4A-GE MK1 Engine Help I seem to be missing something in the trunk

Sam1 · 06-03-2007, 11:27 PM

my fans are on all the time and I changed the temp sensor in the rad and that isn't the problem so I was wondering if I'm missing something that's causing it because I have a connector on the drivers side of the trunk with nothing

Hellstorm · 06-04-2007, 04:19 PM

umm...... what year mr2 do you have man?

Sam1 · 06-04-2007, 06:19 PM

Quote:

Originally Posted by Hellstorm

umm...... what year mr2 do you have man?

1985

Sam1 · 08-25-2007, 09:11 PM

anyone? my radiator fan stays on all the time and I think I might be missing some a/c components. anyone know where the "a/c amplifier" is located? relays seem to be good. replaced the water temp sensor in the radiator and no luck with that either

Mista 2 · 08-27-2007, 02:03 AM

mine are one all the time because i took my thermo fan plug out of the sensor. they wouldn't turn on because the switch was stuffed and i couldn't get a new one at the time

driftmonster · 08-27-2007, 03:37 AM

^ me too.

CpuZapper · 10-05-2007, 03:12 PM

That plug is for the ECT computer for auto transmission'd cars. It's more than likely that your radiator sensor is toast. They're not too expensive, but you have to drain a lot of coolant, and then refill and properly burp your cooling system to replace it.

Sam1 · 10-10-2007, 09:37 PM

Thank you, I've always wanted to know because all the mr2's I've seen have nothing for that plug.
As far as the radiator sensor I replaced it with a new one and still the same problem. I even went and got two from the junk yard and tried those and they're still on full blast!

Mista 2 · 10-11-2007, 09:44 AM

have you done a full rad flush? you could just have sh*t biult up around the plug so it isnt getting a reading.

4v6 · 10-11-2007, 10:43 AM

Heres a fan relay diagram that may help.

I know this is for a gt4 but its wired pretty much the same as an mr2 minus the a/c switch which needs to be jumpered if the a/c is removed.

Ok, notice that if you loose the rad fan switch, the fans will run full time because it allows the relay to switch the fan motor on. Its normally held off its contacts by being constantly ON.
So youve replaced the switch they still run full time.
This system relies on the first relay on the diagram with the 12volt perm feed being activated when you turn on the ignition. If it dosent switch on the fans will run full time no matter what you do with the rad fan sensor switch.
So, you need to check the fuses first, and then substitute the relay for a known good one. Note; you MUST use the correct relay for these fans as theyre wired differently to other relays that LOOK similar. Theres a diagram on the exterior of them that will help you dentify them.

Hope this helps.

Sam1 · 10-11-2007, 09:35 PM

I'll check it out. This might be some very useful information thank you for posting and i'll keep you guys updated

06-03-2007, 11:27 PM	#1 (permalink)
Sam1 Some Skills Join Date: Feb 2007 Posts: 76 Thanks: 6 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Help I seem to be missing something in the trunk my fans are on all the time and I changed the temp sensor in the rad and that isn't the problem so I was wondering if I'm missing something that's causing it because I have a connector on the drivers side of the trunk with nothing

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06-04-2007, 04:19 PM	#2 (permalink)
Hellstorm I Bet I Can Break It. Join Date: Sep 2006 Location: The Woodlands, Texas Posts: 734 Thanks: 12 Thanked 9 Times in 3 Posts iTrader Rating: (7/100% )	umm...... what year mr2 do you have man?

08-25-2007, 09:11 PM	#4 (permalink)
Sam1 Some Skills Join Date: Feb 2007 Posts: 76 Thanks: 6 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	anyone? my radiator fan stays on all the time and I think I might be missing some a/c components. anyone know where the "a/c amplifier" is located? relays seem to be good. replaced the water temp sensor in the radiator and no luck with that either

08-27-2007, 02:03 AM	#5 (permalink)
Mista 2 Cage Fighter Join Date: Nov 2006 Location: Adelaide, Australia Posts: 463 Thanks: 16 Thanked 21 Times in 21 Posts My Google Map iTrader Rating: (0/0% )	mine are one all the time because i took my thermo fan plug out of the sensor. they wouldn't turn on because the switch was stuffed and i couldn't get a new one at the time

08-27-2007, 03:37 AM	#6 (permalink)
driftmonster I'm back I'm back Join Date: May 2007 Location: Bangkok,Thailand Posts: 831 Thanks: 57 Thanked 26 Times in 24 Posts iTrader Rating: (0/0% )	^ me too.

10-05-2007, 03:12 PM	#7 (permalink)
CpuZapper RallyRacer Join Date: Mar 2005 Location: Portland, OR Posts: 482 Thanks: 7 Thanked 25 Times in 22 Posts My Google Map iTrader Rating: (1/100% )	That plug is for the ECT computer for auto transmission'd cars. It's more than likely that your radiator sensor is toast. They're not too expensive, but you have to drain a lot of coolant, and then refill and properly burp your cooling system to replace it.

10-10-2007, 09:37 PM	#8 (permalink)
Sam1 Some Skills Join Date: Feb 2007 Posts: 76 Thanks: 6 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Thank you, I've always wanted to know because all the mr2's I've seen have nothing for that plug. As far as the radiator sensor I replaced it with a new one and still the same problem. I even went and got two from the junk yard and tried those and they're still on full blast!

10-11-2007, 09:44 AM	#9 (permalink)
Mista 2 Cage Fighter Join Date: Nov 2006 Location: Adelaide, Australia Posts: 463 Thanks: 16 Thanked 21 Times in 21 Posts My Google Map iTrader Rating: (0/0% )	have you done a full rad flush? you could just have sh*t biult up around the plug so it isnt getting a reading.

10-11-2007, 10:43 AM	#10 (permalink)
4v6 http://www.Typ-85.co.uk Join Date: Jun 2007 Posts: 184 Thanks: 2 Thanked 24 Times in 14 Posts iTrader Rating: (0/0% )	Heres a fan relay diagram that may help. I know this is for a gt4 but its wired pretty much the same as an mr2 minus the a/c switch which needs to be jumpered if the a/c is removed. Ok, notice that if you loose the rad fan switch, the fans will run full time because it allows the relay to switch the fan motor on. Its normally held off its contacts by being constantly ON. So youve replaced the switch they still run full time. This system relies on the first relay on the diagram with the 12volt perm feed being activated when you turn on the ignition. If it dosent switch on the fans will run full time no matter what you do with the rad fan sensor switch. So, you need to check the fuses first, and then substitute the relay for a known good one. Note; you MUST use the correct relay for these fans as theyre wired differently to other relays that LOOK similar. Theres a diagram on the exterior of them that will help you dentify them. Hope this helps.

10-11-2007, 09:35 PM	#11 (permalink)
Sam1 Some Skills Join Date: Feb 2007 Posts: 76 Thanks: 6 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	I'll check it out. This might be some very useful information thank you for posting and i'll keep you guys updated