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Re: checked old thermostat and it seems to be working
Hello, I am guessing at which motor you have but its probably the quad four. If you are leaking water on the back of the motor look a the engine cover remove the four bolts and disconnect the electrical connector and look about midways of the back of the head if there is any white caked on looking stuff around the bolts then you have a cracked head.There is no quick fix. Replacing the head is about all you can do. Thank You
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Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?
just because the gauge seems normal doesnt mean the thermostat is good, its 5 years old,and may be opening to soon, i would start by having the t-stat replaced and while thats being done have the cooling system flushed including a flush off the heatercore. i ve worked on a couple of these vans with heating problems, most were low on coolant due to a slow waterpup leak, the others with half plugged heatercores, due to the lack of coolant flushes. hope this helps.
When you replaced the thermostat, did you bleed the air out of the coolant lines? When I replaced my thermostat on my old car forgot to bleed the lines out so it kept overheating until I did, then it worked fine. The air in the lines messes up the thermostat somehow and can cause it not to work like it should.
check the basic, from fuse and relay engine cooling . have the fan check making sure the fans motor is good, does the fans come on at all when the engine has been running for while, if not it can be the switch, i would go ahead and replace them both thermostats and thermostats switch if you haven't done it. Thermostat switch has to be good, which it turn on and off the cooling fan. Thermostat (work like a valve) has to also operate properly other wise the fluid will continue to flow hot or not flow at all. thermostats will cost 7-8 bucks and the switch cost 47-50 bucks.
Did u test the THERMAL LIMITER on the blower resistor? this is the part that burns out, the resistors always look fine. Replace the resistor, it is cheap and i am sure it will fix the problem. U may also wish to check the 30 Amp blower motor relay circuit breaker in the underhood fuse box, I believe it is marked HEATER.
Usually,when low temperature code is set,the thermostat is malfunctioning,although it could be a bad temperature sensor too.If the vehicle has alot of miles,and the thermostat is old,go ahead and replace it as it isn't very expensive,and a new one is good insurance against engine overheating as that can severely damage an engine.If the problem still persists,test or replace the temperature sensor,and check the wires and connector for a tight connection.Also check the entire cooling system for leaks or loose connections,weak hoses,and flush and fill with new coolant if old,as antifreeze deteriorates with age too.Good luck.