Question about 1990 Toyota Pickup

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Coolant leaking from the back of engine. not overheating or check engine light. running good but losing coolant.

I changed out the thermostat and bought a new radiator cap.

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Could be a couple places and a pressure tester would help find that. Otherwise Start looking from the top of the engine and work your way down. If i had to take a guess i would have to say intake gasket is leaking.

Posted on Nov 25, 2014

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There are a lot of places the 3vze could be loosing coolant/antifreeze on the back of the engine. Need to get a radiator pressure tester and find out exactly where you are losing coolant/antifreeze to fix the problem.

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

SQUIRESXX
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SOURCE: 92 toyota truck. just bought. has newly rebuilt

FILL RAD AND BOTTLE, LEAVE CAP OF AND WATCH WHEN ENGINE IT RUNNING , IF LEVEL DROPS WHEN MOTOR REVS PUMP OK, IF NO CLEAR MOVEMENT PUMP FAULTY, IF BLOWS WATER OUT, POSSIBLE HEAD GASKET OR CRACKED BLOCK/HEAD, YOU CAN DO THIS WHEN COLD,
ALSO CHECK THERMOSTAT IS NOT UPSIDE DOWN AND ALL HOSES CONNECTED ON REBUILD ON CORRECTLY

Posted on Dec 26, 2009

miket756
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SOURCE: My 1998 corolla has been overheating recently. I

yes you could change them both yourself if you have the tools,,,and it could be a blowen head gasket or a leaking water hose,,or water pump,,,
first get a new cap,,the cap holds the presher in the rad so the water dont boile up so easly the thermostst may be ok,,,

Posted on Jul 01, 2010

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SOURCE: 93 toyota pick up overheating

I suspect a viscous fan hub fault. It slips excessively and will not draw air through the radiator in sufficient quantities to cool the engine..( That is if you have a viscous hub). Toyota hubs are well known as having insufficient fluid in them to do the job properly. ON mine it was possible to spin the fan backwards while the engine was running. Otherwise check the fan sensors and relays.

Posted on May 19, 2013

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A hot running engine is usually caused by a cooling system problem. Make sure the coolant level is full and the thermostat.. rad fan.. radiator cap and water pump are all functioning correctly. Make sure there are no restrictions in front of the radiator to obstruct air flow and coolant circulates properly throughout the radiator. As for losing oil, check for the obvious..... Leaks. If no major leaks and you have a high mileage engine, suspect the oil to be burning within the engine. A constantly hot running engine can also cause the oil to break down quicker resulting in consumption, especially if oil changes are neglected

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Just had the head gasket replaced am losing water and there are bubbles in radiator took it back told me bubbles were normal in older cars wondering if water can leak out the thermostat


Well, I've never heard that bubbles were normal in older cars. I'd say the shop was at fault for shoddy repairs. You got it back and it's leaking or losing coolant? Something they should have checked very carefully for before calling the work finished.
Possibly, the bubbles were from overheated coolant because the level was low, after you noticed the loss of water. You asked if coolant can leak from the thermostat-there is a gasket on the thermostat housing that covers the thermostat, and that housing gasket can certainly leak. And sometimes does after thermostat replacement, since the bolts are not torqued down real tight to avoid distorting the gasket and causing a leak. If you see any sign of coolant around the thermostat housing, it may be leaking there. You would need to turn the housing bolts down about a half turn, and see if that stopped the leak. If it still leaks, you would probably need a new thermostat housing gasket. Don't know if you want to confront that shop again, but they should do the service for free, it was their job to finish the job. A small task and a two dollar gasket is about it, but someone will have to drain a good portion of the coolant first. They should have checked for leaks or losing coolant.

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I have a ford focus wagon that is having overheating problems. I topped off the coolant but it still redlines and the check engine light comes on. The car is a manual and when the light comes on and the...


There could be several causes for your trouble.The most common are either a leak in the coolant system or a stuck thermostat. If you haven't noticed any puddles under the car it more likely the thermostat. They should be replaced every 2-3 years along with the coolant.

However, before you run out and replace that check to make sure the cooling fans are working. Let the engine run and as the temperature guage gets close to overheating, the fans should kick in. If they don't I would fix that problem first. To check the fans themselves run a power wire from the positive side of the battery directly to the fan motor. If it runs, it's good and the problem will likely be the temp sensor for it. Replace it.

You should also blow the rad fins out with compressed air if you have it or even a garden hose. Sometimes they will fill with crud and road grime enough to interfere with cooloing. Blow out from the engine.

If the fans work and the rad is clean you will have to replace the thermostat. If you want to test it when you have it out, drop it in a pot of boiling water and see if it opens when you do. It should, most thermostats are set to open before boiling so it should open very quickly. Never put a used thermostat back in an engine. Also put new coolant back in when you change the thermostat. Hope this helps.

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Thanks for choosing FixYa and welcome to the site. They all are right. Anyone of those parts can cause overheating. The most common issue is the thermostat though, followed by the water pump. You could have a defective coolant sensor. If you have a bad head gasket, it will cause overheating. If you change the water pump, change the valve and the impeller also. Do this. Check your coolant level first and make sure it is level. You said fans are good. Make sure the radiator is good and is getting fluid inside it. Make sure there are no leaks. Check all coolant hoses. Like I said, the most common issue is a sticking thermostat or a bad one. Next, I would say the water pump.

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The other day my check engine light came on after my engine started overheating. I did a diagnostic reading on it and the code came up P1258. What does that entail?


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CHANGE THERMOSTAT AND RADIATOR PRESSURE CAP.CHECK COOLANT LEVEL.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER.MAKE SURE COOLING FANS COMING ON WHEN ENGINE REACHES 190 DEGREES.TO SEE IF COOLANT FANS RUNNING TURN ON CAR AIR CONDITIONER TO SEE IF FANS RUN IF NOT CHECK COOLING FANS FUSES.IF FUSES GOOD I AM LOOKING AT A FAULTY COOLANT TEMPERATURE SENSOR.IF ALL IS GOOD.NO LEAKS AT RADIATOR HOSES + HEATERS HOSES. NO LEAKS AT WATER PUMP WEEP HOLE OR GASKET.NO LEAKS AT RADIATOR.LAST RESORT CHECK ENGINE OIL. IF LOOKS LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.THAT WILL CAUSE ENGINE OVERHEATING.

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