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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Had no heat, flushed systems had warm defroster, it overheated now coolant running out somewhere on passenger side of engine


there are several things you could check-
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-check for rusted freeze plug on that side of engine.
some cars have so much stuff in the way it's hard to see exactly where the coolant is coming from, but if you use a bright light & do a little looking around you should be able to see the leaking area.

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Coolant leaks heavily from passengers side. Started yesterday morning on the way to work. I noticed the vents weren't blowing hot air. Then I noticed the car start to overheat. I didn't drive any more...


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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Your heater core has developed a leak (of coolant). The smell is the "sweet" smell of ethylene glycol,
a component of engine coolant. The white smoke is steam coming from the heated coolant evaporating.
The coolant is dripping into your duct work under the dashboard, and apparently being evaporated
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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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