I need your help

JibrilsAuto · 11-04-2009, 10:57 PM

Today while driving i could smell coolant, looked at my temp needle and it was fine just below half way. As i got to school and parked my car the needle shot all the way up, so I left it alone came back 3 hrs later and everything was fine. on the way back home it shot back up but if i drove fast it would shoot back down. I pulled over to see if i saw any leaks but nothing. I did not drive on for any more then a min pulled over got it towed. what can it be? by the way this is a 93 mr2 non turbo 5 speed

mr.ac · 11-04-2009, 11:04 PM

it could be a couple of things, low to no coolent level, bad theromosat, bad water pump,bad radator cap, leaky coolnet hoese, or worse a blown head gasket?...

how was it driving before it started overheating?

LeePeyton · 11-04-2009, 11:07 PM

Severe loss of power = Head Gasket
Rapid spike in heat or random changing = Thermostat
If it does the above and leaks water = Water pump

Some times it's a little of both that leads to a blown head gasket.
Ask my 240sx of back in the day.

JibrilsAuto · 11-04-2009, 11:24 PM

it was driving fine before the overheating stated, also forgot to mention it was making a wired noise coming from the engine bay hard to describe. Im hoping its just the thermostat it did Rapid spike in heat or random changing

LeePeyton · 11-05-2009, 12:34 AM

I would just change the thermastat. sounds like it's still wanting to work but gets stuck closed or is stuck closed.

o6spdracer · 11-05-2009, 03:39 AM

Was there any smoke?

I would change out yoru thermostat and even the temp sending unit. Both parts are fairly inexpensive and can be ordered through Aaron Willis at Lithia Toyota (awillis@lithia.com)

CJMR2T · 11-05-2009, 05:47 AM

Quote:

Originally Posted by JibrilsAuto

...... on the way back home it shot back up but if i drove fast it would shoot back down......

Im suprised no one caught on to this or mentioned this little statement,

So your basically saying that if you drive slow, the temp climbs but if you get up to higher speed, it'll drop back down????

If so, then the first place I would look is the radiator fans. The MR2 already has a design flaw with the way the radiator is ducted, fans not coming on only make this situation worse..

The thermostat would not be effected by speed.

9 times out of 10, if a engine heats up at low vehical speeds and cools back down at higher vehical speeds, its an airflow issue through the radiator.

11-04-2009, 10:57 PM	#1 (permalink)
JibrilsAuto No Skills Join Date: May 2009 Posts: 12 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	I need your help Today while driving i could smell coolant, looked at my temp needle and it was fine just below half way. As i got to school and parked my car the needle shot all the way up, so I left it alone came back 3 hrs later and everything was fine. on the way back home it shot back up but if i drove fast it would shoot back down. I pulled over to see if i saw any leaks but nothing. I did not drive on for any more then a min pulled over got it towed. what can it be? by the way this is a 93 mr2 non turbo 5 speed

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11-04-2009, 11:04 PM	#2 (permalink)
mr.ac Just Say NO to Snorkes Join Date: Nov 2008 Location: Central Coast, CA Posts: 388 Thanks: 0 Thanked 19 Times in 18 Posts iTrader Rating: (1/100% )	it could be a couple of things, low to no coolent level, bad theromosat, bad water pump,bad radator cap, leaky coolnet hoese, or worse a blown head gasket?... how was it driving before it started overheating?

11-04-2009, 11:07 PM	#3 (permalink)
LeePeyton Building Motor from Hell Join Date: Jun 2009 Location: Tennessee/USA Posts: 1,696 Thanks: 23 Thanked 67 Times in 61 Posts iTrader Rating: (2/100% )	Severe loss of power = Head Gasket Rapid spike in heat or random changing = Thermostat If it does the above and leaks water = Water pump Some times it's a little of both that leads to a blown head gasket. Ask my 240sx of back in the day.

11-04-2009, 11:24 PM	#4 (permalink)
JibrilsAuto No Skills Join Date: May 2009 Posts: 12 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	it was driving fine before the overheating stated, also forgot to mention it was making a wired noise coming from the engine bay hard to describe. Im hoping its just the thermostat it did Rapid spike in heat or random changing

11-05-2009, 12:34 AM	#5 (permalink)
LeePeyton Building Motor from Hell Join Date: Jun 2009 Location: Tennessee/USA Posts: 1,696 Thanks: 23 Thanked 67 Times in 61 Posts iTrader Rating: (2/100% )	I would just change the thermastat. sounds like it's still wanting to work but gets stuck closed or is stuck closed.

11-05-2009, 03:39 AM	#6 (permalink)
o6spdracer Nothing Clever Join Date: Jan 2007 Posts: 2,187 Thanks: 1 Thanked 112 Times in 107 Posts iTrader Rating: (1/100% )	Was there any smoke? I would change out yoru thermostat and even the temp sending unit. Both parts are fairly inexpensive and can be ordered through Aaron Willis at Lithia Toyota (awillis@lithia.com)