and when i stopped, coolant was spewing out of the radiator cap under pressure. I just did a spark plug check, and noticed one of the plugs was hard to get out, though the plug itself did not indicate wetness, but the thread was corroded.Originally Posted by mtb_gary
Can the heads crack in the spark plug threads? ( like in the VW Beetles?)
ChatterBox
Hi
I have the same madness going on and I am blaming the thermostat, I used a laser temp gauge and there was a big diff between top and bottom hoses when they should have been the same temp. New thermostat going in on Sat I would not trust one until it proves itself!
Also how long since your water pump was changed?
Steve
Master
Same issues and checked as Steve with the thermostat gun .....as said before third thermostat fixed the overheat issue...and redandy, is your pressure cap in good condition,I believe that original OEM is the best way to go.....just a thought?
AT REST
If the water pump is cactus, the coolant will boil, build up pressure in the system and spew out in a horrible way!
If it's the only thing you haven't done and are clutching at straws, that's where I'd be looking! As much of a P.I.A as it is!
Could also be the cap or thermostat (as mentioned above). Take your pick!
I remember the water pump going in my old red 6 in the Torana. I didn't run a thermostat in that motor so I popped open the radiator cap when the engine had cooled to check if there was flow with the engine running. Low and behold, my first water pump change!
Anyway, I'm just rambling now! I do hope you find the issue without much more headache!
Cheers
Keithy
Master
Well i had the waterpump changed when the heads got done last year. I did put a new thermo in the other day, so you'd expect it to work.
Are these thermos really that unreliable Steve?
And the water pump, how quickly would they fail under normal circumstances? Bear in mind, mine was off the road for about 4 months, could it have corroded.
I'm so not hoping it's a cracked block.
Master
What about the pressure cap?
RoverLord
Im not doubting your skills but its possible to fit a thermostat back to front,assuming its one you can simply replace,unless its like a D2 where its encased in the plastic hose union.
If its a free thermostat that you can simply replace(old school),drill a 6mm hole in its face plate,it eliminates air pockets that prevent it opening,especially if a leaky head gasket is introducing "air" into the coolant.
If it has the said D2 style thermostat,this advice is useless.
GOODLUCK
Andrew
DISCOVERY IS TO BE DISOWNED
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Master
Got that last week from British car components. The cap seems in good shape, a lot better than the old one and does what it should, that is release the pressure when high.
Come to think of it, i did notice the top of the radiator was not really hot, just warm.
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