1991 4-RUNNER; OVERHEATING?

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Old 07 Jul 2010, 07:47 am   #1 (permalink)
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Default 1991 4-RUNNER; OVERHEATING?

I HAVE A 91' 4-RUNNER THAT WAS LEAKING WATER OUT OF THE RADIATOR. I REPLACED THE RADIATOR AND NOW WHEN THE RUNNER IS GOING AROUND 65 TO 70 MPH IT STARTS TO OVER-HEAT, ALMOST RED-LINE ON TEMP. GAUGE.THERE IS NO WATER IN THE OIL. HEAD GASKET'S HAVE BEEN RECENTLY REPLACED.
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Old 07 Jul 2010, 07:48 am   #2 (permalink)
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The speed probably doesn't have much to do with it, it would more be related to how long it's been running. You probably need a new thermostat.
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Old 07 Jul 2010, 07:54 am   #3 (permalink)
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type into searchbox































how to check overheating car































wil get you info on what to look for































most of time id say its a flow problem somewhere coolant not flowing thru motor or radiator as fast as it needs too could be radiator fans hoses water pump timing head gasket
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Old 07 Jul 2010, 07:55 am   #4 (permalink)
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Your problem is a bit odd as what you are describing (at high speed) is typical of a clogged radiator (was it a new one? or used?) Any kind of overheat, the thermostat should be replaced as they do wear out and a t-stat is fairly cheap comparatively. Advanced timing can cause an overheat and like you said if the headgaskets were replaced recently- a double check of cam timing and distributor timing may be warranted here. I have seen where the head gaskets were swapped left for right (they are different), but the overheat for that problem will be immediate and at idle. Some checking is needed--Good luck---T&T
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Old 07 Jul 2010, 08:03 am   #5 (permalink)
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I have seen this before, good chance you have a leaking head gasket.















They are common to go, there was a bad gasket from a supplier.















If you have never had them replaced you may be able to get it done under warranty, there was a recall on them. Call your local Toyota dealer and give them your VIN and they can tell you.
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