88-94 to 95-98 All Swap Info Compile

[chevysnbuicks]

Originally Posted by NDBoost

Question #2
If i end up swapping a 95+ dash into my tahoe would i need to swap all ac components, heater core and all of that in as well or do i just need to swap in the a/c controls and the dash/cluster and use the 93 heater core, blower motor and will the 95+ ducting line up with the 93 box for the heater motor and all of that stuff?

From what I understand, I basically have the same question. Unfortunately, there are only a handful of people that have actually done the AC control swap, and for some reason they don't check this thread at all. (I've been after this information since November '06) It's possible, but you'll only have three speeds on the newer style AC controls, due to the difference in the HVAC unit itself.

From what I've figured, to have everything fully functional, and honestly to make it easier on yourself, switching out the whole HVAC unit would be the way to go.

Also, I don't think the 95-00 style cluster will fit at all. The newer style curves down, and the older style curves up. If you want the newer style, you'll have to swap everything.

[MStefak]

Well since nobody has actually brought this up ... Im not even sure if ya'll have even looked into WHY the 95-98 heat controls are such a pain, but here goes.

The reason its such a pain is because 95 - 98 heat controls use a potentimeter , not chips as does the 88-94. This means that the door motors are different ... easier actually.

If one were to accuire all the motors and wiring pigtails for the 95-98 motors ... he/she could have knew style controls within a few hours of pulling the dash out .. lower heater box out and replacing all motors then wiring DIRECTLY to the controls.

The 95-98 controls work by sending power to the controls the as you turn the knob it always power to move the motor one way or the way and keep it there by regulating voltage. So think of them as "voltage regulators".

So just incase nobody unstands that haha heres a quick example.

Lets say the voltage going to the motor is 0 when the heat control panel says "Put heat on feet", when you change it to "Defrost" it sends a full 12 volts the motor then moves and damn it if you dont have defrost. They arn't any relays in this system, and the only way to get it to work without the actualy motors would be to relay and resist all the motors like how your blower motor speeds work - what a waste of time haha.

Sorry for the poor punctuation and grammer, just tired.

[MStefak]

Originally Posted by chevysnbuicks

From what I understand, I basically have the same question. Unfortunately, there are only a handful of people that have actually done the AC control swap, and for some reason they don't check this thread at all. (I've been after this information since November '06) It's possible, but you'll only have three speeds on the newer style AC controls, due to the difference in the HVAC unit itself.

From what I've figured, to have everything fully functional, and honestly to make it easier on yourself, switching out the whole HVAC unit would be the way to go.

Also, I don't think the 95-00 style cluster will fit at all. The newer style curves down, and the older style curves up. If you want the newer style, you'll have to swap everything.

The reason you wont have ALL the speeds is because of the blower motor resistor. The older style one only have three speeds (with the exception of the trucks that didnt come with A/c .. they for some reason have an extra speed !! as well as the tahoe and blazer 92-94).

Nothin to do with the HVAC, ive actually seen one with 5 speeds if i remember correctly ...

[MStefak]

Originally Posted by NDBoost

Did a bit of searching. Looking to swap a 97-98 cluster into my 93 blazer. I know the wiring wont line up, but will the connectors work and will the cluster fit in there without much modification? I dont really want to swap my entire dash.

Question #2
If i end up swapping a 95+ dash into my tahoe would i need to swap all ac components, heater core and all of that in as well or do i just need to swap in the a/c controls and the dash/cluster and use the 93 heater core, blower motor and will the 95+ ducting line up with the 93 box for the heater motor and all of that stuff?

No the cluster does not fit. The complete dash swap .. less steering column and PROPER heat controls takes all of 2 hrs if you know what your doing. I did my actual dash sway in 30 mins and the wiring for the cluster in maybe 45 mins. ( I did the dash first and drove around with the old cluster stuffed in there, looked like ****, until a week later i did the cluster swap .. which didnt take long at all like i said. Then again ..
I did my door panel wiring in an hour .. both sides...

[NorCal_z71]

Originally Posted by MStefak

Well since nobody has actually brought this up ... Im not even sure if ya'll have even looked into WHY the 95-98 heat controls are such a pain, but here goes.

The reason its such a pain is because 95 - 98 heat controls use a potentimeter , not chips as does the 88-94. This means that the door motors are different ... easier actually.

If one were to accuire all the motors and wiring pigtails for the 95-98 motors ... he/she could have knew style controls within a few hours of pulling the dash out .. lower heater box out and replacing all motors then wiring DIRECTLY to the controls.

The 95-98 controls work by sending power to the controls the as you turn the knob it always power to move the motor one way or the way and keep it there by regulating voltage. So think of them as "voltage regulators".

So just incase nobody unstands that haha heres a quick example.

Lets say the voltage going to the motor is 0 when the heat control panel says "Put heat on feet", when you change it to "Defrost" it sends a full 12 volts the motor then moves and damn it if you dont have defrost. They arn't any relays in this system, and the only way to get it to work without the actualy motors would be to relay and resist all the motors like how your blower motor speeds work - what a waste of time haha.

Sorry for the poor punctuation and grammer, just tired.

i was unaware that this was the specific reason for the difficulty, but that is regardless exactly how i intended to solve the problem once i get to the swap. I was planning on trying to source as many of the A/C parts as possible and trace them back down the wires to see what parts i was going to need to swap it straight over, as the old style controls are just plain ugly and regardless of where you might put them, they just dont look good, in any way shape or form. glad to get a little run down though thanks for that addition to this thread :shake:

[AK1500]

I am gettin a newer 95 dash tommorow and I really want to knoe how to do the ac/heater wiring..hahaha

[AK1500]

got my dash cluster and all the wiring out of a 95 silverado.

[MStefak]

Originally Posted by NorCal_z71

thanks for that addition to this thread :shake:

This IS my thread ;) lmao

[AK1500]

ok before I start wiring the cluster up, how do I program the drac?

[chevysnbuicks]

http://www.fullsizechevy.com/forums/...es-w-tach.html

Page 14, post 279.

To program, page 13, post 258.

Hope that helped.

[96GreenPhantom]

I read this entire post, and still have not come to much of a conclusion as to the steering column wiring. I have the pinout for the 95-98, but i was wondering if anyone has it for the 88-94 I didn't see it. Or has anyone actually figured out a work crossover? I am actually looking to do this swap backs (putting a 96 harness into a 64 hopefully) and would like to try to put the 88-94 column into it if fitting allows.

Just wanted to throw in my two cents also, and that was I just read all 14 pages of this and most of it was posts asking questions that have already been answered. Kinda new here so I don't wanna piss anyone off, but if you don't have the time to read a few pages of posts, are you really going to have the time to actually do this swap?

[stopspazinout]

im not doing a dash change over but with all the wiring changes here maybe someone can help me here. i have a 89 chevy and i picked up power windows and locks from a 94 and want to put them in. mind you it has manual windows and locks now. just wondering where can i find hot at all times and hot in run power source?

[AK1500]

ok I have read all 14 pages a few times now and I am still unable to figure out which wires run to the drac and which running to the harness from the cluster? Has anyone really done this swap because it seems to me that even the headlight switch swap is incorrect, I connected all the wires as stated on page one and my parking lights don't function.

-thanks

[AK1500]

guess theres not much info out there on this....or its just a great big secret!

[p510]

I have a 97 GMC 3500.
Would a 99 onwards steering wheel fit the 89-98 series truck.

[Mjilnor]

This is a good question as there have been some 99+style steering wheels seen in 98 trucks from the factory. The assumption is that it would bolt on, however there's no guarantee that the air bag has the same plugs.

If you try it, definitely let us know how it works out.

[MStefak]

The wheels are the same from like 97/98 - 02.

[NorCal_z71]

so i have a lead on a 96 harness that still has everything attached as far as i know. what exactly should i ask for AC component wise to make the swap as easy as possible from a AC standpoint? is it one complete wiring harness beneath the dash that then plugs into the additional harnesses and into the dash cluster, radio, etc etc? i am going to try to get the parts from the 96 AC system that are "controlled" but the dash controls so i can swap those with my 94 parts and avoid dealing with the complicated mess of re-wiring the 95-98 controls to operate a 94 AC system.

[SpcyBeanBurrito]

I've been looking for this Info. I hate those Sweep gauges. Thanks
Al

[AK1500]

OK I am working on the whole dash conversion on my 1990 Chevy Silverado, I got the 95 dash gauges and drac but I do not understand how to wire in the drac module to work with the gauges?! Can someone please explain in detail!!!

-thanks