91 Turbo Cooling Issues

mirage83 · 07-29-2011, 06:02 PM

Do you have the fan shroud (if so, is it in good shape?) or the splash guard under the engine? Both make a difference to your temperatures when the car isn't moving.

El Supracabras · 07-29-2011, 08:12 PM

After you have checked what is mentioned above, check all your hoses. A small hole in a hose may not leak coolant but instead suck in air while coolant is circulating. This will cause an air pocket and it will puke coolant out soon after. Its usually a sign of air in the system if the temp goes down when driving and up when stopped. Make sure you have the heater on when filling the system to purge the air out of the heater core.

a400tool · 07-29-2011, 09:56 PM

Quote:

Originally Posted by El Supracabras

After you have checked what is mentioned above, check all your hoses. A small hole in a hose may not leak coolant but instead suck in air while coolant is circulating. This will cause an air pocket and it will puke coolant out soon after. Its usually a sign of air in the system if the temp goes down when driving and up when stopped. Make sure you have the heater on when filling the system to purge the air out of the heater core.

I've done all that as well. I will recheck the turbo coolant hoses to be sure.

Thanks.

a400tool · 07-29-2011, 09:55 PM

Yes, fan shroud is in good shape as is the engine under cover.

mirage83 · 07-29-2011, 11:23 PM

Quote:

Originally Posted by a400tool

Yes, fan shroud is in good shape as is the engine under cover.

Damn, was really kinda hoping you'd respond that your shroud was mangled or missing.

How confident are you in your fan clutch? The fluid in them can leak out over time which prevents it from spinning up properly when you're idling.

Also, have you pressurized your coolant system to see if one of your hoses has a weak but not obviously blown area?

Forgive the questions, just trying to hit all the reasonable bases before you go digging into your radiator and water pump.

Green7mgte · 07-30-2011, 03:08 PM

dude a fan shroud, while important isn't as extremely critical as all that.

El Supracabras · 07-30-2011, 05:48 PM

Maybe this will help...or scare you. It scares me..... to think of how many points of failure the cooling system on the 7MGTE has. Hope ya get it sorted out soon.

El Supracabras · 07-30-2011, 05:52 PM

Don't forget this.

mirage83 · 07-31-2011, 12:03 AM

Quote:

Originally Posted by Green7mgte

dude a fan shroud, while important isn't as extremely critical as all that.

I know, but from my perspective every little bit is a gain, and as prone to overheating as these cars are I don't write any contributing factors off.

Green7mgte · 07-31-2011, 12:11 PM

mmm I love coolant diagrams. I've replaced both hoses going to my heater valve assembly.. that 90 degree one is a pain.

07-30-2011, 03:08 PM	#6
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	dude a fan shroud, while important isn't as extremely critical as all that. __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

07-30-2011, 05:48 PM	#7
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	Maybe this will help...or scare you. It scares me..... to think of how many points of failure the cooling system on the 7MGTE has. Hope ya get it sorted out soon. Attached Thumbnails

07-30-2011, 05:52 PM	#8
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	Don't forget this. Attached Thumbnails

07-31-2011, 12:11 PM	#10
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	mmm I love coolant diagrams. I've replaced both hoses going to my heater valve assembly.. that 90 degree one is a pain. __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

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07-29-2011, 06:02 PM	#1
mirage83 12psi boost Join Date: Feb 2007 Location: Georgia Posts: 359	Do you have the fan shroud (if so, is it in good shape?) or the splash guard under the engine? Both make a difference to your temperatures when the car isn't moving.

07-29-2011, 08:12 PM	#2
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	After you have checked what is mentioned above, check all your hoses. A small hole in a hose may not leak coolant but instead suck in air while coolant is circulating. This will cause an air pocket and it will puke coolant out soon after. Its usually a sign of air in the system if the temp goes down when driving and up when stopped. Make sure you have the heater on when filling the system to purge the air out of the heater core.

07-29-2011, 09:55 PM	#4
a400tool 3" Exhaust Join Date: Sep 2008 Location: Arizona Posts: 56	Yes, fan shroud is in good shape as is the engine under cover.