03-02-2017, 09:46 PM
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#31
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Mine was leaking from the heater control valve by the firewall. It was just dripping, but enough to lower the coolant over about a week or so. Changed it out and no loss of coolant or anything. I too replaced my thermostat, water pump, radiator, etc. and it ended up being this.
Quote:
Originally Posted by Atreyus
So I just replaced the thermostat, and heading to the mall today notice it was overheating again, this time it was just a little over the middle on the gauge, what could it be? Thermostat, Water pump, and radiator cap changed. I also noticed that when it was above the midpoint, I'd put the heater on and it would bring it back to the normal point where it usually is at.
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2017 TRD Off-Road Premium. Magnetic Grey. Dual Odyssey battery setup. Falken Wildpeak AT3W. Diode Dynamics SS3. Rigid Dually Spotties.
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03-02-2017, 11:01 PM
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#32
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Junior Member
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I appreciate all the help. I'll follow up once I've checked these.
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03-03-2017, 12:40 AM
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#33
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Quote:
Originally Posted by Ehahn84
Mine was leaking from the heater control valve by the firewall. It was just dripping, but enough to lower the coolant over about a week or so. Changed it out and no loss of coolant or anything. I too replaced my thermostat, water pump, radiator, etc. and it ended up being this.
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Did any of you guys that had the leak by the heater control valve notice coolant on the ground? I would think if it was leaking from there, you would be seeing it on the ground to some extent.
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03-03-2017, 01:06 AM
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#34
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Quote:
Originally Posted by Armygrunt11
I have a 1999 Toyota 4Runner. It's overheating when a thermostat installed.
Back story. The head gasket blew a few years ago. My brother got the head resurfaced and we installed a new head gasket. After putting everything back together it would overheat with the thermostat installed. Over heat just running idol. I've installed 7 different thermostats, a new water pump, new radiator, and even installed a electric fan to take some extra stress of the engine. There is no combustible fluid in the coolant. So I'm stuck. Any idea's what is causing this?
It currently has 201,000 miles on it. I'm about to cut my losses, but I've put so much money in it so far I just want to fix this. Any help is appreciated.
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Is this a 4 or 6 cyl? I have no experience doing head gaskets on these but from what I've read it's easy on the 6 cyl engines to get the gaskets on the wrong side or upside down so they block coolant passages. There should be a tab that sticks out from the sides that you can real L or R I think. Make sure they are oriented correctly. If it's a 4 cyl, I don't know. Maybe those are also capable of being put on wrong and block passages.
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1996 SR5 4Runner V6 4WD Auto
Toytec Ultimate w/ OME 890's plus 1.5" daystar spacer
60028 OME shocks, Goodyear Duratracs 265/75 -16
B&M 70268 with Magnefine filter, 199mm TBU
236K miles
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03-03-2017, 01:26 AM
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#35
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1996 SR5 4Runner V6 4WD Auto
Toytec Ultimate w/ OME 890's plus 1.5" daystar spacer
60028 OME shocks, Goodyear Duratracs 265/75 -16
B&M 70268 with Magnefine filter, 199mm TBU
236K miles
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03-19-2017, 12:48 PM
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#36
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Join Date: Nov 2015
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Sorry for the late response. No, I didn't get any coolant accumulation on the ground.
Quote:
Originally Posted by thegipper
Did any of you guys that had the leak by the heater control valve notice coolant on the ground? I would think if it was leaking from there, you would be seeing it on the ground to some extent.
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09-23-2018, 02:11 AM
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#37
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Join Date: Jun 2018
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3rd gen overheating
Hello
I have the same issue right now.
overheating.
thermostat, water pump, radiator cap changed. beacuse of overheating, I drained and filled several times, but still does the same.
it seems that thermostat does not open.
what could be the reason?
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09-23-2018, 08:59 AM
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#38
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Quote:
Originally Posted by gio-geno
Hello
I have the same issue right now.
overheating.
thermostat, water pump, radiator cap changed. beacuse of overheating, I drained and filled several times, but still does the same.
it seems that thermostat does not open.
what could be the reason?
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What do you mean by overheating?
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09-23-2018, 11:50 PM
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#39
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when I put on new thermostat and turn on the engine, water temp goes high, to the almost red. hose on the top of the radiator is too hot and the hose on the bottom is cold.
so I did not want to have more problems, tunr off engine and now I drive without thermostat.
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09-24-2018, 01:48 PM
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#40
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Quote:
Originally Posted by gio-geno
when I put on new thermostat and turn on the engine, water temp goes high, to the almost red. hose on the top of the radiator is too hot and the hose on the bottom is cold.
so I did not want to have more problems, tunr off engine and now I drive without thermostat.
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You can test the thermostat by removing it and doing a stove top test (place small pot of water on stove with thermostat in the water, when the water begins to boil, use tongs to remove it and check to see if it opened up). Also, while thermostat is out of vehicle, run the engine and see if you still have a hot/cold hose situation. That would be an easy way to narrow down where the problem is generally.
I've bought new thermostats before that failed, it's not that common, but still exists.
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09-28-2018, 01:14 PM
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#41
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I have tested thermostat, it works, new water pump, radiator checked and its good, radiator fan works, radiator cap changed. no oil in water and no water in engine oil. compression in all cylinder is the same and are good.
still when thermostat is installed water temp goes high.
can it be water temp. sensor?
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09-28-2018, 02:29 PM
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#42
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Quote:
Originally Posted by gio-geno
I have tested thermostat, it works, new water pump, radiator checked and its good, radiator fan works, radiator cap changed. no oil in water and no water in engine oil. compression in all cylinder is the same and are good.
still when thermostat is installed water temp goes high.
can it be water temp. sensor?
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Any chance the thermostat is installed backwards? (not sure if it can be with the housing, but worth asking)
-Charlie
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09-28-2018, 03:06 PM
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#43
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Junior Member
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no, there is no chance. because of size.
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09-30-2018, 01:59 PM
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#44
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Quote:
Originally Posted by Varangian
You can test the thermostat by removing it and doing a stove top test (place small pot of water on stove with thermostat in the water, when the water begins to boil, use tongs to remove it and check to see if it opened up). Also, while thermostat is out of vehicle, run the engine and see if you still have a hot/cold hose situation. That would be an easy way to narrow down where the problem is generally.
I've bought new thermostats before that failed, it's not that common, but still exists.
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I have tested thermostat anf it works, but when it is installed on the engine, it does not open. any idea about that?
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09-30-2018, 03:31 PM
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#45
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Do you have a temp gun to compare or a scanner that reads live data to compare the ECU temp to the instrument cluster temp?
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