Question about 1995 Toyota 4Runner

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I have a 1995 4runner automatic, 3vze(?)v6 engine. About two years ago I had to have the head gasket replaced($2700.00). It was done in the spring, so I didn't use the heater until the fall and found I had no heat. The garage I used gutted the thermostat. I put in a new one(195f I think), but started overheating. When I'm on a hiway it will get hot, and i've found that down shifting, or at hiway speeds, turning the overdrive off, will cool it down for a couple of minutes. City speeds, I have to go to 2 or 1, or if at a light, put it in neutral and get the rpm's up to about 3000 to cool it down again. I recently(3/11) had work done, and the mechanic told me the thermostat had to have a jiggle valve, which he installed and said I was good to go. About fifteen minutes later it started overheating again.

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The jiggle valve is just to assist in ensuring no air trapped behind the thermostat.It is important but only really at the bleeding air out stage.When it gets hot,throw the heater on,it should get hot and the temperature will come down or stabilise.I would recommend removing the radiator and having the top tank removed and the core tubes cleaned thoroughly. Refit it and ensure that you fill it slowly to allow air to escape.Use a good quality coolant too.Get back with your findings if fix still needed and I will endeavor to pinpoint repair needed.

Posted on Apr 01, 2011

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Posted on Jan 02, 2017

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