NO HEAT PLEASE HELP!!!

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jmorasch
Posts: 162
Joined: Sat Jul 14, 2007 12:39 pm
Car: 91 Q45 x2

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I have a 91 Q45 and the heat is acting strangely. Since it has gotten cold out my heat doesnt seem to work. Since I have small kids I let my car run for almost 5 mins before we get in but its to no avail because when we get in we can still see our breaths. Today I ran some errands and almost 15 mins into driving the air coming out was still cold. Plese help me figure out whats wrong. Thanks.

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Haitian_King
Posts: 2868
Joined: Sat Jan 13, 2007 8:20 pm
Car: 1992 Black Infiniti Q45 /w TCS
1995 Black Infiniti Q45
Location: South NJ/PA/Canada

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Mix door maybe?

Your HVAC is working?
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jmorasch
Posts: 162
Joined: Sat Jul 14, 2007 12:39 pm
Car: 91 Q45 x2

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ok let me clarify something. This is my husbands user name he has a Q and I have a Q and hes regularly on here, Im his wife so I dont understand the different terms. Whats HVAC?
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Haitian_King
Posts: 2868
Joined: Sat Jan 13, 2007 8:20 pm
Car: 1992 Black Infiniti Q45 /w TCS
1995 Black Infiniti Q45
Location: South NJ/PA/Canada

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Sorry. HVAC = Heating Vent/Air Conditioner(?) unit. basically, your heater controls.

The display was blank on my old one, so I never knew what temperature I was at. (Thank God it was summer time and not winter, otherwise I'd have frozen my nips off.)

Now. Given my limited knowledge of Q45 technology, I'm leaning towards the mix door (located behind the dash) being stuck in position and not allowing the hot air to reach the cabin.

It might be totally something different. But if my diagnosis is correct, I'll be really proud!

There was a post about it somewhere along with a write-up with pictures of how to fix the problem.
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Q45tech
Moderator
Posts: 14365
Joined: Tue Apr 30, 2002 3:19 am
Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl

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Does the coolant temp gauge rise to the midpoint 3 o'clock position?
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jmorasch
Posts: 162
Joined: Sat Jul 14, 2007 12:39 pm
Car: 91 Q45 x2

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every now and then my display doesnt show up but the other day when I was driving almost 15 mins and cold air was still blowing out everything was lit up. So how do you go about fixing this thing behind the dash or getting it unstuck?
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jmorasch
Posts: 162
Joined: Sat Jul 14, 2007 12:39 pm
Car: 91 Q45 x2

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yes the coolant temp gauge does rise to the 3 o clock position.
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AlabamaDan
Posts: 1748
Joined: Fri Aug 02, 2002 12:37 pm
Car: 2015 Infiniti Q70
1998 Infiniti QX4

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Could it be the display Q Gurus?
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96Qowner
Posts: 2720
Joined: Tue Sep 07, 2004 12:11 pm
Car: 1996 Q45

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Haitian_King wrote:Now. Given my limited knowledge of Q45 technology, I'm leaning towards the mix door (located behind the dash) being stuck in position and not allowing the hot air to reach the cabin.

It might be totally something different. But if my diagnosis is correct, I'll be really proud!
Give Haitian_King his no-longer-a-noob trophy!

Yep, sounds like a broken mix door. Here's a thread on the subject. Be sure to follow the links maxnix provided, too.

HELP, No Heat in my Q!
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maxnix
Posts: 22628
Joined: Mon Jul 22, 2002 8:11 pm
Car: 1995 Infiniti Q45
1995 Infiniti Q45t
2000 Infiniti Q45

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Broken HVAC air mix door is best bet.
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Q45tech
Moderator
Posts: 14365
Joined: Tue Apr 30, 2002 3:19 am
Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl

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Broken mix door hinges are 50 x more common on plastic 94-96 than on 90-93 which use a metal rod inside the hinge post.
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96Qowner
Posts: 2720
Joined: Tue Sep 07, 2004 12:11 pm
Car: 1996 Q45

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Also found this thread:

my heat dosent work some one plz help

cwmoss came up with a cheapo "fix".
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Haitian_King
Posts: 2868
Joined: Sat Jan 13, 2007 8:20 pm
Car: 1992 Black Infiniti Q45 /w TCS
1995 Black Infiniti Q45
Location: South NJ/PA/Canada

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maxnix wrote:Broken HVAC air mix door is best bet.
*Happiest Day Of My Life!*
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goody90q45
Posts: 3679
Joined: Wed Aug 17, 2005 2:07 pm
Car: 1992 Q45 (sold)
Location: Orangevale, CA

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Reji = +1. The rest of the pack = 0
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jmorasch
Posts: 162
Joined: Sat Jul 14, 2007 12:39 pm
Car: 91 Q45 x2

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Thanks everyone for the help I appreciate it and I will be sure to follow-up on what was wrong hopefully it is the mix door thing and its an easy fix.
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Haitian_King
Posts: 2868
Joined: Sat Jan 13, 2007 8:20 pm
Car: 1992 Black Infiniti Q45 /w TCS
1995 Black Infiniti Q45
Location: South NJ/PA/Canada

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I hope it works out for you. It's getting colder.
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Haitian_King
Posts: 2868
Joined: Sat Jan 13, 2007 8:20 pm
Car: 1992 Black Infiniti Q45 /w TCS
1995 Black Infiniti Q45
Location: South NJ/PA/Canada

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Did you manage to identify the problem? How'd it go?
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