ANY NISSAN TECHS OUT THERE?

[coz]

i have a 98 frontier, heater blower doesn't work on high speed. getting conflicting repair scenarios on frontier forums. thanks for any helpopcorn:

 

[arntufun]

Holly's Jeep has the same issue. The high (#4) doesn't work, but the rest does. :dontknow::dontknow:

 

[tompen]

They are both likely to have a "high blower relay" with a seperate fuse. The fuse could be in line and not in the fuse block. Usually found near the blower motor. Good Luck

 

[JCSMOKE]

A bit of tape over the number 4 worked for me in the past.

 

[boborgera]

A bit of tape over the number 4 worked for me in the past.

Now the question is what color tape.:dontknow:
:roflblack:

 

[coz]

thanks tom

thanks for the help:thumbup:

 

[IGETAROUND]

If I'm not mistaken blower speed is controlled by introducing different levels of resistors. Speed 4 or high would be with NO resistors. Those of your with more electrical knowledge than I feel free to jump right in there pps:

 

[wyliec]

If I'm not mistaken blower speed is controlled by introducing different levels of resistors. Speed 4 or high would be with NO resistors. Those of your with more electrical knowledge than I feel free to jump right in there pps:

I'm thinking along those lines; but, more of a rheostat (variable resistance).

 

[retread]

Most of the auto HVAC I've worked on is set up with the idea that the highest speed would not be used for an extended period of time, usually less than 20 minutes, and there is a separate fuse and sometimes a relay in that circuit that is designed to fail at around that time. It's more to protect the fan motor than anything else.

john

 

[wyliec]

Most of the auto HVAC I've worked on is set up with the idea that the highest speed would not be used for an extended period of time, usually less than 20 minutes, and there is a separate fuse and sometimes a relay in that circuit that is designed to fail at around that time. It's more to protect the fan motor than anything else.

john

If that's the way it was designed, then, that's a pretty bad system design. I've worked in the HVAC field for many years and any multi-speed motor should be able to operate at any speed with no time constraint at design conditions. However, I did not work in the auto HVAC industry. It just seems kind of strange that the motor would be designed that way, especially if there is nothing in the operating manual that states not to run the motor at high speed continuously.

 

[arntufun]

Most of the auto HVAC I've worked on is set up with the idea that the highest speed would not be used for an extended period of time, usually less than 20 minutes, and there is a separate fuse and sometimes a relay in that circuit that is designed to fail at around that time. It's more to protect the fan motor than anything else.

john

Here in NY in the dead of winter, Holly's car runs for 15 minutes even before she gets in it. nojoke