Heater

A home for 1983–1989 300ZX owners!
300 z man
Posts: 33
Joined: Wed Aug 22, 2007 2:01 pm
Car: 1988 300 ZX

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QuestionI have a 88 300zx and the heater will not work. The fan runs but only blows cold air. When I accel. hard, hot air will come out of the vents but when I get back to normal, cold air. What do I check first?


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Perrenial Badass
Posts: 405
Joined: Wed Jun 04, 2008 3:32 pm
Car: 1973 240Z, 1986 300ZX, 1987 300ZX, 1984 Corvette
Location: Florida
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I wish my Z31 only blew cold air. My ****'s a microwave. Anyway, you have a vacuum leak. Somewhere under the dash is your leak, and one of those accordion looking things on the driver's side (called actuators, I think? not an A/C guy and too tired to search for the name) might have gone bad. That's what is wrong with mine.

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evildky
Posts: 14225
Joined: Sat Jan 31, 2004 9:23 pm
Car: 71 Datsun 240ZT
87 Nissan 300ZX N/A-T
06 Nissan 350Z GT
Toyota Tundra TRD RW
Location: Louisville, KY
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yup, 2 vac lines enter the cab throught the firewall near the battery, they feel a group of valves adn dashpots located on the trans tunner near the drivers feet, often the lines or daishpots simply dry up and break, sometimes the bashpots just stick and need to be freed with a vac pump


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