22R overheats at first, then cools off - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 06-20-2010, 09:48 PM
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22R overheats at first, then cools off

So I have an '87 4x4 pickup with a 22R. I just emptied the cooling system and flushed out the heater core because I wasn't getting any heat. Turned out to be a rusted up control valve which I cleaned and got working again.

I have heat now, but after refilling the system I developed a weird engine overheat problem. When I start the truck cold, the temperature gauge steadily climbs up to near the red. I've never let it reach red but when I pull over and kill the engine for a minute or so, the gauge drops back down to just below halfway and doesn't move until it cools and I restart it. The first time it happened I was idling in my driveway and noticed the radiator was cold until i turned the engine off, then after sitting I heard some gurgling and the top hose and radiator heated up and the temp gauge dropped. It seemed like there was no coolant flow into the radiator until I turned the engine off for a minute. This happens very consistently.

Does anyone know what would cause this? The radiator is brand new, but there is definitely rust in the cooling system (when I drained it the coolant was rusty and there was rust in the heater core and valve). Is it possible that rust is plugging the thermostat or something? Bad water pump?

Thanks in advance
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#2 Old 06-21-2010, 08:14 AM
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Could be an air pocket in the cooling system. Did you burp it after you refilled it?

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#3 Old 06-21-2010, 04:59 PM
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Sounds like air in the cooling system to me.

Try getting the front end as high as you can (park on a steep hill or jack up the front end). Open the rad, set your heater to hot and turn on the motor. Let it run till its warm. All of the air should get purged out, then re-fill any fluid loss with your 50/50 mix of red coolant and good water.

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#4 Old 06-22-2010, 10:43 AM
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Hey thanks for the advice,

I did that and a bunch of air came out, actually I've done it three times, there was a lot of air. The car stopped overheating but now it's operating temperature is a little lower than it was before? The thermometer used to stick dead center once it got warm but now it hangs a little low. Is this any reason for concern?

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#5 Old 06-22-2010, 03:47 PM
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Sounds like flushing the system is working better after you flushed it.
That's good.

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#6 Old 06-24-2010, 05:36 PM
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Seems I was wrong, the problem is back but it only happens from a dead cold start. I've tried to burp the car several times and air does seem to come out, but the coolant has a habit of exploding out the radiator too as soon as the thermostat opens up (or should open up at least). Again when I start it cold it gets very hot, then after a minute of engine off when I start it back up again it seems to circulate fine. I just don't understand why it would be doing this since I thought I purged all the air.

Thanks
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#7 Old 06-24-2010, 06:47 PM
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what kinda thermostat do you have?

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#8 Old 06-24-2010, 09:10 PM
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Again when I start it cold it gets very hot, then after a minute of engine off
But what happens if you don't turn the engine off?
Does it continue to get hot and actually overheat, or does it spike and then return to normal?

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#9 Old 06-25-2010, 11:22 PM
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not sure what kind of t-stat it is but following a mechanic's advice i took it out and cut off the jiggle valve, now the engine doesn't overheat, but the truck runs a little bit cooler than it should. take the bad with the good i guess
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#10 Old 06-27-2010, 10:06 PM
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I flush my radiator,cooling system about every 2 years, when I do it I remove the tstat and flush the heater core. When I fill the system back full of coolant I leave the tstat out until I see water just in the manifold then I put in the tstat and a new o-ring. I have never had problems with air in the cooling system since I have been doing it this way. I had the same problem you have mentioned here.
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#11 Old 06-29-2010, 08:26 PM
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Get a new t-stat. Test it in a pot of water on the stove before installing. Install in the correct direction (point toward radiator).
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#12 Old 06-30-2010, 02:45 PM
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could be other problems too since air seems to continue to get in. either a pinhole leak sucking air in when it cools, or engine trouble like a cracked head/block, blown HG, etc.

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