my car is overheating...?

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Old 28 Jun 2010, 04:45 pm   #1 (permalink)
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Default my car is overheating...?

My 1995 Toyota 4runner lately has been running hot and it seems when i have my heater on it overheats and when its off, it does fine. The coolant level always seems to drop, but there arent any leaks and its not blowing out of my exhaust. I heard it could be a bad thermostat and so i went to replace it, but there was no thermostat there in the first place...i used a pan to drain the coolant out when i loosened up the "thermostats compartment" and replaced the thermostat. Re-added coolant till the radiator was full and tried running my truck. It started kind of rough and turned off... i checked the coolant level and it didnt go down any. what could be my problem?
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Old 28 Jun 2010, 04:48 pm   #2 (permalink)
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maybe a clog in your cooling system. bring it for a flush
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Old 28 Jun 2010, 04:51 pm   #3 (permalink)
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well the fact that u changed the coolant doesnt stop it from starting. so i would say 1st thing to do is connect your vehicle to a scan tool and check for trouble codes. if your not comfortable doing that any autozone will check it for you. also make sure you didnt accidently unplug or damage anything while changing the thermostst out. look for broke wires or pinched wires. just go back over your steps while changing the thermostat out and go from there hope it helps















if i can help just send me a message
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Old 28 Jun 2010, 04:54 pm   #4 (permalink)
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its a 4runner and most of those were a 3liter(very few were 22R, and you didnt specify, so will assume a 6 cylinder) They did have waterpump leaks that would leak inside the timing cover and were hard to detect. But, my gut feeling and knowing V-6 runners is that it has a head gasket leak. The rough running after startup was a clue as was the unfound coolant loss. The engine will consume it in small quantities. Coolant in either #6 or #1 will cause the rough start til it burns off. Some more testing is needed to confirm my suspicion (block test with dye is one way) as it is potentially an expensive repair and you don't want to guess at it. A special test tool is installed at the radiator and filled with blue dye. If there is combustion gas present (as from a gasket leak) inside the radiator, the dye will turn yellow. If yor truck has super high miles (250k plus) it may be time to trade. ( the gasket may just be the start of major problems; oil usage-noise/rattles from worn pistons-etc) Get it checked and then decide the next action. Good Luck--T&T
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Old 28 Jun 2010, 04:58 pm   #5 (permalink)
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you probably have a blown head gasket,very common on these early engines
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