03 Tahoe no rear heat

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October 18th, 2009, 11:25 AM

#21

maxbaby

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I spoke with that former tech friend yesterday. He was pretty certain that there would be no issues at all with plugging in the black box, and that the code, if generated, would go away after several startups of the vehicle. So I went ahead and did it. At first my new actuator didn't respond. So I shut the vehicle off and restarted it, let it run for a couple of minutes and then shut it off and restarted again. And for the last two days, all seems to be working just fine. The actuator is doing what it's supposed to be doing. I guess we'll see what happens but all good so far.

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October 18th, 2009, 8:49 PM

#22

ciscore

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By "black box" do you mean the control module?

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October 18th, 2009, 10:18 PM

#23

maxbaby

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Control module... computer module... whatever it's called. When you open up the rear panel covering the auxiliary heating system, you'll see the two actuators and the computer module in between with two plugs plugged into it. Don't forget to use the new part number and not the part number from the old one so that you get the updated unit.

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October 18th, 2009, 11:35 PM

#24

ciscore

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Quote:

Originally Posted by maxbaby

I was just making sure I was following you right. So which part number is the new one? Thanks!

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October 19th, 2009, 11:34 AM

#25

maxbaby

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It's all in that technical bulletin. Have a look, part number listed there is what I orderd.

(Nice find for the part on Amazon. I didn't know they did those types of parts, much cheaper).

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October 19th, 2009, 11:39 AM

#26

ciscore

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Quote:

Originally Posted by maxbaby

It's all in that technical bulletin. Have a look, part number listed there is what I orderd.

(Nice find for the part on Amazon. I didn't know they did those types of parts, much cheaper).

I was just confused from the TSB on which part number was which. I ordered <meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 12"><meta name="Originator" content="Microsoft Word 12"><link rel="File-List" href="file:///C:%5CUsers%5Cjon%5CAppData%5CLocal%5CTemp%5Cmsohtm lclip1%5C01%5Cclip_filelist.xml"><link rel="themeData" href="file:///C:%5CUsers%5Cjon%5CAppData%5CLocal%5CTemp%5Cmsohtm lclip1%5C01%5Cclip_themedata.thmx"><link rel="colorSchemeMapping" href="file:///C:%5CUsers%5Cjon%5CAppData%5CLocal%5CTemp%5Cmsohtm lclip1%5C01%5Cclip_colorschememapping.xml"><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w

oNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w

ontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w

ontVertAlignCellWithSp/> <w

ontBreakConstrainedForcedTables/> <w

ontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <w

oNotOptimizeForBrowser/> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--><style>  </style>ACDelco 15-7350. I'm hoping it'll work! I really appreciate the info on this.

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November 3rd, 2009, 11:05 AM

#27

ciscore

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Well I tried both a new control module and new actuator with no luck. The weird thing is with the new actuator in and the old control module, the actuator moves to the cold side and stays there. With the new control module and either actuator, it moves to the hot site and stays there....WTF? I'm close to just taking it in to the dealer. Ugh.

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November 3rd, 2009, 12:14 PM

#28

maxbaby

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You're sure you got the updated control module, right? And you've played with the overhead controls as well as the rear controls to make it work? One more thing, you've had the truck running and then shut off at least three times since installing it? Other than that, I don't know. I'd be very interested in hearing what the dealership says.

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November 3rd, 2009, 1:00 PM

#29

ciscore

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Yup, I've done all of that, except I'd have to double check to make sure the control module I've got is the updated one.

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November 3rd, 2009, 1:20 PM

#30

ciscore

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I did find this info which I will try tonight.

1. Place the ignition switch to the OFF position.
2. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
3. Install the HVAC/ECAS fuse.
4. Start the vehicle.
5. Wait 40 seconds for the HVAC control module to self-calibrate.

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