Replacing nested coolant hose

chickeneater · 05-31-2013, 06:13 AM

On my 1988 7M-GE, there are two hoses that feed into the thermostat housing, which then feeds into the upper radiator hose. Both are 90 degree formed hoses. The are aligned side-by-side: one is on the right and the other is to the left of it (assuming right and left refer to the car sides, ie, right = passenger side, left = driver side). The left hose runs underneath the timing belt housing. Unfortunately it is leaky! I have no idea how I'm supposed to replace that. It doesn't even look like a worm gear clamp will fit in there.

Any advice is greatly appreciated!!

Busted Knuckles · 06-02-2013, 08:36 PM

Thanks to cre, I've got the coolant and heater hose exploded diagrams with part numbers (below). I'm getting ready to replace all the rubber lines, since I've now had 3 coolant lines pop leaks in the last year. It looks like the best way to replace both these 90-deg bends is to remove the thermostat housing. The fit is very tight, but removing the housing first looks like it will open up the space. Cut the existing hoses if you need to, then remove the cut hoses once the housing is off. Attach new hoses to the housing, then install the hoses to the pipes on the block as you reinstall the housing with a new gasket.

http://www.cygnusx1.net/Supra/Librar...spx?F=1603&P=1
http://www.cygnusx1.net/Supra/Librar...spx?F=8716&P=1

chickeneater · 06-03-2013, 04:40 AM

thanks for the info!!

i was really hoping there was a way without having to remove anything...

Bill UK · 06-03-2013, 09:46 PM

Is this one of the hoses your referring to ?

chickeneater · 06-05-2013, 12:21 AM

yup, thats the bastard!

MA70-3.0GT · 06-07-2013, 02:51 PM

I don't know for sure, but from that picture it looks to me like you could release the clips, cut that hose & twist it off with needlenose pliers without removing anything & then a new one would be reasonably easy to fit, being new & flexible. Just make sure the hose clips are put on the centre of it first & perhaps clean the stubs up with emery paper &/or smear a little silicone sealer inside the hose ends first to make it slide on better.

chickeneater · 06-08-2013, 02:58 AM

thanks for the advice, but im guessing i couldnt reach in there not only because the fan is in the way, but i can barely reach a finger in there so i dont see how i could fit pliers or anything else in there!

05-31-2013, 06:13 AM	#1
chickeneater Stock Join Date: May 2013 Location: Portland Posts: 16	Replacing nested coolant hose On my 1988 7M-GE, there are two hoses that feed into the thermostat housing, which then feeds into the upper radiator hose. Both are 90 degree formed hoses. The are aligned side-by-side: one is on the right and the other is to the left of it (assuming right and left refer to the car sides, ie, right = passenger side, left = driver side). The left hose runs underneath the timing belt housing. Unfortunately it is leaky! I have no idea how I'm supposed to replace that. It doesn't even look like a worm gear clamp will fit in there. Any advice is greatly appreciated!!

06-07-2013, 02:51 PM	#6
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	I don't know for sure, but from that picture it looks to me like you could release the clips, cut that hose & twist it off with needlenose pliers without removing anything & then a new one would be reasonably easy to fit, being new & flexible. Just make sure the hose clips are put on the centre of it first & perhaps clean the stubs up with emery paper &/or smear a little silicone sealer inside the hose ends first to make it slide on better. __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

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06-02-2013, 08:36 PM	#2
Busted Knuckles 12psi boost Join Date: Dec 2007 Location: Atlanta Posts: 300	Thanks to cre, I've got the coolant and heater hose exploded diagrams with part numbers (below). I'm getting ready to replace all the rubber lines, since I've now had 3 coolant lines pop leaks in the last year. It looks like the best way to replace both these 90-deg bends is to remove the thermostat housing. The fit is very tight, but removing the housing first looks like it will open up the space. Cut the existing hoses if you need to, then remove the cut hoses once the housing is off. Attach new hoses to the housing, then install the hoses to the pipes on the block as you reinstall the housing with a new gasket. http://www.cygnusx1.net/Supra/Librar...spx?F=1603&P=1 http://www.cygnusx1.net/Supra/Librar...spx?F=8716&P=1

06-03-2013, 04:40 AM	#3
chickeneater Stock Join Date: May 2013 Location: Portland Posts: 16	thanks for the info!! i was really hoping there was a way without having to remove anything...

06-03-2013, 09:46 PM	#4
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Is this one of the hoses your referring to ?

06-05-2013, 12:21 AM	#5
chickeneater Stock Join Date: May 2013 Location: Portland Posts: 16	yup, thats the bastard!

06-08-2013, 02:58 AM	#7
chickeneater Stock Join Date: May 2013 Location: Portland Posts: 16	thanks for the advice, but im guessing i couldnt reach in there not only because the fan is in the way, but i can barely reach a finger in there so i dont see how i could fit pliers or anything else in there!