mattgottheFD

iTrader: (6)

I know there are already threads on this but i cant find them. I just put the new koyo in and a new thermostat. Ive bled the coolant and waited for all the air bubbles to come out and it still reads hot as hell and now the coolant is spraying out of the top radiator hose that connect to the filler even though it is clamped down. can anyone help, i want to drive my car so bad.

MIBagentQ

iTrader: (3)

something clogged?

gafu mazda

ive been fighting with heating issues as well and some suggestions is the water pump?Also,test(or shouldve)the thermostat to see if it opens at temperature,but honestly if you replaced radiator,and tstat,the pump is the next thing IMO.Good luck.

mattgottheFD

iTrader: (6)

not sure. i was reading another thread about removing the thermostat and flushing water through there to see if there is a clog. is that a smart idea for this situation?

mattgottheFD

iTrader: (6)

yeah im gonna try a new water pump. also, how do you test the thermostat. dont you have to boil it?

mattgottheFD

iTrader: (6)

does anyone have a hose diagram for the whole cooling system including all the small hoses connecting to the ast and overflow. i have the repair manual but none of the diagrams seem to have these connections. reason i ask is my friend started working on my car without me and he is the one who disconnected all the hoses and im not sure if i put them back on right.

gafu mazda

this is basically rx7 heaven,where you can find tons of information by searching(I dont mean that in a bad way).Do a search on the diagram,or simply go read the FSM also on this site that would give you a few ideas/how to as well.And yes,youd have to remove the tstat and boil it to see if its working properly.Good luck.



Gil

Toyotarx7

iTrader: (13)

i had a HUGE over heating problem last winter, the car spilled coolant out the top like yours did and even reach temps up to 135 degrees., i'll tell you what i did, it may help you, if you have the stock AST tank, replace it for the better one made of metal, replace ALL THE TUBING connected to it too!! that was my problem( remember our cars do have age on them, so swapping out the tubes and lining can only help you ), i also bought a koyo radiator and when i bought it i also purchased new radiator tubes, ( i bought blue ones but colors does matter ) ALSO mixing your own mixture of water and water-wetter helped me maintain my temps at 82 degrees at all times! even while driving long distances my highest temp is 84 degress, ALSO, idk if this is true or not but i still did it, i jacked the front end of the car and i added the coolant slowly with a big funnel and make sure u " burp" the car, ( pump the main coolant hose with ur hand, the top line ) i poured coolant in it and actually ran the engine for about 3 mins to make sure all the air pockets are out. if your still over heating the only thing i can tell you is that ur low on water/coolant, even tho it may seem like ur full, ur really not, there must be a leak some where, def not ur water pump unless u see it leaking from the seals. i dont think its ur water pump because its not exposed to any possible damage, its only moving water. let me know how things go, good luck with everything, let me know if u need help

adam c

iTrader: (2)

In order to diagnose your problem, you need to give more information. When does it overheat? Sitting in the driveway idling? Cruising down the road?? WHEN??

It sounds like you are not driving the car, so I am going to guess that it overheats when sitting at idle. If that is correct, it is most likely that your fans are not coming on. If the fans don't come on, your car will overheat regardless of what radiator or AST you have.

If you t-stat is not oem, replace it with an oem unit.

mattgottheFD

iTrader: (6)

ok. to start out. my fd is my daily driver. it started overheating one night driving and so i stopped, waited for it to cool down and added some coolant and it was fine until the next morning it did the same thing. now that thats outta the way. i finally got it to stop overheating. i found the correct way to connect the ast in my repair manual and its runnin cool except now i have a leak in my top main hose. im gonna replace it tomorrow and hopefully that'll do it. as for upgrading the ast, what are you guys runnin? any suggestions.

mattgottheFD

iTrader: (6)

oh yeah. and fans do come on. it would take a complte jackass to not know if their fans are comin on

Sgtblue

iTrader: (16)

Ya think? Surprisingly, statistics show that about the same number of people hook up their AST wrong, or fail to post sufficient information when asking for help from more experienced owners. And most surveys suggest that about the same number of people also let friends disassemble their car without watching too. But back on topic....

*What temps are you seeing anyway?
*Don't just make sure your fans are coming on, you should confirm that they operate properly at all speeds. See FSM.
*Pettit and several vendors offer aftermarket ASTs, but personally I like the looks of Fighter's Garage AST (scroll down) http://fighters-garage.com/rx7.html . It's a little bit more expensive, but probably worth it.
*Replace the upper radiator hose and AST. Refill with no more than about 40/60 ratio of coolant to distilled water. Burp the system thoroughly. If it still runs hot, I'd pressure test the system.
*In my experience, when a waterpump goes bad it still moves coolant, but leaks or makes noise. If you don't see either one of those symptoms, I wouldn't replace it.
http://www.autosportracetech.com/RX-7/coolingsystem.htm

Toyotarx7

iTrader: (13)

just curious, i found a way to have my fans run when the key is turned to the 2nd switch on my ignition, " ON " position, and they come off when the key is off and out of the ignition, do you think thats a bad move on my part and i should return it back to the original position or should i leave it? its been working great for me since, plus i feel its a great way to withdraw all that heat under the hood after the car has been running, kicks the heat out from underneath and helps it cool off when the engine is off, any suggestion? sorry " mattgottheFD" i know this is your thread i just wanted to ask this question....



but back to your topic, the same thing happened to me when i was driving my car one night and mines my daily too! def look into a new radiator hose, if possible swap out the top and the bottom hose just to be safe ya kno, also you can do what my dumbass did and jack up the car when its cold , hood open, run the car til its getting warm and sit there and watch it!!!! watch it like a hawk and look for leaks ( take off the bottom panel so u can look up into the engine, but make sure u put it back, it plays a big part in ur cooling system ) hahahaha just a thought : )

I kno everyone is getting technical with this situation but i strongly feel that all u need is new hoses a purged cooling system with the right amount of water. its really simple but very easy to make a mistake on, trust me i kno!!!! ive been through hell and back with my car's cooling system. ALSO BEFORE I FORGET!!!! change ur coolant cap!!! if its still the stock one that may be a problem, like i said b4 our cars do have some age on them!!! change the cap 1st and see what happens, its like 8 bucks at pepboys!! good luck

mattgottheFD

iTrader: (6)

thanks Tmoney. i forgot to mention to i changed the radiator cap the same time as the thermostat and radiator, but im gonna get some new hoses today for sure. and sgtblue i did not ask my friend to start taking apart my car, and i wasn't even around him when he did it. i usually do all my **** myself and the whole hooking up the ast wrong was before i had the repair manual

RotaryRX-007

How many miles on that motor, man?

Got any carbon (black ****) floating around in your coolant?

mattgottheFD

iTrader: (6)

actually i think there was a little bit of black in my coolant last time i drained it. motor is at 61,xxx miles now though

Toyotarx7

iTrader: (13)

mine has 75k on it, i dont think u'll have black **** in ur coolant at 61k, im not sure though i havent had that experiance and i hope not to have it. have you had any luck?

mattgottheFD

iTrader: (6)

ok. i just check the coolant that i drainedrom the last time and it looks pretty clean. but i do remember seeing a little bit of black stuff in my original coolant i drained towards the bottom of the bucket. i was gonna do the hoses today but im not sure if i should until i explain to you guys exactly what is goin on now. during the burping process i do have a little bit of the champane bubbles people describe and instead the coolant leveling off and no bubbles it starts to boil and overflow the funnel or just squirt out and when i shut the car off all the coolant drops down the filler and i get that boiling sound inside.the weird thing is my temp. is reading normal and i do not have any aftermarket gauges. but as for yesterday which i described before it was reading below half but the coolant was squirting out the top hose even past the clamp. do you guys think the seals are toast or should i just check my thermostat again ?

RotorRyan

iTrader: (3)

hmm kinda sounds like coolant seals, then again it could be a nasty air bubble. I say coolant system pressure test!

Toyotarx7

iTrader: (13)

well FYI the stock cooling gauge is ***....it reads cold, warm, and FUCKED, i highly suggest you getting a power FC w/ commander or an autometer water temp. gauge. the pwrFC assisted me ALOT! thats how i know exactly what my car is reading, BTW i have gauges im selling, i have water temp., oil temp., oil pressure and the 3-pod pillar plus the parts u need to hook them up, such as the water temp piece and the oil sandwhich for the oil gauges, im selling it all for 80 bucks if ur interested,

BUT anyways do u have a big funnel? ( that doesnt leak at the point where it connects to the car ) fill up what u can while the car is off and empty on coolant, pump ur top hose and u'll see the water go in and the air come out, once u notice that no more water wont go down, turn the car on, ( make sure u have a big enough funnel ) let it run for about 3 mins, while its running assist it by pumping the top hose line, but be careful not to hurt urself of course hahaha some people tend to forget that little detail haha but anyways, once u notice that no more coolant will do in, shut down the car and just let the coolant sit there, go have a few beers and let gravity play its role, after ur beer come back and pump the hose again..if u dont see any more bubbles that a good thing, dont forget to add water to ur AST can, and ur resivor tank behind ur passenger side headlight.... and just keep pumping that top coolant tube with ur hand....take ur time with it. i'll look for a link on that helped me too should benefit u

Toyotarx7

iTrader: (13)

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/big-fat-fd3s-cooling-thread-571088/


ok dude...this is the link, use it!! its great and has ALOT of information that may help you...the guys on this link know exactly what they are talking about, i gave u my personal experiences and how i resolved it but this link should have the key u need to fix ur problem, let me know how everything turns out, best of luck

mattgottheFD

iTrader: (6)

Hell yeah. Thanks again tmoney ill pm you tomorrow and ill pick up those gauges off you. Btw I can't work on my car till monday but ill definitly let you guys know how it goes. And yeah I definitly got to get a bigger funnel