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Old 10-29-2008, 11:54 PM   #1
silentt
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Default Heater core doesn't turn on after swap?

Hey guys,
I most likely just missed plugging this in (dash isn't in yet though) but my HVAC system doesn't turn on now that I have swapped. Am I forgetting to plug something in? Which plug would be involved with this? I double checked last night and plugged in the brown plug on the bottom of the black unit (passenger side) and plugged in the white plug on the top of the unit. Am I missing anything else?

99 RS body/interior, mechanically 07 STI.
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Old 10-30-2008, 12:37 AM   #2
sidewayz
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did you plug in the heater controls?
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Old 10-30-2008, 01:42 AM   #3
silentt
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Yeah, sorry.. I guess that leaving out that bit of information would lead everyone to think I'm retarded. Yes, the controls are plugged in.
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Old 10-30-2008, 07:13 AM   #4
Dan Cech
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When you say 'doesn't turn on' do you mean the blower motor doesn't come on? the a/c switch doesn't light up? the cluster backlighting doesn't work?

If it's just the blower motor, check the blower motor relay, blower motor resistor and the fuses.
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Old 10-30-2008, 11:46 AM   #5
silentt
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Quote:
Originally Posted by Dan Cech View Post
When you say 'doesn't turn on' do you mean the blower motor doesn't come on? the a/c switch doesn't light up? the cluster backlighting doesn't work?

If it's just the blower motor, check the blower motor relay, blower motor resistor and the fuses.
Sorry, it's just the blower motor doesn't turn on. I turn on the AC and my rad fans start spinning (don't have my AC system running yet, just needs a tensioner and a belt) and it lights up. Where is the relay and resistor for the blower motor?

There should be no wiring for this in the swap, right? I did the wiring so long ago (trouble-free too! ) that I can't remember what was done.
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Old 10-30-2008, 06:43 PM   #6
Dan Cech
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The blower motor resistor plug should be on the center part of the HVAC unit if I recall correctly, it'll be a 4-pin plug. If the fan comes on when you turn the blower switch to max then you don't have the resistor plugged in.

If it doesn't come on at all then most likely it's the blower motor relay or a fuse.
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Old 10-30-2008, 08:51 PM   #7
elislider
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check your fuses and if necessary start pulling the passenger side dash apart to make sure things are plugged in
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Old 10-30-2008, 11:13 PM   #8
silentt
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Alright, I'll start to hunt down the relay and fuse. Thanks.

Quote:
Originally Posted by elislider View Post
check your fuses and if necessary start pulling the passenger side dash apart to make sure things are plugged in
What/where are the plugs on that? I have 2 or 3 things plugged in to there right now, can't remember off hand.
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Old 11-03-2008, 03:39 AM   #9
silentt
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Problem solved :roll: The relay wasn't plugged in all the way. It tapped it, it clicked into place and the HVAC worked again.
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Old 11-03-2008, 07:27 AM   #10
Dan Cech
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good to hear it was something simple!
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