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Nissan Repair/Heater doesn't work while idle

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Question
I have a 2005 Nissan frontier.  I have a remote starter and when I let the engine run idle thee heater doesn't work.  But when I dive up the highway it works.  When I let off the gas again it doesn't work.  Any idea what causes this?

Answer
Hi William -

The heater is controlled by engine vacuum. The more RPM's the engine has, the more vacuum -

With that said, I would replace the heater control valve, which should be in line with the heater hose near the firewall. It is probably sticking at low vacuum. I would also check the vacuum hoses related to the valve. Could be kinked or broken.

Hope this helps -
aloha
Calvin

Nissan Repair

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Calvin Iwashita

Expertise

All general car repairs for all models of vehicles, except technicals (overhauls) on A/C systems and transmissions.

Experience

16 years as a car mechanic from 1974 to 1990, and still repair cars on the side.

Publications
TV

Education/Credentials
High School and college graduate

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