| Author |
Message |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 649
Reg: 01-2009
|
my car has recently been overheating, on short trips, not even 50kms and it seems to heat up
i think my gasket may be on the way out, would this cause this?
and recently i have had the radiator flushed and cleaned..
could it be the replacement bonnet i put on it, due to the fact the new bonnet has padding under it, and my old one didnt?
thanks! |
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31
Posts: 10783
Reg: 11-2004
|
Most likely thermostat. The bonnets are normally padded. |
Blake Gloyn
TryHard
manawatu
soarer JZZ30 TT
Posts: 498
Reg: 02-2006
|
replace the thermostat now. the heating of the motor can actually flush scale/gunge out the water galleries and can block the radiator up again. My thermostat went, and did exactly that. |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 651
Reg: 01-2009
|
really? even though the car actually does get really hot easily?...
what are thermostats worth?  |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 249
Reg: 12-2006
|
thermostats govern the cooling flow. pulling it back under 87'C and cranking it wide open over 87'C... if you have a dodgy thermostat you'll know about it... one notch up on that piss weak lcd gauge and your already over 110'C. to test u're thermostat..... (cold) pull the radiator cap off like you would the cap on a wild turkey on a friday arvo (hot) use caution.... leave the cap off, have a hose/bucket ready.. start the engine, if u did the turkey option.. drink turkey whilst the engine warms up... if your already hot then there shouldn't be water flooding out everywhere like a gyser...it should emitt maybe a bit of steam.. keep the water level up as the engine heats up.. this is an effective way to bleed your cooling system of air pockets as well.. this is also a way of testing for head gasket issues as there will be bubbles and gyser like qualities protruding from the radiator.... if you get to the bottom of your turkey/carefactor/piece of string, or wat ever your using to mind the time, and the water at the top of the radiator isn't hot, feel the top and bottom hoses. if the top one is hot as f*** and the bottom one is cold as s*** then your thermostat is U/S..
another common cause of overheating is the radiator cap not sealing properly.. the normal max pressure in a standard snot box is 15psi.. if the radiator cap can't handle that then that's your problem right there
if you have no idea wtf i just said then take it to a mechanic.. |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 654
Reg: 01-2009
|
hmmm yeah i understand, im pretty sure my radiator cap is fine its a solid and new cap...
its possible it could be a dodgy thermostat which could also cause the radiator to clog up again as someone was saying....
what are thermos worth? |
Cameron Laufer
DieHard
Queensland
 Built 1.5j 425.8rwkw & LPG 1jzgte 204rwks @ 10psi
Posts: 816
Reg: 12-2007
|
Also the standard thermostat is 82 degrees |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 254
Reg: 12-2006
|
haha sorry cameron was 4 out ;-P
repco should have them on the shelf shouldn be too dear....
if your thermostat has been blocked and you just change it out with a new one.. chances are you will loosen the blockage and send it into the top or the radiator.. be a good idea to get the cooling system flushed out if there is any residue or crusty stuff... squeeze the radiator hoses.. if they are crunchy, get it all flushed and use some toyota red coolant.... |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 262
Reg: 12-2006
|
i think ive joined your club ty, i put my car on the dyno tonight and it only made 186rwkw.. my heart sank.. it also got to over 120'c which isn't good... has anyone had troubles with heat on the dyno??? i think ill be doing a few radiator upgrades before i look into any more performance upgrades.... |
Josh Totall
Tinkerer
SA
TT Manual & TT Auto
Posts: 19
Reg: 06-2009
|
if its still a factory radiator it could be fairly blocked depending on how it has been treated over the years. |
Rob Rojo
Goo Roo
NSW
Soarer TT & UZZ31
Posts: 2721
Reg: 12-2007
|
A couple of months ago my car starting running hotter than normal (1 bar above half) turned out to be the cap even though it still looked good.
About 10 seconds and $20 later all sorted. |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 265
Reg: 12-2006
|
yea.. i had the radiator fully reco'd. new water pump and thermostat, 2x 10' thermo fans and a new radiator cap.... ive pressure tested it. ran toyota red, truck coolant and standard coolant... it's fine on the highway or around town.. sits about 87'c which i thought was pretty moist... but when you sit still and do a burnout or dyno she pops the cork and floods the overflow bottle.. i'm thinking the thermos are insufficient.. anyway. getting a aluminium radiator from neil (thanks neil) and i'll put a 12' behind it and a 12' infront of it.. push pull set up and see how that goes..
any suggestions?...... |
Rob Rojo
Goo Roo
NSW
Soarer TT & UZZ31
Posts: 2723
Reg: 12-2007
|
Head Gasket? |
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual
Posts: 882
Reg: 10-2008
|
headgasket is very likely, pressure passing from the cylinders into the coolant galleries will cause excess pressure within the system and release the pressure valve in the rad cap.
Does it blow bubbles out the radiator when idling? Constant bubbles popping up through where the cap is is a sure giveaway of a Headgasket.
Otherwise take it to a shop and get them to test the coolant for hydrocarbons from combustion gasses passing into the coolant, and get them to leak test the cylinders |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 266
Reg: 12-2006
|
na no little bubbles.. i'll do a chemical test at work tomorrow and see what happens.. last compression test showed that they were all 170 something.. |
Rob Rojo
Goo Roo
NSW
Soarer TT & UZZ31
Posts: 2724
Reg: 12-2007
|
Try another Rad Cap, I know its new but it may be faulty. |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 268
Reg: 12-2006
|
this is true.. i'll look at my thermostat as well dyco are renown for dodgy thermostats... cpc i think were always a good brand???? |
Rob Rojo
Goo Roo
NSW
Soarer TT & UZZ31
Posts: 2725
Reg: 12-2007
|
I doubt it will be the thermostat as if it doesn't over heat during normal driving I would say its opening as it should. |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 269
Reg: 12-2006
|
also true... but when i had it on the dyno it went up past 120'c and the radiator cap started s*itting bricks... i thought that's what they were designed to do.. keep a max amount of pressure and release any extremes??
this discussion is making me lean towards my thermo set up being crap..
i have them set to kick in just as the top radiator hose goes over 95'c and they cool it right back down to 87'c my thermofan sensor is in the top radiator hose and my water temp sensor has been tapped into that metal housing near the stock one... |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 657
Reg: 01-2009
|
does anyone have a DIY to the thermo? does anything need to be adjusted to the new thermostats? do they have to be set at some MM or need to be set at degrees wise or so?
newbie questions but all good things to know in the future |
Scott Wilkes
DieHard
Tasmania
92 TT Factory Manual
Posts: 883
Reg: 10-2008
|
noticed your a 2nd yeah mech mate, same well just passed over into 3rd year haha. |
Brett Cutts
TryHard
south australia
tt and a v8 again woo hoo
Posts: 221
Reg: 07-2008
|
Don't know about the tt's but my v8 used to get hot and push water out for no reason every now and again. It only really started after putting a new water pump and after market thermostat in it.Problem went away after going back to a genuine toyota thermostat which are very different to the recomended gates / dayco thermostat. Also the cpc radiator cap listing for a tt is incorect. They fit fine but the base seal is slightly different. They will hold pressure fine but will not recover from the overflow tank. Have a very close look the base washer on the correct cap has a small step where as the cpc listed aftermarket cap has a flat seal
Thermostat on the left is genuine Thermostat on the right is dayco listed aftermarket
hope this helps |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 658
Reg: 01-2009
|
thanks! kinda understood (still car retarded)
do these need to gapped or anything? |
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder
Posts: 5373
Reg: 03-2006
|
Mathew , I would suggest removing the thermo fans and refitting the factory toyota fan setup . Ive never had any issues with heat on the dyno, even a couple years ago, it was on the dyno for 2 hours straight without an issue. |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 661
Reg: 01-2009
|
would the thermostat be a diy?? just wanna avoid cost if possible are there different brands and kinds? |
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder
Posts: 5374
Reg: 03-2006
|
Get Genuine toyota thermostat buddy . Yes its an easy Job .
You will need to wait until car is cold to work on it. UNdo tap on bottom tank of radiator and drain coolant . Remove radiator cap .
Under the front turbo is the thermostat housing. It has 2 x 12mm nuts . Get yourself a 12mm Deep socket and long extension. UNdo the 2 nuts and you will be able to move the thermostat housing out of the way and remove the thermostat from the housing and replace it with the new one.
(It is optional to remove the radiator hose from the themrostat housing, just adds another step )
No sealant is used as the ruber O-Ring that comes with the new thermostat is the actual gasket .
Pop it back onto the studs and tighten up the 2 x 12mm nuts . Tighten the drain Tap on the bottom radiator tank and refill the system with new coolant ( toyota red ) . Start car and turn on heater . Allow the thermostat to open and continue topping up the radiator with coolant until it is full once car has warmed up. Replace Radiator cap and check overflow tank .
(I recommend a new radiator cap as well) .
Also, one morning in the following days before you start the car, just remove the radiator cap and check the coolant level . |
Ty Mackay
DieHard
WA
Soarer TT 1jz-gte
Posts: 662
Reg: 01-2009
|
lovely thanks mate that helps HEAPS! whats a new thermo from toyota worth? and whats the red coolant worth?... is it just better to run red than green, given the fact red is more expensive and puts a dent in my pocket haha! |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 270
Reg: 12-2006
|
daniel, my stock viscus fan decided it wanted to make friends wit my last radiator...... i would have to source a replacement... i would have to source a shroud as well because mine went into a million pieces when the viscus fan and radiator united into one big steamy twisted mess....
I thought having 2x 10" thermos would have done close to the same job as the standard fan.. but i guess theres no substitute for quality eh..
if this alloy push pull set up doesn do the job i shall cut my losses and revert back to the standard fan.
I gotta admit i haven't seen too many viscus fans selfdistruct... but when they do...... |
Matthew Werner
TryHard
Qld
jzz30 TT
Posts: 271
Reg: 12-2006
|
yeahya up the apprentice know-nothins woop woop hehe |
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