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R32 Gtr Cabin Heater

LotusGTR

By LotusGTR,
in General Maintenance

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LotusGTR Veteran

LotusGTR

Posted
Posted

Yawn. So much prefer to be asking tech questions to get more power or handling....but anyway. My daily GTR's heater doesn't run hot enough. Cold Melbourne mornings over-run it. Says 32 on the dash display but I'd think the heat is equivalent to 24 at best.

In all other respects the heating cooling ventilation is working as you'd want.

Any ideas on a fix other than replace the 'head unit'?

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https://www.sau.com.au/forums/topic/324009-r32-gtr-cabin-heater/
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tiberis Enthusiast

tiberis

Posted
Posted

not sure if it's the same system as the early 180sx's (mine was 1989 same era as the R32's) but there was a way to get into the diagnostics for the climate control and you can set a bias for the temperature sensor.

the idea would be to make it think it's only 16C when it is actually 20C and therefore it will try to heat more (for example).

somewhere on this forum should be a post on how to get into the diagnostics. also make sure that the temp sensor in the cabin is plugged in and mounted correctly. there should be some small slits somewhere around all the other controls on the dash, thats the intake for the sensor. it should have 1 plug and 1 small (wide as a thumb) tube coming off it.

hopefully that helps.

LotusGTR Veteran

LotusGTR

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close outside vent then turn all way up once it is all the way up push and hold the hot button till "FH" comes on, the same can be done for cooling with "FC" appearing on sceen

OK, I stumbled across FH last week but couldn't do anything with it. When you say 'outside vent' what do you mean? Where is this located and how do I close it. Forgive me if this is just a dash vent as that would be a stupid question eh... eh. Also, what is the effect of doing this please? What does it achieve?

LotusGTR Veteran

LotusGTR

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It's possible the actuator rod isnt completely opening up, do you get cold air in summer or only cool air?

Good question. In summer with the AC on, it doesn't blow as cold as you think it should. The car was fairly recently imported last summer so I'll assume the AC was de-gased / re-gased and therefore this part of the AC function is OK. Perhaps this points to your diagnosis......Fan only cold is hard to judge as everything is too hot in summer and too cold in winter, when set to 18 degrees.

So, let's say it's the actuators, how do you fix these? Where are they? More to the point, to what kind of person do I take it to for fixing as I'm not the type (unfortunately) to get my hands dirty.

Moodles2 Grand Master

Moodles2

Posted
Posted

Since you get cool air in summer, and warm air in winter, I think the servo arm (i call it the actuator rod) is stuck in-between, neither cold or hot. Try the paper trick and see if you can hear the servo motor moving the rod to full hot or full cold position.

LotusGTR Veteran

LotusGTR

Posted
  • Author
Posted
Since you get cool air in summer, and warm air in winter, I think the servo arm (i call it the actuator rod) is stuck in-between, neither cold or hot. Try the paper trick and see if you can hear the servo motor moving the rod to full hot or full cold position.

paper trick?

XKLABA Grand Master

XKLABA

Posted
Posted
OK, I stumbled across FH last week but couldn't do anything with it. When you say 'outside vent' what do you mean? Where is this located and how do I close it. Forgive me if this is just a dash vent as that would be a stupid question eh... eh. Also, what is the effect of doing this please? What does it achieve?

sorry my bad i meant turn it to recycle air not bring it in from outside

XKLABA Grand Master

XKLABA

Posted
Posted
Since you get cool air in summer, and warm air in winter, I think the servo arm (i call it the actuator rod) is stuck in-between, neither cold or hot. Try the paper trick and see if you can hear the servo motor moving the rod to full hot or full cold position.

mine has this problem but if i put my finger on the electrical plug at the bottom of the unit and push up the unit works while my finger is stiil pushing

Moodles2 Grand Master

Moodles2

Posted
Posted

I do the exact same thing, in summer i push that plug up to do to full cold, in winter i do the same to get it to full hot position. Ive got long enough arms to be able to do it while driving, though i prefer doing it at lights

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