gu patrol temp

Submitted: Tuesday, Jul 29, 2014 at 16:58
ThreadID: 108933 Views:1589 Replies:9 FollowUps:6
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hi all,
am on the road with 2009 patrol td3 and 1950kg caravan. on warm to hot days car seems to overheat particularly ascending bunya range. fitted with scangauge and engine watchdog. standard car temp gauge in middle, appear all well, and temp normal
scangauge normally sits on about 96-97c on one very steep incline it touched 101c and watchdog started screening at 97c .. coolant is nuloun long life approx 60%, fan seems to be running ok. has anyone any idea as to the boiling point of this liquid at this pressure?
is this a reasonable setting for the watchdog. and should i be concerned at this running temp.. average speed 80-90kph in 4th gear manual.....any advise would be appeciated as it is a little concerning not knowing how close to cooking the moter i may be
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Reply By: bill - Tuesday, Jul 29, 2014 at 17:06

Tuesday, Jul 29, 2014 at 17:06
sorry ,fokes forgot to sine off..........bill
AnswerID: 536796

Reply By: rod j2 - Tuesday, Jul 29, 2014 at 17:31

Tuesday, Jul 29, 2014 at 17:31
Hi Bill. I had a 2006 GU patrol TD30 auto. I can almost guarantee that the problem is a clogged radiator. It happened to me twice, and I know a couple of other blokes with the same problem. The radiators can be dismantled and cleaned out. $400-$500 by a competent radiator repair shop. It appears that the coolant breaks down with time. I don't think Nissan will admit to a problem!
AnswerID: 536797

Follow Up By: Alan S (WA) - Wednesday, Jul 30, 2014 at 09:57

Wednesday, Jul 30, 2014 at 09:57
Hi Rod

I wouldn't say it is a nissan only problem, all coolant breaksdown over time.

It also appears that as part of the braeking down the PH levels change which can then increase corrosion in alloy components.

I was always told to flush out and change coolant every 2 years.

Alan
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FollowupID: 821060

Follow Up By: Batt's - Friday, Aug 01, 2014 at 12:48

Friday, Aug 01, 2014 at 12:48
Why spend $400 -$500 cleaning the radiator out when you can buy a new one for that I think you're being ripped off. I think you'll find if your towing you should get the cooling system pressure flushed every year to keep it in good condition and it won't cost the price of getting a new radiator.
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Reply By: pepper2 - Tuesday, Jul 29, 2014 at 18:10

Tuesday, Jul 29, 2014 at 18:10
Bill your temperatures are the same as I had on several patrols that I owned , not overheating.
Btw I believe the cooling liquid should be 100 % coolant no dilution to give best corrosion protection and highest boiling point.

All the best.
AnswerID: 536801

Follow Up By: Robin Miller - Tuesday, Jul 29, 2014 at 20:33

Tuesday, Jul 29, 2014 at 20:33
Hi Pepper

No so good to use that much Glycol coolant , it doesn't conduct heat as well as water, in fact while I'd reccomend Bill get his radiator checked first I suspect that a part of his problem is his 60% mix.

If it was just heat transfer then nothing beats plain water with a higher pressure cap to allow its boiling temp under pressure to rise , however there are other factor such as corrosion etc.

Assuming he finds no other faults I would suggest a return to 1/3rd mix which is all thats required for down to minus 15c as per Nissan.


I also reccomend a slightly higher radiator cap rating to raise the boiling point a little.

I use 1.4 bar and also have a 1.7 which I carry as spare.

Higher bar caps can be a little hard to find , but all the bike shops carry them as they are used on most motocross bikes , mine is from Honda.
Robin Miller

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FollowupID: 821027

Follow Up By: pepper2 - Tuesday, Jul 29, 2014 at 23:15

Tuesday, Jul 29, 2014 at 23:15
Robin from memory nissan specifies 100% coolant no water...
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FollowupID: 821043

Follow Up By: Robin Miller - Wednesday, Jul 30, 2014 at 08:11

Wednesday, Jul 30, 2014 at 08:11
Hi Pepper

No , not a chance actually - its interesting and easy to think that if glycol reduce freezing temp and cooled better then adding more would be better and lower freezing temp even more , but if you plot it its actually a bathtub curve , and freezing temp actually rises beyond about 60 % mix.

It doesn't get cold enough in Aussie land , the figure I gave you is from Nissan manual which is a 30/70 mix down to -15 and 50/50 mix for cold countries which works down to -35c

I would never use more than 25% as cooling performance gets degraded .
Robin Miller

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Reply By: bluefella - Tuesday, Jul 29, 2014 at 19:03

Tuesday, Jul 29, 2014 at 19:03
hi Bill
I wouldn't be to worried about 101c towing those kg's, my cruiser would see those temps under similar conditions, my van is about the same kg's.
AnswerID: 536807

Follow Up By: bluefella - Tuesday, Jul 29, 2014 at 19:06

Tuesday, Jul 29, 2014 at 19:06
Should add I have my watchdog set on 105c, then back off and. select lower gear
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Reply By: howesy - Tuesday, Jul 29, 2014 at 19:11

Tuesday, Jul 29, 2014 at 19:11
boiling point wont change all that much but does increase under pressure.

Water – Pressure and Boiling Point

Pressure Boiling Point

Psi kPa bar deg F deg C
0.5 3.45 0.034 79.6 26.4
1 6.90 0.069 102 38.7
2 13.79 0.138 126 52.2
3 20.69 0.207 141 60.8
4 27.58 0.276 153 67.2
5 34.48 0.345 162 72.3
6 41.37 0.414 170 76.7
7 48.27 0.483 177 80.4
8 55.16 0.552 183 83.8
9 62.06 0.621 188 86.8
10 68.95 0.689 193 89.6
11 75.85 0.758 198 92.1
12 82.74 0.827 202 94.4
13 89.64 0.896 206 96.6
14 96.53 0.965 210 98.7
14.69 101.3 1.01 212 100
15 103.4 1.03 213 101
16 110.3 1.10 216 102
17 117.2 1.17 219 104
18 124.1 1.24 222 106
19 131.0 1.31 225 107
20 137.9 1.38 228 109
22 151.7 1.52 233 112
24 165.5 1.65 238 114
26 179.3 1.79 242 117
28 193.1 1.93 246 119
30 206.9 2.07 250 121
32 220.6 2.21 254 123
34 234.4 2.34 258 125
36 248.2 2.48 261 127
38 262.0 2.62 264 129
40 275.8 2.76 267 131
42 289.6 2.90 270 132
44 303.4 3.03 273 134
46 317.2 3.17 276 135
48 331.0 3.31 279 137
50 344.8 3.45 281 138
52 358.5 3.59 284 140
54 372.3 3.72 286 141
56 386.1 3.86 288 142
58 399.9 4.00 291 144
60 413.7 4.14 293 145
62 427.5 4.27 295 146
64 441.3 4.41 297 147
66 455.1 4.55 299 148
68 468.9 4.69 301 149
70 482.7 4.83 303 151
72 496.4 4.96 305 152
74 510.2 5.10 307 153
76 524.0 5.24 309 154
78 537.8 5.38 310 155
80 551.6 5.52 312 156
82 565.4 5.65 314 157
84 579.2 5.79 316 158
86 593.0 5.93 317 158
88 606.8 6.07 319 159
90 620.6 6.21 320 160
92 634.3 6.34 322 161
94 648.1 6.48 323 162
96 661.9 6.62 325 163
98 675.7 6.76 326 164
100 689.5 6.89 328 164
105 724.0 7.24 331 166
110 758.5 7.58 335 168
115 792.9 7.93 338 170
120 827.4 8.27 341 172
150 1034 10.3 359 181
175 1207 12.1 372 189
200 1379 13.8 382 194
AnswerID: 536808

Reply By: Erad - Wednesday, Jul 30, 2014 at 08:55

Wednesday, Jul 30, 2014 at 08:55
Howsey:
The pressures you quote are absolute pressures, not gauge pressures. Normal atmospheric pressure at sea level is about 14.7 psi. If you put a 16 psi cap on your radiator, the maximum absolute pressure in the system will be 30.7 psi (16 + 14.7 psi), and your boiling point will be about 122 Dec C at sea level. As you get higher, the absolute pressure drops off, but the 16 psi cap on your radiator still keeps the boiling point up.

So to answer the question raised by the original poster (is 101 Deg C too high), I would say that it is probably OK. There will be local hot spots in the engine and the scangauge is only measuring the average temperature, but I would say that, assuming your radiator cap is pressurising OK, there is enough margin with about 20 Deg C to boiling point.
AnswerID: 536834

Reply By: Member - mechpete - Wednesday, Jul 30, 2014 at 11:09

Wednesday, Jul 30, 2014 at 11:09
97degrees is not too hot .
all the emission controls are set to work at around 90degrees operating temp .
for every one degree of pressure it raises the boiling point 3 degrees .in the old scale
won,t hurt the engine unless you lose coolant ,
mechpete
AnswerID: 536841

Reply By: Gronk - Wednesday, Jul 30, 2014 at 11:16

Wednesday, Jul 30, 2014 at 11:16
101 deg is OK...the 4wd is working , but not all that hard ..yet...

My previous Challenger would go straight to 100 deg ( towing a small van ) as soon as it saw a hill....then if the hill was big enough it would head towards 110 and once on a mother of a hill ( just past Tamworth ) it reached 116, which by this time the gauge had started to move up..

My current 4wd ( 200 series ) doesn't do the same, but will still get to 100 on a bad enough hill..

The trouble with a scangauge ( or Ultragauge ) is you worry too much watching the temp go up...but all the while the original gauge doesn't move..

But, you get to know at what level the original gauge starts to move up from it's normal position ( if it ever gets that hot )....which means you get to know how much leeway you have before backing off..

I certainly wouldn't worry about any temps below 110 ( unless it was running that hot a lot of the time )
AnswerID: 536842

Reply By: bill - Wednesday, Jul 30, 2014 at 19:40

Wednesday, Jul 30, 2014 at 19:40
thank you all, for your responses, its a great site and reassuring to have expert advice so close at hand.. does anyone no the pressure cap value for this patrol, thanks again

bill..................
AnswerID: 536866

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