bens747 Posted April 6, 2009 Share Posted April 6, 2009 (edited) Driving back home today and noticed the temp gauge right up in the heavens and then it dropped down. Then up and down. It seemed to do this on the change of the throttle. Got back home and there was plenty of water but the expansion tank was bubbling like a kettle. Could it be a sticky thermostat??. Any help would be appreciated. Edited April 6, 2009 by bens747 (see edit history) Quote Link to comment Share on other sites More sharing options...
Duffman Posted April 6, 2009 Share Posted April 6, 2009 Air pocket would cause this. May need to bleed the system Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 6, 2009 Share Posted April 6, 2009 Its also a symptom of the water pump failing, so it will pay to check it. Quote Link to comment Share on other sites More sharing options...
bens747 Posted April 7, 2009 Author Share Posted April 7, 2009 Surely a failing water pump would be sign that it was leaking. What else can fail on a water pump. Thanks Quote Link to comment Share on other sites More sharing options...
3LL Posted April 7, 2009 Share Posted April 7, 2009 have you checked the oil lately? sounds silly but could it be overheating for a simple reason. I only ask as im having similar troubles since yesterday that im trying to diagnose. lol Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 7, 2009 Share Posted April 7, 2009 (edited) Surely a failing water pump would be sign that it was leaking. What else can fail on a water pump. Thanks The impeller blades can erode causing erratic flow, or depending on construction the impeller can become loose and ether not turn or also turn erratically, it doesn't necessarily have to leak. You mentioned the temp seemed to change with the RPM;) Edited April 7, 2009 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
bens747 Posted April 7, 2009 Author Share Posted April 7, 2009 Not checked the oil yet as will be starting to look tomorrow got some ideas to get started on though. Rad Cap .. Thermostat ... Air Lock .. Water Pump any other ideas would help but am concerned about the water pump mainly ... Quote Link to comment Share on other sites More sharing options...
bens747 Posted April 7, 2009 Author Share Posted April 7, 2009 The impeller blades can erode causing erratic flow, or depending on construction the impeller can become loose and ether not turn or also turn erratically, it doesn't necessarily have to leak. You mentioned the temp seemed to change with the RPM;) Yeps tricky it did appear to do that and now you mention it would sound like a water pump would cause that if not what else could it be ... am worried now lol Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 7, 2009 Share Posted April 7, 2009 Eliminate the simple stuff first:) Quote Link to comment Share on other sites More sharing options...
Alex Posted April 7, 2009 Share Posted April 7, 2009 I went through this years ago, being sensible, I cleaned the coolant system out, flushed it to death, changed the water pump (cr@p job) and it still wouldn't work. Turned out, it was the rad, internally it had failed. If I ran the engine, warmed it up and then stopped it you could reach through from the fan and feel cold spots all over it (well more like most of it). Changed the rad and bingo all was ok again. The waterpump wheels are pretty tough. I'd suspect the rad first and the thermostat 2nd. Change the rad cap and rad for NEW toyota OEM parts. Quote Link to comment Share on other sites More sharing options...
bens747 Posted April 7, 2009 Author Share Posted April 7, 2009 Thanks mate will start to check it tomorrow. Foned Camberly Autofactors today just to get an idea on price of a water pump ... approx about 70-80 quid so not bad if it's that. but will go for the simple stuff first ... Thanks for your help will keep u posted ... Quote Link to comment Share on other sites More sharing options...
Alex Posted April 7, 2009 Share Posted April 7, 2009 Thanks mate will start to check it tomorrow. Foned Camberly Autofactors today just to get an idea on price of a water pump ... approx about 70-80 quid so not bad if it's that. but will go for the simple stuff first ... Thanks for your help will keep u posted ... Water pump is a lot of labour on top - the front (of the engine) needs to come off...DIY job IMO unless you like giving money away. But like I say I don't think it's the issue. Quote Link to comment Share on other sites More sharing options...
j1mb0b1 Posted April 7, 2009 Share Posted April 7, 2009 Headgasket my megane had the same thing just before it went !! OR if its not the headgasket then dont run the car till its sorted as if i had an airlock as you did then thats what made my headgasket go in first place... Quote Link to comment Share on other sites More sharing options...
bens747 Posted April 7, 2009 Author Share Posted April 7, 2009 Water pump is a lot of labour on top - the front (of the engine) needs to come off...DIY job IMO unless you like giving money away. But like I say I don't think it's the issue. Already did the core plugs behind the water pump and had the front of the engine off and did myself so no problem there. Will check the oil to see if it might be a head gasket. Hoping for just and airlock as my heater hasn't really worked properly since I did the last job on the core plugs .... Quote Link to comment Share on other sites More sharing options...
bens747 Posted April 8, 2009 Author Share Posted April 8, 2009 Seems there was an airlock in the heater matrix which had cleared on a long run reducing the amount of water in the system. Which then started to overheat and overflow the expansion tank. Must have put 2.5 ltrs back in to the system. Thanks to Ian C for the advice on how to clear air locks in the cooling system and now everything seems to be working ok. Will keep an eye on it just to to be sure everything is deffo ok and working properly Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 8, 2009 Share Posted April 8, 2009 Glad you got it sorted, and it was a simple fix. I'm surprised that so many people have problems with air locks, never had a problem myself, other than a leak where i blocked off the TT water feeds, but even then no air locks. Quote Link to comment Share on other sites More sharing options...
hadyn Posted April 8, 2009 Share Posted April 8, 2009 Check all your coolant hoses as well as precaution after all that Quote Link to comment Share on other sites More sharing options...
Jamesy W Posted April 8, 2009 Share Posted April 8, 2009 Glad you are all sorted, I'd personally still go ahead and change the thermostat and rad cap though. Quote Link to comment Share on other sites More sharing options...
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