I just got my first corvette. 1992 the climate control is not working.i changed the unit but still not working checked the fuses I'm not getting power to the heater fuse any tips thanks roncap

 

Is it a C60 or C68 HVAC system?

And if you think that question is mysterious you should take a close look at your post. It suffers from a great lack of information that would allow us to diagnose your problem. "not working" doesn't tell us anything useful.

 

It's a elec. c68 heater, a/c control for 1992 corvette.what works nothing no blower temp up and down the only thing that comes on is the light in the small window . Is there more than one fuse? Thanks

 

There seems to be several problems going on. The Temp Up/Down is normally caused by the touch pads behind the buttons getting dirty and is a common problem. The fix is to remove the unit and open it up then clean the pads with alcohol and a pencil eraser. You say you changed the unit so that should eliminate that problem. At this point I don't know what else to do unless the replacement unit is used and has the same problem. This button thing is well known and documented on this forum so just search and you should find several "How Too's".

Here is one example: http://forums.corvetteforum.com/c4-g...on-repair.html

 

Check fuses #18 and #43 to see if they are good. (check #1 & #4 also.)

Do any of the green LEDs light up with the key ON and pressing different buttons.

With the key ON, does it display any ambient outside temperature in the display.

When the parking lights are turned ON, does the control head light up also with the other instruments.

 

The two fuses do two things. One powers the HVAC control head all the time to keep the temperature setting and function settings in memory alive. The other fuse powers the control head when the ignition is turned on.

 

It seems like there is more then one thing going wrong. I know I found a broken "T" filter/check valve, I believe on the passenger side, that sends vacuum to the cruise control and the Climate Control Vacuum Module on my 96'. Try your cruise and if you are having problems with both of these then you might want to give this a check.

 

All fuses are good except no power to heater fuse?

 

I don’t understand as to what you mean by the heater fuse. That term is not used so it does not have much meaning to me. May be you can get a fuse number as to which one it is.

But you did not answer any of my questions. I am trying to get a better picture as to what the visual indications are as to what is working and what is not. That information helps me and others off offer more valid help than to just throw around guesses and meaningless suggestions.

 

A fuse has both; power going to it, and leaving it.. by reading your post you indicated that circuit is dead, on the other hand the fuse my have power going to it, but not leaving it do to a blown fuse etc. you need to articulate a bit more..

 

Let me try again just got the car climate control did not work. Went through it cleaned under the buttons put it back together and still not working.so I got a new one plugged it in same result with the key on I only get the light on in window. No temp letters or numbers Went to fuse box with test light checked all the fuses all good except the one marked htd changed that fuse still no power to that one that's where I stand

 

OK.. the next step I would take is, bust out the FSM and determine which pins at the connector are suppose to have both power and ground. This could be as simple as a bad ground.

 

Where do I get the fsm

 

The HTD fuse which is really labeled HTD MIR is fuse #5 which is the power for the heated side mirrors. If you are looking at fuse 5, then this has nothing to do with your problem and it does not supply any power to the control head.

Guess since you are not answering any of my questions, I'm assuming none of the green LEDs are lit.

If the control head is assumed good, and fuse 18 & 43 is good, and a light lights in the temperature window, it would seem like there is power getting to it from the key being turned to on. Check the connector for broken wires or corrosion.

If the control head working, the HVAC programmer basically feeds all data to the control head and displays the data on the head. The programmer could be defective although this sounds like it would be a catastrophic failure. I would check to see if it is even in there. It's lives on the fire wall up to the right of the gas pedal. Just see if any connectors are hanging and not connected to anything. It is a job to get out as it receives electrical inputs and vacuum inputs. It just does not fall out of the car.

I will say that if fuse 43 is bad or if the voltage it supplies is not getting to the points it needs to, or if the programmer is bad, or if it is not even in there, you will get the exact condition that you have with no LEDs lit and the temperature window lit.

I'm sure the root cause of the problem could be something else, however these seem to be the basics that are causing your problem.

 

He is talking about a Field Service Manual (FSM). They are available on Ebay or even Zip Corvette. You want to purchase the Red Covered version. In most cases they come in pairs. One for body and one for engine/trans. They cost around $100.00 but are well worth the price. They were used by GM dealers to trouble shoot "Any" and I mean "Any" problems. It will have step by step instruction on how to find the root cause behind any given malfunction. If you plan on paying a garage to do the work on your car then don't bother. If you plan on doing your own work you must, repeat, MUST get a set of these. You will save the cost of the books the first time you fix something. They are invaluable to maintaining a car as old as this. Unless you take your car to a garage that solely works on vettes then they will most likely throw parts at it till its fixed because they no longer have these manuals to guide them. All of us on this forum will help you if we can but you need to answer all questions so we can narrow our diagnostics. Some times the questions don't seem relevant to you, but can lead us to a better understanding of the problem. These cars are complicated electronically with multiple computers/circuitboards that all communicate with each other. When ask does any of the green led's light it was because these are driven by a circuit outside of the control head. We will help but you need to work with us, otherwise, go pay a garage to swap parts till your wallet is empty.

 

Is the programmer on the firewall inside or under the hood?

 

Its not under the hood.

It is inside the car on the wall and it is hard to see without good light. It is much harder to see also with the knee pad in place but possible. It is right above the gas pedal about 4 or 5 inches and the box is about 5 inches square.

It cannot be removed without removing the knee pad first.

 

Thanks I'm going to ck.

 

If I'm looking at the right part above the gas pedal it's got a black cover over it I can see a green board behind it.all the wires look to be connected .I don't have a owners manual what fuse is 43

 

Bottom row, middle fuse 5 amp.

Another way to say it, third from the left or third from the right.