A/C heat not working

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
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Sonic_ZX
Posts: 4
Joined: Mon Jun 27, 2011 2:23 pm
Car: 1990 Nissan 300zx TT

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I've got a '90 Z TT, and A/C and heat are not working.

I tried replacing the A/C control pod, but its still not working. It just blows out air, and the only thing that works is the speed of the blower.

The temp settings don't work and the settings for defog and what not aren't working either.

I've checked the fuses and none of them are blown.

Anyone know what the issue could be?


marty1mc
Posts: 733
Joined: Sat Jan 16, 2010 1:51 am
Car: 1990 300zx TT - Z owner since 2003
Location: Fuquay Varina,NC

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You may want to check the AC computer. It is located beside the heater box above the accelerator pedal.

Hank857
Posts: 12
Joined: Thu Jul 21, 2011 9:00 pm
Car: 300 TTZX

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what do check for on the ac computer? is there a reset or something?

marty1mc
Posts: 733
Joined: Sat Jan 16, 2010 1:51 am
Car: 1990 300zx TT - Z owner since 2003
Location: Fuquay Varina,NC

Post

Normally, you run diagnostics to check the computer. If you aren't getting anything start with the fuses, recheck since you have already. Here is the layout of the fuse box.

http://www.300zx.co.uk/tech/fuse-translation.htm

If not, use this diagram and check to make sure the computer is getting voltage and ground, check connections, look for broken wires. But, you may need to swap out the computer at some point...

http://www.ttxtz.com/tech/lee/Wiring-Co ... _32-39.gif


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