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Zd30- When mechanic replaced tran fluid he noticed the fan shroud was against the radiator core and was rubbing through. Rad and rad hoses replaced. New fluid, I don't know what brand. Went where I have been before and the temp rose to 105 before I pulled over and let it idle down. Spoke to mechanic. Replaced water pump and thermostat. No change. Travelled the same road again today and temp peaked at 112. At 110 k it sits on 90. Only other thing is normal temp is 88. I think before it was 85.

For those who are wondering. I am waiting for word back from RACQ re the IP.
 

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So it started overheating after new rad? Wonder if the possible 2 different coolants have mixed( or did he full flush block and all) and pooped your new rad already.is the thermostat a genuine nissan unit? I have had troubles with aftermarket ones taking me to mid to high 90s. Make sure all your plastic shrouds and deflectors are in place and foam is on your rad between it and the ac core.
 

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Y2KGUII ZD Wgn
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Just to add to what Muzz said, when coolant is changed a lot of care is needed as air is easily trapped in pockets resulting in hot spots particularly in the head, keep checking your small overflow bottle (the one right at the front and see if you are getting any significant movement there, cold to hot you will normally see around a 10-12mm rise in the level.

What your experiencing is right at the extreme end though.
 

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Discussion Starter · #4 ·
Don't believe it is air as I have travelled 2000k this week and the level has not changed. I was there when the mechanic dropped the fluid to replace the ip and there was no sign of grunge in the water. I would have thought that I would have seen something if it was a case of different coolants reacting with each other. Thermostat is genuine. All shrouds are intact and in place.
 

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Double check the rad caps are the correct way around.
Non pressure to rad and pressure cap to overflow.
Interesting though, mine runs slighty hotter since new rad, water pump and thermostat.
 

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hmmmm yes weird enter scratch head emoticon here---> (by the way mods we need one of these dagnabbit)

Overheating with everything new? At cruise the temps are 90C on the highway? That's a tad warm but not extreme. Whats the go when one fits a replacement IP? Is there tuning involved after that? I mean Dyno/ checking AF's?

Is the replacement IP pumping too much fuel now? I don't know too many things changed at once so how would one narrow down the problem.Timing?
 

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RE Rad

Try rodding the radiator. I purchased a new radiator, had it installed and had overheating from day one. Looked at several different causes took it to a local radiator specialist who removed top tank. You could see the cores were partially blocked. rodded it out, no problems since.
Even brand new have problems in manuafacture
 

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Yes. My adrad states on the warranty paperwork along the lines of......block and heater core must be reverse flushed and all traces of old coolant removed to eliminate cross contamination and reaction resulting in blocking of new radiator core.

Hence I asked Jim if his mechanic did this in a previous post.. I'm no coolant guru but apparently 2 different types can fark a new rad within moments no matter how miniscule the cross contamination is.
 
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