Does anyone else like the sound of a frozen radiator fan? - Page 2 - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #11 of 15 (permalink) Old 08-27-2019, 03:21 AM
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Originally Posted by pilgrim View Post
I agree the stock ZX fan is perfectly adequate for the vehicle if the shroud is in place and the radiator is working well. For the last year or so my AC booster fan hasn't been working, but I can drive with the AC on during hot (90+) days and it's only if I get stuck in stop and go that the engine starts to heat up past what's desirable. Then I kick the AC off. I'm still looking for the problem...
i don't recall having an AC booster fan on my 83. am i missing something?
i think you might have another issue that's causing you to run hot at idle. my Z31 was doing the same thing here in UAE and its very hot outside now (115+ F)
so my mechs found that the fan clutch and thermostat had failed. so I replaced the clutch itself, and the thermostat, flushed the system and its running nice and cool now.

make sure your radiator cap is holding pressure and your water pump is not going bad in addition to checking your clutch fan and thermostat. if all these items check good and its still running hot, well, unless you have some kind of block in the system, i'm not sure what else could be causeing your temp to rise at idle

Bon

All the Gods, all the Heavens, all the Hells, are within you. - Joseph Campbell -

Pooja II ~ 1984 300ZXT 50th AE ~ 2018 - 2019
Pooja ~ 1987 300ZX 2+2 NA2T ~ 2012 - 2018
Suzanna ~ 1983 280ZX Coupe ~ 2010 - 2019
Alana ~ 1976 280z Coupe NA2T ~ 2008 - 2019
Dianna ~ 1980 280ZX Slick Top ~ 2001 - 2007
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post #12 of 15 (permalink) Old 08-27-2019, 02:29 PM
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The ZX Turbo does have a second fan on the AC heat exchanger. Your other points are right on target, but the heating only occurs at 90+ temps in traffic where I'm stopped for minutes at a time. Fan has been replaced and radiator has been cleaned out.

Here are a couple of pictures - the fan is behind the grille on the passenger side of the car. Based on my experience, it's supposed to run when the AC is on.
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post #13 of 15 (permalink) Old 08-28-2019, 12:25 AM
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i gotcha now. its that AC condensor aux fan. my 83 is non-turbo no wonder. well, now my Z31 AE has this little fan infront of the condensor. i guess this was on all the turbo models to help with cooling. now my 87 which was NA had one as well. but it was not stock. someone over here installed it and wired it in and at the time i thought it was stock.
actually I think its good to have one of these even on non-turbo cars. my 87 never overheated during the summertime here with the AC always going and the little auxillary fan running.

i am really wondering whats causing your issue?? its very strange.

maybe your auxillary fan motor is dead and just needs replacement. you may be able to still get this part.

you know the only other thing i can think of is perhaps the stock clutch fan just can't keep up the cooling efficiency that it should. my 83 would do that sometimes when sitting in UTAH traffic and its not even hot there in the summer time. it never overheated, but it would definately run hot when idling. cooling system was in good condition too.

Bon

All the Gods, all the Heavens, all the Hells, are within you. - Joseph Campbell -

Pooja II ~ 1984 300ZXT 50th AE ~ 2018 - 2019
Pooja ~ 1987 300ZX 2+2 NA2T ~ 2012 - 2018
Suzanna ~ 1983 280ZX Coupe ~ 2010 - 2019
Alana ~ 1976 280z Coupe NA2T ~ 2008 - 2019
Dianna ~ 1980 280ZX Slick Top ~ 2001 - 2007

Last edited by bonfire79; 08-28-2019 at 12:29 AM.
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post #14 of 15 (permalink) Old 08-28-2019, 09:13 PM
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If you run high speed, I would be worried about fan failure and a blade coming off and causing a lot of damage under the hood.
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post #15 of 15 (permalink) Old 08-29-2019, 12:14 AM
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I checked my aux fan and it runs with 12V to it. I checked the leads to it and the system isn't sending 12V. The relay for it passes a continuity check. I suspect the problem is upstream, possibly in the lever assembly in the dash.
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