lm71z Posted May 8, 2010 Share #1 Posted May 8, 2010 Our 240z's engine was just rebuilt and all the parts in the engine compartment were replaced with new ones. Before the engine was rebuilt, the temperature would almost always stay under half, even though it had a slightly blown head gasket and the original radiator. Now, for some reason, the temp is always over half way. We're confused about what the problem could be, because a new CSF radiator was installed along with a new Nissan fan clutch and a new Nissan 160 degree thermostat. Maybe the temperature sending unit could be inaccurate? If anyone has any ideas, please feel free to pitch in. Link to comment Share on other sites More sharing options...
Travel'n Man Posted May 8, 2010 Share #2 Posted May 8, 2010 Radiator Shroud was my fix - Cool!! Link to comment Share on other sites More sharing options...
lm71z Posted May 8, 2010 Author Share #3 Posted May 8, 2010 Radiator Shroud was my fix - Cool!!I've heard that can fix it. Does it matter if it's a metal or plastic shroud? Is MSA's fiberglass one any good? Link to comment Share on other sites More sharing options...
Inf Posted May 8, 2010 Share #4 Posted May 8, 2010 I've heard that can fix it. Does it matter if it's a metal or plastic shroud? Is MSA's fiberglass one any good?I've got MSA's fiberglass shroud, and it worked fine for me. I don't recall seeing a big difference in temperature, though. Link to comment Share on other sites More sharing options...
Pomorza Posted May 8, 2010 Share #5 Posted May 8, 2010 What are you using for coolant? How does your radiator cap look like? Jan Link to comment Share on other sites More sharing options...
John Coffey Posted May 8, 2010 Share #6 Posted May 8, 2010 Its not a problem. Link to comment Share on other sites More sharing options...
MikeW Posted May 8, 2010 Share #7 Posted May 8, 2010 I'd try to get an accurate temperature reading to be sure but every car I've ever driven when fully warmed up has read just over half way. I'm actually surprised that yours showed less than half before. Link to comment Share on other sites More sharing options...
Arne Posted May 8, 2010 Share #8 Posted May 8, 2010 Mine reads just to the right of halfway also. I wouldn't worry about it. Link to comment Share on other sites More sharing options...
GreenZZZ Posted May 8, 2010 Share #9 Posted May 8, 2010 I'll dogpile... In summer mine always runs 2/3 up while idle and a bit over 1/2 when moving. Out of summer, it runs 1/2 to a bit over 1/2. Link to comment Share on other sites More sharing options...
Walter Moore Posted May 8, 2010 Share #10 Posted May 8, 2010 Get a meat thermometer. Put it in the top of the radiator. Start the car and let it idle until it gets full up to temperature. Check the temperature of the actual radiator fluid. You will feel better. Trust me. Link to comment Share on other sites More sharing options...
Pomorza Posted May 9, 2010 Share #11 Posted May 9, 2010 No to hijack this thread, but my 280z runs pretty much at or below the middle mark on the gauge. According to the laser heat gun I have the rad sits about 160 and the upper hose at ~170. Are the gauges that inaccurate on older Z's?Jan Link to comment Share on other sites More sharing options...
Inf Posted May 9, 2010 Share #12 Posted May 9, 2010 ...Are the gauges that inaccurate on older Z's?I would say so, very imprecise anyway. When I first got my Z I had a lot of cooling problems (genuine overheating). It turned out I had some obstructed water passages from rust. An engine rebuild later, and the temperature still read fairly high, sometimes 3/4 across on hot summer days (same sensor it came with). So far as I could tell, everything was working properly - the thermostat seemed to be controlling the flow appropriately, and I wasn't having any more overheating problems.At the time, I had just moved to Austin and I didn't have a private garage to work on my car in, so I got into the rather costly habit of taking my Z to the local Z mechanic. I complained about the high temperatures, and he just replaced the sensor with another one he had laying around. I'm not sure if it was rigged to satisfy this fussy customer or not, but the temperature now tends to stay slightly below half-way, and only gets to half-way on really hot days. I should probably get my meat thermometer out and see for myself... Link to comment Share on other sites More sharing options...
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