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My son has a 1986 Toyota 4runner the heater will get warm but not hot it has a new thermostat.....

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Plugged heater core is possible.It's the lowest spot in the cooling system(almost). Flush out the core with a garden hose:carefully.
Don't snap the heater core tubes when removing the heater core hoses. May be easier to follow where the heater hoses go on the engine to flush it.

There will be a "bubble" in the system after you do this.

Drive the car really hard to purge the bubble and check coolant,again when cooled off. Also helps to park it uphill and rev the engine to force the bubble forward,into the radiator.

Posted on Nov 12, 2014


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Posted on Jan 02, 2017

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SOURCE: 1995 4runner running hot

the thermostat that you replaced it with may be too hot of a temperature thermostat ask the people at your local parts store what it calls for

Posted on Feb 23, 2009

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SOURCE: we have an audi a4 2.6cc , the heater only blows

sounds like the thermostat is not functioning correctly? either that or not in at all? thus making the water which would normally warm up quickly, warm up extremely slowly and on really cold days not at all? with a 2.6 engine your car shoudl warm up in record time?

Posted on Mar 04, 2009

michigan man
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SOURCE: Can I replace a 1990 Toyota 4runner engine with a

check with your local Toyota dealer in the parts department and make sure you give them the liter of both engines and they can give you the correct answer and you can also try to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

Posted on Mar 12, 2009

  • 15 Answers

SOURCE: 1986 toyota 4runner is leaking fluid and

just fixed one myself. replace rear output shaft seal on transfer case.

Posted on Jul 13, 2009

  • 507 Answers

SOURCE: heater wont blow hot thermostat 1998

is the heater tap working to let water through the heater core it may not be opening have to check operation of that

Posted on Oct 26, 2009

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