All Activity

In the 04 Impala it's the Class 2 Serial line, shared with the BCM, PCM, HVAC, everything really! If I knew the protocol I could potentially simulate it using an Arduino, like I'm doing for the ALDL input on my UB3 cluster tachometer. Or I can still just swap the PCM. In either case it looks like the HVAC module and the PCM need to be able to communicate.

Do you know what the AC request signal is though from the BCM? On the Cutlass, the request is in the form of a power or ground signal applied to a specific PCM pin. The PCM will then use a combination of other inputs to determine if and when to allow the compressor clutch to engage. Not having proper input from the powertrain side of things on the Cutlass PCM might not allow it to enable the AC compressor. On a 2004 Impala, that AC request signal from the BCM may very well be in the form of a communication between BCM and PCM rather than a simple power or ground switch. From an operational perspective, the V5 adjusts internally based on refrigerant pressures….so the option to bypass everything and run a separate toggle switch to enable the compressor might be required in the end anyways.

This is a Series II L67.

I'm not familiar with the series 3 L67, I've only dealt the series 2, is there any sort of block casting redesign that will prevent one from fastening the V5 compressor to where the cvc is mounted?

I'm looking at the 04 Impala FSM. The BCM *is* part of the system, but it's only a A/C Request Signal which connects to the HVAC Control module. Since I'm not using the Impala control module, I don't think that matters. I am using the Cutlass module. I also don't see any special circuitry for the CVC function. It's just a normal looking clutch either off or on, no other electronics for the compressor.

Because of the physical mounting, or because of the PCM? I can swap PCM if needed to use a different compressor, but If i'm limited to this 04-08 compressor mounting style, I will almost certainly need to make custom lines since they use a completely different line configuration.

One thing to be careful of there is that 2004 was a bit of a transitional year. A 2004 Lacrosse is a 3rd gen W and came with the 3800 series 3, while the 2004 Monte/Impala was still a 2nd gen and came with the 3800 series 2. Compatibility wise, you’re very much going to be stuck running a compressor compatible with a 2004 Monte SS if you want any hope of things functioning properly. The other potential gotcha is that 2nd gens also ran a BCM. There is a possibility that the PCM requires input from the BCM in order for the AC compressor to run correctly in the first place.

Yes, there is currently the original 04 Impala compressor installed, but I will need to replace it. It's been disconnected from the lines for years since the initial swap and the inlet and outlet have not been plugged, who knows what kind of gunk has gotten in it. So I am replacing *everything* except (if I can avoid it) the evaporator.

I see, but the powertrain you have in the car is from the same 04 Impala?......so the a/c compressor mounted to that block would be the cvc unit....and that's what currently still mounted to the engine?.....if you've removed the compressor what are you using for a pulley to take the place of the compressor?

A CVC compressor used in 04-08 and 09 LaCrosse 3.8L is a completely different mounting design from *all* the others posted above. I bet none of the others would even fit. And looks to have very different fittings on the back... This is an 04 Impala SS diagram:

I had a ton of PCM issues in the beginning, so I had to go back and double-check what I ended up using. I confirmed it is a 04 Impala SS PCM, same as the engine and trans, but it's from a different donor purchased separately.

Ok, that's a start, that PCM is programmed to control a CVC compressor, (compact variable compressor), did you pull the supercharged powertrain from the same 2004 Impala vehicle including that compressor?

OBD2 out of an 04 Impala SS.

Putting all of the *hardware compatibility* aside for a moment.... what ECM/PCM are you using to drive that L67? Are you using the 1227727 case or the 1614936 case?.........with a burned chip tune for an eeprom These are OBD1.. or are you using an OBD2 pcm?

I'm not sure I'm 100% following your suggestions. It also conflicts with one of the *very* old L67 swap guides from motorswap.org, which says you need 3.4 DOHC (assuming LQ1?) lines. If *that* is true, then I already have all the correct lines because they are shared with the LH0 in the '92 Cutlass. I'm posting photos and what I've found so I can try to decipher the specific differences between at least these three models. 92 Cutlass, 3.1 LH0 and 3.4 LQ1: 92 Regal, 3.8 L27: 98 Lumina LTZ, 3.8 L36: All of these share the same evaporator, so that's not an issue. There are two condensors, they have slightly different dimensions (and may or may not physically fit if interchanged), and while the inlet and outlets apparently have the same fittings, they are positioned slightly different. 52452050 (89-93 and 94 Lumina): 52481282 (94-01): There are several different driers. Looks like all w-body up to 93, plus 94 Lumina all have the same one with threaded connectors, one male and one female. There's another from 94-97 that *looks* the same with one male and one female threaded, and a service port added. Possibly interchangable. The one in the 98 Lumina is unique to only the 98-01 Lumina and Monte, with one threaded and one o-ring compression fitting. These are obviously not interchangable without also changing both lines. 2724686 (87-93 and 94 Lumina): 2724929 (94-97): 01132767 (98-01 Lumina and Monte): The compressors probably have many versions, but just looking at these three cars we have: 89018893 in 89-93 and 94 Lumina, all without 3.8L. 89019355/1522130 in 89-94 with 3.8L. 89018897/1521662 in 96-04 with 3.8. Supercharged 3.8L 95's (and 94 S/C Regals) got their own compressor, 19169371/1520434. Between these there are at least three different fitting types: HD6, HR6, and V5. The aftermarket for these is all mixed up, showing multiple types available for the same car, so I don't know which is which! For comparison, here's the back of a V5: And an HR6 (suction and discharged are swapped but otherwise looks the same aside from being polished and the rotation which may be the part itself and/or just the photo position): Another labeled HR6 that looks completely different from the previous: And I couldn't find a clear picture of an HD6, it might just be a mislabeled HR6. Now for the lines... From the drier to the evaporator. 10223050 in 88-93 and 94 Lumina. 19244605 in 94-97 (also listed for 95-97 Lumina and Monte even though there's a separate part number for those). 10445945/1531213 in 95-01 Lumina and Monte. From the evaporator to the condenser. 10220973 in 89-93 and 94 Lumina. 1533130/10190636 in 94-97. 10407722 in 98-01 Lumina and Monte. From the compressor to condenser and drier. 14099685 in 92-94. 52362087/1530113 in 92-93 Regal 3.8L. 10226168/1530241 in 94-95 Regal 3.8L. 10407721 in 98-99 Regal and Lumina 3.8. Now... Have I gotten myself any closer to picking which components and lines I need?! I don't think so! I assume I will need a compressor out of another 3.8, maybe specifically a Series II 3.8, just to get it mounted to the engine?

Point is, if the heater core is plugged with rust/scale/slime/garfelderfarb, the inlet should be hot, and the outlet cold. You're saying it's the other way around.

I wouldn't think so since I get heat sometimes. But, I did re-do the intake manifolds and went back to stock on the heater lines. I had ghetto tapped into the coolant lines for a turbo that I took out and went back to one without water cooling. I don't think I messed anything up, but it's definitely possible.

Question, or statement? Are you sure you have the correct flow-path through the heater core? You haven't reversed the inlet vs. outlet...right?

The new speakers KICK BUTT. Infinity Primus. No looking back. As it turns out, 5 years ago I installed the Retrosound R-69Ns. One is still good but the other one blew out. I figured out which two wires were needed, don't use the blue and blue/white stripe wire set, they are not needed. Next up: replace the factory door speakers with the NOS ones I have in storage. All I have to do is find them...........

I went thru some of this non-compatible B.S some 11 years ago when I updated my A/C system to 134. I had already purchased a newer 134a compressor to replace the original R12 compressor that was leaking, at THAT time I didn't realize that the manifold hose assembly ends (fittings) had been redesigned for the 134a systems. Seeing as I HAD to purchase the 134a manifold assembly for the redesigned compressor... I did NOT want to replace all of the other hardware, the new manifold would NOT fasten to the older receiver/dryer because the threads were altered........ all of this fell into play as I had also updated the brake vacuum booster, the larger booster required a *newer* 134a liquid side A/C delivery pipe. The newer pipe was redesigned to go under & around the larger dia booster & would NOT fasten to the older design receiver/dryer, the fitting threads were not the same. I had to cut off the ends of the newer pipes & cut off the ends of the original & swap the old fittings to the new pipes & tig them into place. Hopefully you can avoid all of the B.S if you keep everything compatible. The 96 V5 compressor is near identical to the older V5 with respect to its *clocking*, what IS different (besides the rear housing casting) is the mounting points openings...where the older item has threads cut into the flanges the newer design sees thru openings with no threads cut.

When it comes to evaporators, the real test would be checking the part number for a 92 Regal with the 3800 against one for a 92 cutlass. If the part numbers match, you should be OK there. 88-95 Regals with the 2.8/3.1/3100 would have had the same AC setup as the other Ws of the same year. The 3800 series 1 cars, of which the 90-95 Regals were the only Ws to use it, used a completely different AC compressor and AC setup(Cycling clutch vs variable displacement compressor) Some parts might match and interchange with other Ws, while others won’t. Just something to keep in mind when cross shopping parts. AC parts for a 92 Regal with the 3.1 should all match a 92 cutlass, where as parts for a 92 Regal with the 3800 may not all be the same.

Reviewing some components other than lines... I just checked the part numbers (3093285) for the evaporator core, and they're the same part from '88-'01 in just about every W-body, including 92 Regal, 92 Cutlass, 98 Monte. So at least the fittings there should bolt up no problem from any donor. The condensors are the same part number (52452050) from 89-93 and 94 Lumina (did it still get R12 that year?), and a second part number (52481282) for the rest of 94-01. Aftermarket lists them both as having 3/4" - 16 thread inlet and outlets, good for R12 and R134, but different core thickness (18mm and 25mm), and slightly different core dimensions and styles. Other than that they seem to be the same, possibly interchangable. I already do have a brand new 89-93 condensor I bought several years ago and never installed.

One issue you may run into there is that 3800 series 1 powered cars all used the HR6 style AC compressor vs the V5 compressor that the 60 degree V6s and the 3800 series 2 cars used. A 1996 Buick Regal 3800 would have had a 3800 series 2 from the factory, so you might need to look for the AC components for one of those.

The coolant was a little low, but didn't take much to top off the radiator. The overflow was almost completely empty, though. I did not run it again to see if that helped, so I'll do that later today, but I doubt it will help.

I'm going to differ with you on this Kyle....... what OP needs is the necessary A/C piping from a 1st Gen Regal with the 3.8 engine. If you intend on keeping as much as your car is currently fitted with you'll need the a/c compressor manifold hose assembly that was fitted to the 3.8 Regal & a new rebuilt pre 94 compressor. Everything prior to 94 is R12 based, everything post 93 is R134 based. When GM introduced 134 in 94 they changed ALL of the A/C line fittings thread pitch so NOTHING from prior & post can be used together. My suggestion to you is to keep your 92 car all 92, get that old 92 3.8 manifold hose assembly & purchase a new *rebuilt* pre 94 A/C compressor, even the manifold hose assembly changed in 94 because GM redesigned the back end of the compressor housing for 94 so the old manifold hose will not attach to the newer design compressor housing. Purchase yourself a new receiver/dryer as well as a new orifice tube. Go into Rockauto, search 92 Regal, they still house most of what you'll need.