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Location:
cambo
Registered:
May 2002
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DESPERATE: thermostat for 4agze in ae86
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Sat, 02 August 2003 02:52
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im desperate guys! some time ago i asked about using a thermostat in my sprinter with gze when i dont have the original housing. someone said i cant remember who that you can mount the thermostat in the bottom hose, and sure enough cause i saw a corolla with a gze and the thermostat in the bottom hose.
so what ive done is get soem different bits of housing and mounted the thermostat in the bottom hose. the problem is, the engine overheats and the thermostat doesnt open! now, theres NO air in the system im sure, its a brand new thermostat and it works cause ive tested it (ive even bought a second one to be sure), and the housing does not touch then thermostat and block it from opening.
the thing is, the bottom hose is cold BOTH sides of the thermostat! how does that happen when there is DEFINATELY no air in the system? theres no blockage in the system as it flows fine without the thermostat the engine just wont warm up. ive got a brand new water pump and had the radiator cleaned and tested ok.
sorry for the long post but i really need help cause once this is sorted i can have my computer tuned and my car finished and finally go on a cruise with toymods 
thanks in advance.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Sat, 02 August 2003 14:37
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I just mounted the 4agze housing in my bottom hose right next to the pump, works just lovely! I've got a spare housing if you need one 
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Sun, 03 August 2003 10:50
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right next to the pump? doesnt your motor have a pipe running straight out the back of it running away from the supercharger? and with the original housing, doesnt that have other hoses coming from it like heater hoses or something? cause ive already sorted that part out, but my worry is why doesnt one side of the thermostat get hot when there is no air??? its crazy!
thank you for the offer of the housing but i dont think that will fix it as the housing im using should in theory work.
one thing i do as tho is, does the water circulate from the water pump, back round the s/c then to the bottom hose, up the radiator and into the cyl head or is it the other way round? confusion!!
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Location:
Sydney
Registered:
January 2003
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Re: DESPERATE: thermostat for 4agze in ae86
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Sun, 03 August 2003 13:02
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have you got it the right way round?
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Mon, 04 August 2003 09:00
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yeah i tried both ways just to be sure but either way its still cold down the bottom on both sides and i THINK i may know why now.
the thing i didnt mention is, i have a davies craig thermo fan on the front of the radiator. what i think happens is the water travels from the top hose down through the radiator and to the back of the water pump. the fan must be set to go off at a lower temp than the thermostat, therefor while im sitting there at idle and not driving the water in the head gets really hot, but the fan cools the radiator so the water is cool at the bottom hose. i think i have two options: set the fan to go on later, or put the thermostat in the top hose somehow, and i think that may be the better option althoughi will have to make some crazy long hose that goes out and comes back in so i can fit more things in it rather than have it go straight to the radiator. will look crap and bodgy (like the rest of my car) but should work best.
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Location:
Newcastle
Registered:
February 2003
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Re: DESPERATE: thermostat for 4agze in ae86
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Mon, 04 August 2003 11:15
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i have a 4age which feels likes its doing a similar thing
really hot at top of raidiator
cold at bottom
if its cold at the bottom how does the thermostat get activated to know it should let in more cold water
so my engine feels rather hot to touch
same as top of the raidiator but the bottom is cool as
and maybe related or something to do with the tvis but the longer i have been driving for the lower the revs at idle get until eventually it will stall itself out of gear
(but the temp gauge doesnt move from middle)
(just has the thermostat changed)
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Tue, 05 August 2003 11:12
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sounds identical to my problem. are you running an electric thermo fan? cause like i said for my situation it may be coming on erly, cooling the water in the radiator and therfor not allowing to open the thermostat. it will have nothing to do with TVIS.
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Location:
Newcastle
Registered:
February 2003
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Re: DESPERATE: thermostat for 4agze in ae86
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Wed, 06 August 2003 09:30
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no just a motor fan
but i do think its to do with the air throttle body letting in too much air or something
but im happy to be wrong and for someone to tell me how to fix it
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Location:
Newcastle
Registered:
February 2003
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Re: DESPERATE: thermostat for 4agze in ae86
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Wed, 06 August 2003 09:37
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but i changed my thermostat too and flushed the raidiator and now it rises exactly to the spot the sprinters are supposed to and stays there (talking about the internal gauge)
so i gather its not getting hot
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Thu, 07 August 2003 10:58
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and your thermostat is in the bottom hose? why is mine so gay then. i want it damn fixed already so i can get it tuned and stop getting 200k's per tank while driving it like a granny. and i wanna flog it 
i just tried to find a way to put it in the top hose today and there is NO way there is no room whatsoever espeically with a pipe containing the temp sensor for the ecu there. and you cant really move that can you.
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Location:
Newcastle
Registered:
February 2003
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Re: DESPERATE: thermostat for 4agze in ae86
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Thu, 07 August 2003 13:34
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its made to work in the bottom hose
what makes you think its not
its an 82 degree thermostat so the engine is always going to be hotter then that
anyways that doesnt solve my dropping idle problem that your having too
???
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Sun, 10 August 2003 07:56
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on most car the thermostat is in the head so top hose is the place that will simulate similar conditions.
my idle problem is due to a few things such as i have a fixed s/c pulley, my idle stop screw has been played with and my computer hasnt been tuned. which is all completely irelenvant to you unfortunately 
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Location:
MACKAY
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Sun, 10 August 2003 11:04
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EVOSTi
You will need to run a bypass hose for this system to work , a hose from the head outlet to the thermostat housing , The thermostat bulb must face the motor and the bypass hose must come from the water outlet in the head and flow to the thermostat housing on the motor side so as the water flow passes the thermostat bulb to open it when the water temp rises to the opening temp , This bypass circulates water through the motor while the thermostat is shut and when this water gets hot enough it will open the thermostat and water from the radiator will start to circulate through the motor , The thermostat will then regulate the amount of water flow to maintain a constant temp .
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Mon, 11 August 2003 07:29
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ok youve confused me a little are you saying i cant just run the thermostat in series in the top hose?
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Location:
MACKAY
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Mon, 11 August 2003 11:20
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The thermostat can be in the bottom or top but it needs a bypass hose which circulates the water through the motor and past the thermostat otherwise the thermostat will just act as a block and will not open , your motor will overheat , on other motors the thermostat is mounted on the head and the heated water in the head is in direct contact with the thermostat but they also have a bypass system to circulate the water while the thermostat is closed .
Trevor
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Location:
cambo
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Tue, 12 August 2003 07:30
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hmm this is spinning me out. so your saying if i run the thermostat in the top hose, it wont work? i figured the water from the head would heat up the eater in the top hose/thermostat and then open when necessary. i figured it doesnt need to circulate, juust heat up then circulate when the thermo opens and its to hot. hmmmmmm.
maybe i should just get the stock housing, get some new hoses, and hook it up as stock and dissconnect my current setup. damn.
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Location:
MACKAY
Registered:
May 2002
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Re: DESPERATE: thermostat for 4agze in ae86
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Tue, 12 August 2003 10:19
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If you mount the thermostat very close to the head in the top hose so the bulb side of the thermostat is only about 50mm from the head this may be close enough for the heat to travel in the water to open the thermostat before the head temp rises to high , If the thermostat is to far from the head the head temp will rise well above operating temp before enough heat is transfered from the head to the thermostat to open it , So when you start the motor the temp will rise to above operating temp until the thermostat opens then the temp should drop back and stabilize , To fix this problem a bit you can drill a hole about 3mm in the thermostat so there will be a small flow of water from the head and through the thermostat to help the heat flow to the thermostat which should make the temp spike less .
Anyway try the above and it may work OK !
Trevor
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Location:
cambo
Registered:
May 2002
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