My 300ZX overheats..again! - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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#1 (permalink) Old 06-03-2000, 08:01 PM
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My 300ZX overheats..again!

<HTML>Ok, a little over a month ago, my 93' 300ZX 2+2 started overheating (the temp. needle was about 3/4 high on the gauge). I went to a specialist in Austin, and he said that my waterpump was out. So, I got the water pump, themostat, and belts replaced. Now, a month later, I have the same problem (the needle climbs to about 3/4 high on the gauge) But this time, if I turn off the A/C, or if I'm constantly driving (moving), It won't overheat. Also, it only overheated when its extremely hot outside (95 degrees +) Today, it was only 89 degrees and I was in traffic, and it didn't overheat...even with the A/C on. Is this a one time thing, or should I be worried? Thanks. </HTML>
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#2 (permalink) Old 06-04-2000, 01:32 AM
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RE: My 300ZX overheats..again!

<HTML>dear sir

I have a 93 and mine is doing the same thing
if you find out what is wrong please e-mail me

magcamaro@aol.com


chig wrote:
-------------------------------
Ok, a little over a month ago, my 93' 300ZX 2+2 started overheating (the temp. needle was about 3/4 high on the gauge). I went to a specialist in Austin, and he said that my waterpump was out. So, I got the water pump, themostat, and belts replaced. Now, a month later, I have the same problem (the needle climbs to about 3/4 high on the gauge) But this time, if I turn off the A/C, or if I'm constantly driving (moving), It won't overheat. Also, it only overheated when its extremely hot outside (95 degrees +) Today, it was only 89 degrees and I was in traffic, and it didn't overheat...even with the A/C on. Is this a one time thing, or should I be worried? Thanks. </HTML>
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#3 (permalink) Old 06-04-2000, 12:55 PM
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RE: My 300ZX overheats..again!

<HTML>i had the same problem like a few weeks ago untill i fixed it..um..my guy took up the radiator. told me he was going to clean the crap out of it..and then dip it in some kinda of stuff..he told me since its a 90 and it seems like the radiator never been change and still looks good..its just really dirty...he showed me the radiator after he took it out..and man was it dirty...few hours later came back and pick my car up...pop my hood took a look..i was so suprised my radiator was Chromed! i thought it was just black..=P.. well now the car is driving great..</HTML>
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#4 (permalink) Old 06-05-2000, 07:07 PM
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RE: My 300ZX overheats..again!

<HTML>Your overheating problem sounds similar to the one that I have. During cooler times of the year, when it is not hot enough to require the air conditioner, the temperature is normal. However, as soon as it is warm enough to require the air conditioner, the water temperature slowly begins to climb upwards. On very hot days, I can not use it at all.

Precision Z in Canoga Park, CA, diagnosed it as a faulty fan. The declutching fan is supposed to free wheel when not needed and the change in viscosity when the temperature increases is supposed to make it act as a rigid connection, causing the fan to match the engine RPM. The fans are costly so I still have not replaced it to prove that this is the problem but this problem was encountered with a complete engine rebuilt with all new water pump, thermostat, and hoses. I did not replace the fan at that time, much to my dismay.

Anyway, I hope this information is of some use to you.

Don Gorney</HTML>
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#5 (permalink) Old 06-06-2000, 07:03 AM
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RE: My 300ZX overheats..again!

<HTML>have u tried gettig ur radiator checked 4 calcium build, and get ur intercooler ckecked out.</HTML>
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#6 (permalink) Old 06-07-2000, 03:07 AM
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RE: My 300ZX overheats..again!

<HTML>well what happened to me was, the overfill reservoir for the coolant and water, had a puncture, high up in the plastic, so whenever the car would get hot, the water would spill out, and every month or so, the car would overheat, cause there was not water. one solution just add water every few weeks, another put a new reservoir</HTML>
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#7 (permalink) Old 06-07-2000, 12:54 PM
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RE: My 300ZX overheats..again!

<HTML>Well i had the same problem on my '90 NA (2+2) and it turned out to be the fan clutch. The fan clutch is needed to keep the engine temperature respectable when you are not moving. The fan clutch brings in air to the engine, so that explains why you are overheating on hot days and not on cool days as well as your engine overheating when you are at idle and not overheating when you moving. One tip of advice I received to make sure if it is your fan clutch, because it's not a cheap part, is to put your thumb on the fan with a little pressure on it and have someone start the engine. If your thumb can keep the fan from moving then its your fan clutch. Don't worry it won't chop off your finger. Good luck</HTML>
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#8 (permalink) Old 06-10-2000, 02:14 AM
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RE: My 300ZX overheats..again!

<HTML>It's a little more comfoting to know this seems to be a common problem. I have a similar posting on my temp guage. Mine too climbs to 3/4 high on the guage. I hadn't thought of a fan clutch but I'll try that test to see. I live in the south and the weather could be a varible in the problem. However my 91 TT climbs whether the a/c is on or not, and only after 30 min of driving or more. I appreciate any help that can be given.
thanks
Nick</HTML>
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#9 (permalink) Old 08-28-2001, 01:52 PM
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RE: My 300ZX overheats..again!

My 93 does the exact same thing, its a common problem. I only got hot when parked for a long time with the AC on. I figure Ill worry about it in the spring, Not too many more 85-90 degree days left here in NJ...

Mike

1993 Black Convertible z32
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