Question about 1990 Nissan 300ZX

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How do you remove the heaater core from a 300zx?

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Hi, you have to remove the dash completetly in order to access the heater core...i did it on mine and it's a big job..took about 14 hours........
Take care

Posted on Jul 29, 2010


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How do i take the heater core out? on a 1984 nissan 300 zx non turbo


Sep 11, 2011 | 1984 Nissan 300ZX

1 Answer

Heater core leak

change the heater core!
If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core.
Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Jan 05, 2011 | 1986 Nissan 300ZX

3 Answers

Replaced thermostat on 1984 300zx non turbo. no water leaking any where. still getting hot, only small bubbles in resivoir tank. top hoses very hot. lower hose not hot any suggestions?

you may have air trapped in the system, or there may be a blockage somewhere. usually, a blockage would be in the heater core. to check, remove both heater hoses going into the heater core and try to flush it out with a garden hose. it's also possible that the water pump is faulty.

Feb 05, 2010 | 1984 Nissan 300ZX

1 Answer

We have no heat. fuses are fine.

ck heater hoses,,if one is hot & other is cold..heaater core plugged,,does blower work

Jan 30, 2010 | 2000 Chevrolet S-10

1 Answer

Ford ka heater blows hot air all the time

Taurus does not use a heater control valve. It runs coolant thru the heater core constantly. You may have a temp blend door actuator problem or a plugged up heater core is also very common. Feel the heater hoses, they should both be very hot, it one is much cooler; you can try to back flush the core.

Mar 26, 2009 | 1999 Ford Taurus

1 Answer

1988 300zx non turbo, i have coolant and steam pouring into the passenger side of my car when it warms up. is that the heating coil and where exactly is it?

That does sound like a heater core issue. It's buried inside the dashboard on the passenger side - you'll likely have to remove the entire dashboard to access it. If you look under the hood, back at the firewall on the passenger side, you should see two hoses coming out of the firewall and into the back of the engine - these come out of the heater core.

It's a job that anyone with some basic knowledge and a decent set of hand tools can definitely do at home, but it's labor-intensive and will take quite awhile. Plan for a full day and maybe part of the next to do the job.

Jul 26, 2008 | 1990 Nissan 300ZX

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