Question about 1990 Nissan 300ZX

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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?

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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.

Posted on Jul 27, 2008

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there are several things you could check-
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Ok, may i suggest that you check your HEATER COIL, you can located it by pulling up " HEATER COIL" for your specific vehicle, this is what your coolant travels thru while hot and air passes thru this coil to produce the heat to warm your vehicle and typically the heater coils are located on the passenger side. Now as far as the leak location, check heater coil connections it could be the coil itself. GOOD LUCK!

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that is where your heater core is. Its leaking, or the feed hose to the heater core is leaking. You really need to pull the plastic cover off, just below the dash on the passenger side to look. the heater core looks like a small radiator. If coolant is leaking out of it, replace it. the coolant will cause problems in the long run, if you don't fix it now. After fixing it, steam clean the passenger side of the suv, to stop having a smell, and stop the corrosion. hope this helps

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Sounds like the heater core (a small radiator of sorts under the dash) is leaking or a hose going to it is leaking. If in a warm climate, you could bypass or block the heater hoses temporarily. Their only purpose is to make heat avail to interior of car. The 2 heater hoses either connect to feedthru's at the firewall or simply pass thru the firewall to the heater core. Every car I've seen has it on passenger side.

Peer up under the dash, it should be clear where it's coming from.

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