No heat from heater 1990 ZR1

[WVZR-1]

The 15-71937 is the ACD for the 89018368 that I mentioned. If you decide to buy and try confirm it's returnable if it doesn't work. A friend at a dealer has mentioned problems for some of these newer actuators.

I'd suggest a conversation with a local ACD jobber or a dealer before the buy.

[jrd1990zr1]

Originally Posted by WVZR-1

The 15-71937 is the ACD for the 89018368 that I mentioned. If you decide to buy and try confirm it's returnable if it doesn't work. A friend at a dealer has mentioned problems for some of these newer actuators.

I'd suggest a conversation with a local ACD jobber or a dealer before the buy.

Actually I stopped by the local ACD jobber (United Auto), gave them the GM 16124952 and it crossed to ACD 15-71937. They called TN while I was there and they verified availability. Generally I think all electrical components are not returnable, so that may not be an option. Do you know of a better way to proceed? Do you know what the dealer does when they run into this problem?

Thanks.

[jrd1990zr1]

Originally Posted by -=Jeff=-

Interesting Comments by Bryan,

My friend's 1990 had an issue and I think a programmer from a 95 or 96 worked..

Also I think the control heads were all the same, sans the color changes

Jeff this is the quote from Bryan. Maybe I misunderstood.

"I don't think changing the year programmer is in your interest. The LT-5s use a different signaling method to communicate with the ECU, and they changed over time, so whatever you do, stick with the correct part for your year car."

So the way I understand it the actuator regardless of position on the top or bottom of the heater core box is controlled by the AC programmer. I'd have to switch to a 1994 programmer which might not communicate with my 1990 ECU. Unless I am misunderstanding . So my best route appears to be the stay with the 1990 components, once I find an actuator I am sure works.

Is my logic sound?

Thanks.

[-=Jeff=-]

How much is the part? if not too much might be worth getting

[-=Jeff=-]

Originally Posted by jrd1990zr1

Jeff this is the quote from Bryan. Maybe I misunderstood.

"I don't think changing the year programmer is in your interest. The LT-5s use a different signaling method to communicate with the ECU, and they changed over time, so whatever you do, stick with the correct part for your year car."

So the way I understand it the actuator regardless of position on the top or bottom of the heater core box is controlled by the AC programmer. I'd have to switch to a 1994 programmer which might not communicate with my 1990 ECU. Unless I am misunderstanding . So my best route appears to be the stay with the 1990 components, once I find an actuator I am sure works.

Is my logic sound?

Thanks.

I don't think you have an issue with swapping the Programmer. The ECU communication is different yes, but I don't think that will effect the Programmer. I don't think I have any extras any more, but I know the controller is compatible for all years.. I think you would be fine

[WVZR-1]

Originally Posted by jrd1990zr1

Actually I stopped by the local ACD jobber (United Auto), gave them the GM 16124952 and it crossed to ACD 15-71937. They called TN while I was there and they verified availability. Generally I think all electrical components are not returnable, so that may not be an option. Do you know of a better way to proceed? Do you know what the dealer does when they run into this problem?

Thanks.

Try the actuator you have and if you decide to buy talk to United and explain you've been told there are maybe issues with the part# supercession and ask if it's returnable to them if it doesn't function.

Talk to a local dealer also maybe - buy from whichever understands the issues. Works you keep, doesn't you return - maybe offer to accept merchandise credit if you need to return!

Try to negotiate a price to maybe something $80 or less!

[WVZR-1]

swapping the programmer?

GM SPO has different part # for MY and also engine RPO -

92-93 - LT1

92-93 - LT5

94-95 - LT1

94-95 - LT5

Seems that when they started to supply REMAN they would have consolidated the part #'s. My SPO information was current in year 2000

Consider also that with R134 conversion in '94 there was likely different values expected from components. I've certainly no 1st hand experience but I ain't wanting to try

[jrd1990zr1]

Originally Posted by WVZR-1

Try the actuator you have and if you decide to buy talk to United and explain you've been told there are maybe issues with the part# supercession and ask if it's returnable to them if it doesn't function.

Talk to a local dealer also maybe - buy from whichever understands the issues. Works you keep, doesn't you return - maybe offer to accept merchandise credit if you need to return!

Try to negotiate a price to maybe something $80 or less!

I will try the two I have tomorrow.

Also spoke with my local chevy dealer. GM16124952 is NLA, checked nationwide database NLA. I gave them ACD 15-71937 which they said crosses to GM89018368 (as you said) which is readily available. $138.00 non-returnable.

ACD 15-71937 is available from United for $95.00 and is non returnable.

I will probabily end up buying the ACD one if the two I have do not work.

I don't mind spending the $100 if I can get this working, this is the worst repair I have had to make on a corvette, I am just getting frustrated.

I think swapping the 1990 programmer with a 1994 at this point is a not going to happen.

Sorry for the drama.

[-=Jeff=-]

Yeah I understand. I need to read through the thread again to see what you have already done


Sent from my iPhone using ZR-1 Net Registry

[WVZR-1]

Originally Posted by jrd1990zr1

Also spoke with my local chevy dealer. GM16124952 is NLA, checked nationwide database NLA. I gave them ACD 15-71937 which they said crosses to GM89018368 (as you said) which is readily available. $138.00 non-returnable.

ACD 15-71937 is available from United for $95.00 and is non returnable.

I will probabily end up buying the ACD one if the two I have do not work.
don't mind spending the $100 if I can get this working, this is the worst repair I have had to make

If you can confirm the actuator is needed then the purchase from either will afford you the warranty. If a new purchase doesn't work they would be obligated to supply the second or I suppose with a discussion that you suspected maybe not a valid replacement refund the purchase.

Ultimately I believe the best buy is the "local" and NOT an Internet buy.