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Post by lmpluv7 on Jan 29, 2009 12:54:20 GMT -5
Ok, I have an 88 4Runner V6 with auto. I am having trouble with my heater. Im not getting any heat at idle. It will melt your eye balls when Im going down the road but as soon as I stop at a light or something it starts blowing cold air. Ive changed the thermastat but did it quickly so I may have put the jiggle vavle in wrong. Ive flushed both heater cores and drained and vaccuum filled it twice now and still the same thing. I used to have a red 88 4Runner V6 that did the same thing but it was totaled before I could look into it. Is this a common problem? If so does anyone know what the cause could be?
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Post by whomadewho on Jan 29, 2009 14:10:15 GMT -5
Did you check the radiator cap? You maybe loosing pressure. You may want to when the engine is cold,place a thermometer in the radiator to check the water temp when the engine is idling. which would indicate if the thermostat is working properly.
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Post by Justin on Jan 29, 2009 19:08:53 GMT -5
My 4runner did the same thing when my head gasket went.
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Post by DeadlyPeace on Jan 29, 2009 21:26:44 GMT -5
From what you've really done I'm guessing it's a head gasket. But just FYI on your thermostat the pointed end should normally face the water outlet and flat end towards the intake manifold. To check one you can immerse it in water and heat it up gradually and check the temperature it opens at is within the specs on the thermostat. Also make sure that the spring is tight when fully closed.
When refilling the cooling system did you make sure to burp it?
For the head gasket, here are a few things to check.
- Remove the radiator cap and start the engine. Check for bubbles. If she in there then pull her, she plugging up your system......J/K my bad. If you got an excessive amount of bubbles then you might be getting air pushed through the gasket from the one or more of the cylinders.
- Check the oil cap and dip stick for milky residue on them. If so them you might have water leaking through the gasket and into the oil.
- Do a compression test to all of the cylinder to check that they not more then 10 PSI's difference from the max spec allowance and lowest reading. Depending on the result could be different things
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Post by kellenc on Feb 3, 2009 11:37:13 GMT -5
There are 2 possibilities that I can think of.
#1. head gasket like everyone has mentioned before
#2. Your coolant system may need to be burped. If you have and air pocket in the system, the water pump may not be able to push the coolant all the way through the system at idle. The reason I think this is because the heater core loop is almost the the tallest (out side the block) point in the 3.0 coolant system that is where I think an air bubble would naturally go to.
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Post by scavengerdog on Feb 21, 2009 19:29:38 GMT -5
this happens on many different models besides just toyotas. it usually turns out to be an air bubble in the cooling system or a bad cap. pressure test to rule out a head gasket, though.
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