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Shaun Luckhurst
Tinkerer
SA
TT

Posts: 41
Reg: 07-2005

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Sunday, November 04, 2018 - 06:22 pm, by:  Shaun Luckhurst (Pornus) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I was driving today and noticed that the temp gauge was sitting one bar higher than normal (not a particularly warm day). It stayed the same for about 20km but then as I literally got home the temp gauge just hit max. In the Engine Coolant Holder the coolant was bubbling and some had leaked out. It was all very hot. There does not seem to be any piping leaks. I'm a bit perplexed what could be causing the overheating and causing the Engine Coolant Holder at the front of the radiator to bubble. Any ideas?
Shaun Luckhurst
Tinkerer
SA
TT

Posts: 42
Reg: 07-2005

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Sunday, November 04, 2018 - 06:23 pm, by:  Shaun Luckhurst (Pornus) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Its a TT.
Shaun Luckhurst
Tinkerer
SA
TT

Posts: 43
Reg: 07-2005

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Sunday, November 04, 2018 - 07:52 pm, by:  Shaun Luckhurst (Pornus) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I filled up the Engine Coolant Tank with coolant and let the engine run and could hear the coolant being sucked into the radiator. The tank was dry so I filled up again and repeated. Then I noticed that the coolant was bubbling as though hot and flowing out of the overflow pipe. Help appreciated of what might be the issue.
Blake Gloyn
Goo Roo
manawatu
soarer JZZ30 TT

Posts: 1371
Reg: 02-2006

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Sunday, November 04, 2018 - 07:53 pm, by:  Blake Gloyn (Blakenz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

If your radiator is in good nick, then it is likely your thermostat has failed, and is shut! replace the thermostat. You can do it yourself if you are flexible and patient.(two nuts to undo)
a cheap fix, provided the engine isn't damaged, though sounds like you might have caught it just in time.
Tai Johnsen
Goo Roo
QLD
JZZ30 Pov Manual LSD & black! + 89 Z20 Aerocabin

Posts: 1800
Reg: 04-2006

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Monday, November 05, 2018 - 10:09 am, by:  Tai Johnsen (Privatejohnsen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

For future reference, one bar higher than normal is already overheating (over 105 deg C)

If you ever see this again pull over as soon as possible and see whats causing it.
Mark Tierney
DieHard
NSW
JZZ30 GTT-L Built 1.5JZ Beast, UCF11, IS250, GS350-FSport, Ducati SS

Posts: 696
Reg: 09-2005

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Monday, November 05, 2018 - 10:31 am, by:  Mark Tierney (Mark_t) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Only toyota red coolant, ever. Yep, Blake's on the money. Most likely the thermostat.
A professional flush and completely change the coolant. you wont believe the gunk that comes out on a pro flush anyways.
A professional can also tell you of the condition, and whether the radiator needs a service or change.
Did the current coolant have any colour/murkiness in it or residue around the radiator cap when you removed it (and does it currently have toyota red in it?)
Blake Gloyn
Goo Roo
manawatu
soarer JZZ30 TT

Posts: 1372
Reg: 02-2006

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Monday, November 05, 2018 - 07:37 pm, by:  Blake Gloyn (Blakenz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

When my thermostat failed, on my first Soarer, the heat it caused, loosened a whole lot of crud from the cooling system(most likely the water galleries of the motor) which then got caught in the radiator, so end tanks were taken off, and core was cleaned.
Ross Pesina
Goo Roo
Vic
JZZ30, JZA80 TT, Z32 TT

Posts: 1112
Reg: 08-2006

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Tuesday, November 06, 2018 - 06:50 am, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

These engines are getting old and a LOT are neglected. Because the cars are so cheap don't like to waste money on maintenance.

I've had this happen to me in a couple of times in a jzz30 and and a uzz31 and each time it was a bad head gasket.

I'd still try a new thermostat and decent coolant flush.

Fyi you don't need to run red coolant, this has been covered many times on here, just need to make sure it's ethylene glycol.
Tom Claffey
Tinkerer
NSW
V8

Posts: 6
Reg: 09-2014

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Thursday, November 08, 2018 - 12:46 pm, by:  Tom Claffey (Tom_claffey) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mine ran hot the other day but it was 37degrees and towing a heavy trailer up hills (we may have the only Soarer with a towbar?) Backing off throttle and turning off AC up hills kept temp in normal central range - when I get car home it will get a radiator flush!
One tip; if you keep filling with coolant and it still overheats one cause can be an airlock - there is a square plug on front of engine at highest point, remove and prime with coolant to fix airlock.

Sorry, this is on V8 not TT.
Ross Pesina
Goo Roo
Vic
JZZ30, JZA80 TT, Z32 TT

Posts: 1113
Reg: 08-2006

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Friday, November 09, 2018 - 07:22 am, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

V8 is different to TT.
Ive never had airlock issues in a TT and always a problem with the V8 unless you fill from that big bolt.

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