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Bought my C4 yesterday

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Old 01-22-2017, 12:16 PM
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belairbrian
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Default Bought my C4 yesterday

But can't pick it up till next weekend.

After looking and more than a few I finally found one I was willing to hand over money for.

92 Coupe, great paint, great interior, new tires.

Has 4 issues that I will have to address. From what I've read all are fairly common issues.

1) you can flash the high beams but not keep them on.
Switch adjustment? Maybe the switch

2) Right turn will only lock in with quite a bit of force, left normal.
Thinking something in the cancel cam/springs but will have to take apart and see.

3) Console pad is separating from the door at the edges. Pad in good shape, looks like adhesive failure.

4) The biggie. No heat, All control buttons work properly, so I'm thinking blend door motor or blocked heater core.
Old 01-22-2017, 02:01 PM
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Gibbles
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For the turn signal/brights, do you have a bunch of play in the steering wheel?
​​​​​​​like lift the wheel up and down sorta slop.
Old 01-22-2017, 02:53 PM
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markKlein
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When it is warmed up what does the digital gauge say the water temp is?
Old 01-22-2017, 10:31 PM
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belairbrian
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Originally Posted by Gibbles
For the turn signal/brights, do you have a bunch of play in the steering wheel?
​​​​​​​like lift the wheel up and down sorta slop.
Didn't notice any when driving it. but I'll check with it sitting still once I pick it up.
Old 01-22-2017, 10:33 PM
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belairbrian
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Originally Posted by markKlein
When it is warmed up what does the digital gauge say the water temp is?
Not sure what you mean by digital gauge?

The water gauge is at mid deflection. I also let it run sitting still until the fan cycled on and off to check that it worked.

The requested temp on the HVAC panel was run all the way to 90 with no effect.

Last edited by belairbrian; 01-22-2017 at 10:34 PM.
Old 01-23-2017, 10:24 AM
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markKlein
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Originally Posted by belairbrian
Not sure what you mean by digital gauge?

The water gauge is at mid deflection. I also let it run sitting still until the fan cycled on and off to check that it worked.

The requested temp on the HVAC panel was run all the way to 90 with no effect.
Sorry, the 94 had a digital coolant temp display; I assumed the 92 did also. Might be worth borrowing a temp reader and seeing what it is going through the hoses, but I think blend door is the best guess.
Old 01-23-2017, 11:09 AM
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markKlein
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Originally Posted by belairbrian
Not sure what you mean by digital gauge?

The water gauge is at mid deflection. I also let it run sitting still until the fan cycled on and off to check that it worked.

The requested temp on the HVAC panel was run all the way to 90 with no effect.
Looking on eBay I see the 92 does have a GAUGES button? What happens when you press that? Later years have both the analog gauge and the digital display, and the digital is normally much more accurate (also, the analog gauge is not proportional, so if the needle indicates halfway between 100 and 260 (just as an example) that does not mean 180, it's probably less (check your FSM).
Old 01-23-2017, 03:28 PM
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JimLentz
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Originally Posted by markKlein
Looking on eBay I see the 92 does have a GAUGES button? What happens when you press that? Later years have both the analog gauge and the digital display, and the digital is normally much more accurate (also, the analog gauge is not proportional, so if the needle indicates halfway between 100 and 260 (just as an example) that does not mean 180, it's probably less (check your FSM).
I think the ECM also uses the readings that the digital gauge uses.
Old 01-23-2017, 07:58 PM
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belairbrian
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Originally Posted by markKlein
Sorry, the 94 had a digital coolant temp display; I assumed the 92 did also. Might be worth borrowing a temp reader and seeing what it is going through the hoses, but I think blend door is the best guess.
I have a couple of infrared temp guns I can use.

So if it is the blend door and I end up taking the dash apart to get to it, should I go ahead and change a potentially 25 year old heater core while I'm in there?
Old 01-23-2017, 08:18 PM
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Viper588
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Originally Posted by markKlein
Sorry, the 94 had a digital coolant temp display; I assumed the 92 did also. Might be worth borrowing a temp reader and seeing what it is going through the hoses, but I think blend door is the best guess.
My 92 does have both analog gauge on dash an digital gauge.
Old 01-24-2017, 06:21 PM
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Lanaue
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Does your hvac fan come on?

Last edited by Lanaue; 01-24-2017 at 06:21 PM.
Old 01-24-2017, 08:06 PM
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belairbrian
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Originally Posted by Lanaue
Does your hvac fan come on?
The fan comes on and blows good. Selecting dash, floor, defrost, etc causes the vents to change correctly.
Old 01-24-2017, 08:54 PM
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Sounds like the AC/Heater programmer to me.
Old 01-25-2017, 05:23 PM
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Originally Posted by belairbrian
The fan comes on and blows good. Selecting dash, floor, defrost, etc causes the vents to change correctly.
Hopefully, there's pookie in the heater core which might go away with a good flush/backflush. Check the heater inlet and outlet hose temps with your hand. If inlet is hot, and outlet is cool it's probably not circulating - blocked.
There are lots of YouTube video's on flushing the heater core.
Enjoy the new corvette!
Old 01-25-2017, 06:39 PM
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Originally Posted by Gibbles
For the turn signal/brights, do you have a bunch of play in the steering wheel?
​​​​​​​like lift the wheel up and down sorta slop.

Don't tell me, GM was still to cheap to even locktite the title bolts on a Vette?

My 86 Firebird was like that, sharp right turn would turn the key off... fun.

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