I was driving today and noticed that the temp gauge was sitting one bar higher than normal (not a particularly warm day). It stayed the same for about 20km but then as I literally got home the temp gauge just hit max. In the Engine Coolant Holder the coolant was bubbling and some had leaked out. It was all very hot. There does not seem to be any piping leaks. I'm a bit perplexed what could be causing the overheating and causing the Engine Coolant Holder at the front of the radiator to bubble. Any ideas?
I filled up the Engine Coolant Tank with coolant and let the engine run and could hear the coolant being sucked into the radiator. The tank was dry so I filled up again and repeated. Then I noticed that the coolant was bubbling as though hot and flowing out of the overflow pipe. Help appreciated of what might be the issue.
Sunday, November 04, 2018 - 07:53 pm, by: Blake Gloyn(Blakenz)
If your radiator is in good nick, then it is likely your thermostat has failed, and is shut! replace the thermostat. You can do it yourself if you are flexible and patient.(two nuts to undo) a cheap fix, provided the engine isn't damaged, though sounds like you might have caught it just in time.
Monday, November 05, 2018 - 10:31 am, by: Mark Tierney(Mark_t)
Only toyota red coolant, ever. Yep, Blake's on the money. Most likely the thermostat. A professional flush and completely change the coolant. you wont believe the gunk that comes out on a pro flush anyways. A professional can also tell you of the condition, and whether the radiator needs a service or change. Did the current coolant have any colour/murkiness in it or residue around the radiator cap when you removed it (and does it currently have toyota red in it?)
Monday, November 05, 2018 - 07:37 pm, by: Blake Gloyn(Blakenz)
When my thermostat failed, on my first Soarer, the heat it caused, loosened a whole lot of crud from the cooling system(most likely the water galleries of the motor) which then got caught in the radiator, so end tanks were taken off, and core was cleaned.
Thursday, November 08, 2018 - 12:46 pm, by: Tom Claffey(Tom_claffey)
Mine ran hot the other day but it was 37degrees and towing a heavy trailer up hills (we may have the only Soarer with a towbar?) Backing off throttle and turning off AC up hills kept temp in normal central range - when I get car home it will get a radiator flush! One tip; if you keep filling with coolant and it still overheats one cause can be an airlock - there is a square plug on front of engine at highest point, remove and prime with coolant to fix airlock.