Hi Guys,

I Have Finally Thrown In The Family Battle Bus For My New Baby A 92 N/a Manual 300zx, The Only Thing I Can Find Wrong With It Is The Heater Blows Full On Hot All The Time Even When The Aircon Is Switched On, Does Anyone Have Any Ideas?

Cheers

Sounds like one of the sensors is disconnected under the dash which causes exactly this problem.

Easiest one to check is on the plastic pipe that guides air to the door vents.

Take off the panel below the steering wheel and you might see a connector unplugged on the pipe.

If it's not that one there are a couple of others you could investigate in the online service manual here.

Hi. It sounds like the water regulating valve may be jammed. It's a bugger to see but deep behind the centre console you should find where the heater matrix pipes make their way through the bulkhead/firewall. On one of them lies a white valve which is controlled by a cable (similar to a choke or throttle cable.) The cable may have come off, or the motor which drives it might be defective.

 

One of the temperature sensors might also be defective, which could cause the computer to think that it's freezing cold inside the car! Check this out:-

 

http://www.ttzd.com/tech/autocc/autocc.html

 

Cheers

Dave

Firstly welcome to the nut house.

 

Link to online service manual is here

 

http://www.300zx-twinturbo.com/cgi-bin/manual.cgi

 

It may also be fuse perhaps ??

 

Darrell

Thanx Guys

The heavens have just opened here so will have a look when i get to my workshop in the morning.

are there many meets in the south west i know of only three z's in my area and would like to see more

Cheers

Jon

Or it may just need regassing!