VX Overheating Issue
hey guys....my car is having an intermittent overheating issue....it happened a few months back where it overheated just out of the blue..then i let it sit for an hour...and the issue seemed to have gone.....just for peice of mind, i flushed the radiator and whatnot...thought that fixed it as it has been a few months since it happened....last night and today it started again...but this time i noticed that the car starts idling rough when it is starting to overheat....so im thinking it might be the waterpump seizing up....any ideas guys??
Bingo....its either water pump with a empellar issue....or a seizing up....
or a themostate...
since you said the overheat even now happens at night ...look at both..carefully by replacing both
also look and check for welsh plugs that may be leaking under high pressure or hot water...
and that means check the rad..and overflow tank ..the inside heater core and all pipework ...
dont drive the thing till your sort it out., its not worth wrecking a engine to keep going .....
if the car engin is 10 years or 200k plus kms old.....rip that pump out ...
and make sure when you bleed the system...
1/2 coolant and 1/2 water back.....
empellars rust away due to not enough coolant changes and the right amount of inhibation....
also dont well under stress of having worn stretched belts......
at night or in the rain....you car engine should shed off temp..and get cooler...and that 1st mark is how cool they can get...
and stay given the right conditions...
but normally just under the icon markings...
and under load section 2 if that...
hope this helps...
well i checked the waterpump...absolutely no chance that its seizing up....so now ive taken the thermostat out....how do i actually test that the thermostat is working?
Put it it boiling water see if it opens up??Originally Posted by King_berald
thermostat
carefully place the thermostat in a pot of boiling water and watch the valve. It should open about 2cm Take it out and place in cold water. It should shut fairly quickly
ok i boiled the kettle.....put the thermostat in the water....and it didnt open.....soo its a dud? how accurate is this method?
this method is extremly good and if it didn't open that is your problem mate, when your coolent gets hot it opens the termostat to let coolent go round to the radiator to be cooled ... hence cooling the engine ... but if that dosn't happen cause it dosn't open it just cooks the coolent
new thermostat mate =)
It's spot-on. New themostat required.
beautiful....thanks for your help guys...
too easy mate, happy days haha =)
ok slight issue....i tested the new thermostat in the boiling water aswell and it also didnt open....so i got confused... ended up boiling a pot of water and sitting them in while it was boiling....they both open...umm...any other ideas?
i should probably emphasis that when the needle starts going up....the car idles a little rough....whatever the problem is, is affecting the running....
and the only other things i can possibly put it down to are the water pump or the temp sensor.....would a faulty temp sender cause a rough idol?
sounds like it is genuinly overheating, that's why it's idling rough.
my suggestion is to take your car to a radiator place and let them check the state of your radiator. the last time i had the same problem it turned out my radiator was 35% clogged and there was a crack/leak near the top end. and that was after it has supposely been flushed and pressure tested by my mechanic recently. and he couldn't find anything wrong with my car, just thinking that i was imagining things. not going back there ever......
car started overheating agin today on the way to work.....got the system pressure tested and there was no leaks......the mechanic said that he is 99% sure that its because there was some air in the system, but im not sure if this is the cure as i never had any overheating issues with my old vp wagon and i had to keep topping that up all the time.....any thoughts??
Is the thermo fans coming on at all?
yeh they do come on......im pulling my hair out over this man. the problems intermittent...could happen tomorrow...could happen in a week...i got NFI
Donating Member
I'm with the mechanic, who by the way should have just bled it, it would have only taken a minute or two.
I thought I was wrong once but I was mistaken.
Is the overflow bottle full or empty after it overheats? It may need a new pressure cap or the radiator may have some blockages in it. Another thing to check is the fins on the water pump, they can depending on the type corrode (some are pressed metal others cast then machined. This would be especially if the coolant is not the right type or concentration is incorrect or it has not been replaced often enough.
just a another idea in the morning when its cold and u start up does it run rough then seem to settle after its warm .?
i had this problem and found it was spitting water out the exhaust manifold .i couldnt see that it was doing that cause i was in the car 5am in the morning turns out i had cracked heads but was stuck as to why i was using water and couldnt see any trace of leaks .
also tried all of the mentioned above even got the fans wired up so they would stay on constantly but the heads where cracke so it didnt do shit to stop the over heating cheers man i hope you find it soon cause i know how stressful it can be trying to find it forgot to mention i took this car to the Radiator repairers just after i bought it and they CO2 tested it instantly found the problem .i had the car back and forth to the dealer id previously bought it off for about 3 weeks .there excuse was that the car had gotten worse over time hence not being able to pick the problem up when they initialy did there own CO2 test .
The rough idel is from the oil thinning out and you are loosing oil pressure. The hydraulis lifters are empty and not opening the valves properly. Careful. There is a million ecotec heads at wreckers that have cracked from overheating.
10psi boost. extractors, twin cats 3" mandrel bent exhaust big slotted brakes kenwood head deck with 600 watt sub.
ok guys...well i took the car to a mechanic and he said he was 99% sure that it was because the system wasnt bled properly....he pressure tested it and it held pressure...he then bled the system properly and that was it....a few days later i checked the coolant in the radiator and it had gone down....im not convinced that it was only because the system wasnt bled properly.
help? headgasket?? radiator??
Yeh sounds same problem i am having
I have pressure tested my car found 2 tiny water leaks....
Changed the hose's,thermosat,radiator cap.....
But still when i drive for 1 week than check my water its gone down..
I think its drawing water into the overflow but not returing it back into radiator???????????????????
Any help welcome??????????
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