heating please help - Toyota Nation Forum : Toyota Car and Truck Forums

Henry0313 · 09-01-2009, 10:23 PM

ok i have a 91 mr2 n/a.. few days ago it started heating up on me it spilled almost all the antifreeze out. i brought it back to l.a filled it up with oil than antifreeze and it was working perfectly for 2 days again.
than it started heating up on me again spilling all the water from the resevoir hose.. than it went back to normal temp than few mins wanned to heat up again, can it be the temp sensor or the thermostat malfuctioning

please help asap

Henry0313 · 09-01-2009, 10:25 PM

o yea and when its on idle it dont heat up and it starts heating up after awhile when im driving it

Henry0313 · 09-01-2009, 10:34 PM

how long are the fans suppose to stay on? when to they turn on when its cold or when its warm already

***MR2Jedi*** · 09-01-2009, 11:12 PM

The fans turn on when they sense engine is getting above nominal temperature.. Usualy after the engine is warmed up and the car is idleing.
After the engine is warmed up, let it idle and see if you hear the fans kick on.

Before you over heated, when was the last time you serviced the cooling system?

Henry0313 · 09-01-2009, 11:15 PM

it warm up and and it was on idle but fans never kick in...
never have done the coolant service

Henry0313 · 09-01-2009, 11:18 PM

where is the temp sensor located at?
the lower bolt from the thermostat is strip cant get it out is there a way to get the f*** off

***MR2Jedi*** · 09-01-2009, 11:45 PM

Heres a diagram of it's location, but it's not what causing you to overheat.
At some point at idle, the fans should kick on.Does the temp go down when the car is moving?
Does it just overheat when idleing for awhile?

Henry0313 · 09-02-2009, 12:14 AM

yea the thermostat for the 91 mr2 n/a is located on the right side of the oil filter and headers..
when its on idle it dosent overheat but it does get warm really fast. and when i start driving for like 1/2 mile or less it starts overheating so i have to put it back on neautral for it wont overheat while its moving

Henry0313 · 09-02-2009, 12:15 AM

at first it would heat up than it would go down for like 3 mins or less than it goes back up but it hasent done that for awhile

***MR2Jedi*** · 09-02-2009, 12:54 AM

Get a bolt extractor and check your thermostat. Sears sells a good bolt extractor kit for around $12.00

GeoffBooth · 09-02-2009, 03:36 AM

try a new thermostat but it's probably the head gasket on it's way out and probably at the #4 cylinder. Do a compression test.

Henry0313 · 09-03-2009, 09:19 PM

yea we did a head test already and its ok...
im changing themostat switch and sensor thermostat
fan switch too... hopefully it works