HVAC Problem

[JoshBarber]

Blazee-

The schematic you gave me for the "Air Temp Valve Sensor" shows to only have three wires running to it. Brown, Light Blue, and Black.

Mine, has 5 wires in the connector.

BROWN, BLUE, YELLOW, LIGHT BLUE, LIGHT BLUE w/ Black


Are you sure I have the right schematic for a vehicle with AUTO temp.? Also, this shows 3 left dash fuses. I have the HVAC fuse which is 10amps filled. The HVAC1 fuse, which is 20amps, has never been in since I owned the vehicle, and a ILLUM Fuse which is 10amps. is filled.
I can't register ANY changes coming through the connector (which would lead one to believe its the pot on the thermostat knob...BUT I CAN'T BE SURE, BECAUSE I DONT KNOW IF I HAVE THE RIGHT WIRES HOOKED UP. CANT EVEN FIND A BLACK/GROUND WIRE.

Could you get back to me and let me know if you have the correct schematic?

thanx again
J

[blazee]

The schematic I posted was for a normal HVAC system. Unfortunately I don't have one for the auto AC system.

[JoshBarber]

Originally Posted by blazee

The schematic I posted was for a normal HVAC system. Unfortunately I don't have one for the auto AC system.

F8CK!!!!!!!!
anyway I can get that schematic? SHIT SHIT SHIT!
I actually tried EVERY wire though with the other connected to ground, and saw NO CHANGE throughout the temp wheel adjustments.

UGH!

[blazee]

I don't know much about the auto units, so without some schematics or a flow chart I don't think I'm gonna be much help. Maybe one of the guys with an alldata subscription can get the schematics for us.

[JoshBarber]

Originally Posted by blazee

I don't know much about the auto units, so without some schematics or a flow chart I don't think I'm gonna be much help. Maybe one of the guys with an alldata subscription can get the schematics for us.

do you know anyone in particular I could beg for this diagram?

[blazee]

I think that we have a few members that have alldata subscriptions.

MT-2500 seems to have access to a lot of schematics, too.

[nickledimed]

Originally Posted by JoshBarber

I've located what I believe to be the problem in this image.
Above the heater box on the passenger side, theres what appears to be a relay of some sort, with an electrical connector running into it. Here as you can see I removed the connector, and it killed the noise. With this connector out, the blower still blows, but you get NO HEAT.
Can someone tell me exactly what this part is and what it does? I'd think I would replace it to fix the problem, but Im afraid maybe its just what CONTROLS the thing thats making the noise. Like maybe it controls a door, and the door gets stuck? Or it could be just making the noise itself..

ANYONE?

This is the mixture control moter I was talking about and it is very tight in there...I dismantled my dash to replace it.

[nickledimed]

Originally Posted by JoshBarber

"Blend Door Motor" That sounds about right.
Do you think its the motor? Or the door itself getting stuck?
You ever replaced it?? It looks near impossible!
Do you have a part number for it?

if its a 98 or newer I have th part numbers...if you still need them

[nickledimed]

just anouther quick note....when you dismantle the dash you will have to drop the steering clomn, its not as bad as it seems the dash just rolls back after you take out 3 screws on each side..I think they are 10mm or 12mm not sure which. it is very time consuming though, now when you get the mixture control moter off you can chack the blend dorr to see if it move freely...DO NOT USE PLIERS ON THIS. you should be able to move it reely just by turning it with you hand. If it is stuck you will have to disassemble the blend box, but this is very rare. now if you have read the second post in this thread you should have a very good idea whats going on here....best of luck and if you have any questions post here or pm me....

[nickledimed]

Originally Posted by JoshBarber

How do you access the Octopus of Vac. lines you're talking about?

remove the center consol, then remove the knee bolsters it is right under the a/c control switches.

[unit1]

i have this exact same problem with ac going hot cold hot cold. did anyone ever figure out what the exact problem was. please help.

[Hunter1]

Is there a way to move the door manually without removing the dash? I would like to try this before I spend the $200 or so on the part and about 6 hours of labor.

[unit1]

it is the ac temp actuator that is on top of the ac box behind glove box. it retail for almost 200 at dealer but i got one dealer to sell me one for 130 something plus tax. took me about 1 1/2 hours to put in. didnt remove nothing but glove box and a few trim panels. also removed vacum switch infront of temp cactuator to make more room for my hands. also cut a small piece of the rubber firewall insalation out to make room to turn rachet and remove temp actuator switch . just duct taped rubber back iin place when done. afterdone replaced battery cable that i had removed before starting and car was fixed.