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JoshMaffers posted a topic in Engine & TransmissionHello guys, hopefully I have posted this in the right location. I have a Lexus is220d, when driving after about 30 minuets or so, or after high engine revs the temperature gage rises and shows that the car hot. After about 30 seconds it then drops down to the normal temperature again. However after 1-2 hours of driving the temperature then rises and very rarely drops, when it does drop it is only very slightly. When I checked, the engine water had sprayed all over the top of the engine from the water reservoir and there was no water left in the reservoir. Also checking the water that had sprayed on the engine, it is not oily. I am having to top the water up every day, sometimes twice a day. When the temperature is normal the heating in the car works, but when the temperature rises the heating goes cold, even on max temperature. The engine runs perfectly and when opening the oil cap it is not grimy and it is clean. Finally when opening the reservoir cap to fill it, the pressure is being releases causing the reservoir to fill with the water again and spray out of the overflow pipe. I have seen some people mention that it could be the head gasket, however a mechanic mentioned it sounds more like the thermostat, any ideas? I have ordered a thermostat and I will replace that, however I can't find anywhere the actual location of the thermost. All of the guides are for the 250, which is different and it is not in the usual simple location, at the top of the engine. If anyone could point me in the right direction of that, it would be extremely helpful as well!
Hey all, this will be myvery first post here, so appoligies for any faults. so i set out to change the thermostat on my gs300, the old one was stuck open. (image of the manual on how to do this) steps (in short), drain coolant remove lower radiator hose remove thermostat housing swap old thermostat for new one reinstall just because i was bored i decided to test if the new thermostat opens before i set of putting it in. get a pan fill it with water and make it boil, luckily i have an IR thermometer and it read about 82 degrees (celcius) when the thermostat opened up. (in the image it's still closed fyi) so after the engine had cooled i just pulled out the lower radiator hose, nothing special here just make sure to have a big bucket in one hand while doing this, also this is not necessary but i replaced the factory clamps on the hose with these ones, after that you find the thermostat housing with its 2 10mm bolts holding it in place, undo both of them (carefull not to loose them, they are pretty small and will fall immediately) and after removing it, its all really dirty as well so i cleaned it off with some brake cleaner. this is what i looks like when cleaned together with the new thermostat. for reference here is the page on thermostat removal form the workshop manual (sorry i dont know how to rotate it) as you can see the thermostat already comes with a rubber gasket so dont worry about that. torque specs are 8.8nm which would mean just handtighten it the thermostat has a little jiggle valve on it make sure this is on the highest part (so pointing upwards) this is so that air can go out, also the thermostat housing has this little spot indicating where the jiggle valve should be. note the spring side of the thermostat has to be on the engine side (very logical but it doesnt hurt to mention) and thats it you have removed and now swapped the thermostat, all left to do is put it all back together. put the thermostat in the housing and slide the housing in its spot, tighten the bolts and that re mount the radiator hose, get your rag and clena off all the spilled coolant. fill your system back up with coolant (fill the radiator, not the reservoir) squeeze the hoses to purge air and start the engine after you are done, dont forget to top up the reservoir after you filled the radiator and keep an eye on the system for the next few days. top tip; if you installed those clamps i mentionned, you'll have to get back in there and retighten them as the rubber will compacten under the tension of the clamp and this is what it looks like all finished hope this may hlp someone some day, please leave a comment on wheter you liked my first post and ill keep posting things i do on my car, next job is probably going to be a valve cover gasket.