Heater

[300 z man]

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?

[Perrenial Badass]

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.

[evildky]

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