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colin4255
Sr. Member
Posts: 119
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« Reply #1 on: January 10, 2011, 11:20:16 am » |
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Assuming you have no water in the oil or oil in the water system (easy to check as you would see a kind of pale cream sludge on the dipstick of the oil, and some gunge in the expansion tank (water), then its highly likely you have an air lock in your water system. These things do need bleeding when you remove a lot of water to do things like fix a radiator, or work on the engine. It is just possible you have an air lock. OR, it could easily be that one of the water pipes possibly to the heater has collapsed, partially blocking the water system. No heat from the heater means no water is circulating to it. Pressure build-up like you describe is bad, potentially dangerous and also a sign that something is blocked or being partially blocked.
Personally, I would drain the system, flush the water system and radiator, and irrespective of whther the mechanic thinks they are working, fit a new thermostat immediately, then re-fill and completely and properly bleed all the air from the system and see what happens.
If you keep driving it like this will definitely kill the engine!
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jack daniels
Sr. Member
Posts: 132
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« Reply #4 on: January 11, 2011, 04:54:47 pm » |
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I bought a trico thermostat a while ago that didn't work as it should. After e-mailing Trico they confirmed that it was wrongly listed in the catalog and wasn't for my vehicle at all. Sounds like you could have air in the system, I've found that the best way to get the air out of my petrol motor is just to drive it. We have some steep ascents and descents where I live, that combined with some sideways g force gets the air to the top pretty quick.
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Espace, Grand (magnifique, formidable, grandiose, considérable, noble, ample) III 2002 JE02 F4R DP0 2.0L 16v auto
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ESPACED
Jr. Member
Posts: 41
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« Reply #7 on: January 11, 2011, 10:28:29 pm » |
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Hi all.. Sorted had the mechanic fit the Renault parts to day.. (Thermostat and the temp switch) all working well.. Heaters working as they should and engine temp 3 bars going on 4 then back to 3 when the fan kicks in.. Happy .... not half... Thank you everyone for your input.. And may that be a lesson.. Always use decent parts....and try using Renault parts if you can.. I won’t be using Euro-parts again best reagrds Tony
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ESPACED
Jr. Member
Posts: 41
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« Reply #9 on: January 23, 2011, 03:40:34 pm » |
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Hi guys Back to the drawing board.. Car been fine for 2 weeks now and everything has been working as it should even sitting in traffic ... but yesterday coming down the M1 doing about 70 car over heated again...the RAC worked on it for an hour testing and getting rid of any air locks and I drove home.. All OK.. The RAC said it may be a blockage of dirt in the system and I should take the thermostat out put a good quality water flush and run the car for 2 weeks and then put it all back.. (I don’t think it is but I need to do it to eliminate the possibility) This morning even before I turned the engine over i took the cap of the expansion tank and the pressure threw the water out ? So I started her up opened the air valves up and put water and went out, all seems OK.. I will flush the car but I can see this being the main problem Does anyone have any ideas why this is happening..
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colin4255
Sr. Member
Posts: 119
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« Reply #12 on: January 23, 2011, 10:25:05 pm » |
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It means that your water system is pressurising itself and then staying like that. There can be quite a few reasons for this. When a thermostat sticks, assuming it sticks closed, its actually keeping water in the engine where it gets very hot and pressurises instead of circulating around the car. Tne actual idea of a themostat is to do exactly that until the water reaches a termperature at which wax inside the thermostat melts, allowing it to open and circulate the water. The idea to speed up warming up of the engine. If its not a stuck thermostat, it could be an air lock in the system. It could be a blocked radiator. It could be a partially collapsed water hose, but while that may explain the intermittent nature of the fault, I doubt a collapsed hose would cause the car to retain presure to tha textent overnight, unless you also have the wrong expansion tank cap on the car. I would look for a blockage, or if a lot of work has been done, maybe a metal hose section has been bent or crushed? There are a few of those on the car. Are you sure the new heater matrix is OK? Did anyone test running water through it before fitting?
Also, do you have the right cap on the expansion tank? They all have different pressure ratings. Check with a Renault dealer to make sure the cap is the right one for you car. I'd replace it anyway seeing as you are having so much trouble. It could be you have aleaking head gasket even... Its hard to say without stripping stuff down, but I would exhaust all the other possibilities first.. Good luck with it
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