Heater question
Thread Starter
Cruising
Joined: Oct 2017
Posts: 13
Likes: 0
From: California Maryland
Heater question
So my A/c works wonderfully. All buttons on the climate control seem to function properly. But when I switch to heat there’s no hot air. Is this a flapper/mixer door problem???
Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
We might need to back up. I forgot to ask what year corvette. Early cars have heater valves. Which can stop hot water from circulating through the core. Later ones always circulate water.
But if you ran diagnostics like in this video, Did you have a flashing light and did you get a code 01 or 02?
But if you ran diagnostics like in this video, Did you have a flashing light and did you get a code 01 or 02?
Thread Starter
Cruising
Joined: Oct 2017
Posts: 13
Likes: 0
From: California Maryland
We might need to back up. I forgot to ask what year corvette. Early cars have heater valves. Which can stop hot water from circulating through the core. Later ones always circulate water.
But if you ran diagnostics like in this video, Did you have a flashing light and did you get a code 01 or 02? https://www.youtube.com/watch?v=lWIrT8tN-a8
But if you ran diagnostics like in this video, Did you have a flashing light and did you get a code 01 or 02? https://www.youtube.com/watch?v=lWIrT8tN-a8
my my car is a 1993. I will give all of this a try this weekend. Thanks a ton for all the help.
Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
Since it's a 93 it definitely is a constant flow heater core.
Not sure when you bought the car, If new to you someone may have bypassed the heater core. Really hard to see since the fittings are under the coolant tank.
The motor is not fun to change. So if anything else could cause it, it's worth considering.
Not sure when you bought the car, If new to you someone may have bypassed the heater core. Really hard to see since the fittings are under the coolant tank.
The motor is not fun to change. So if anything else could cause it, it's worth considering.
Last edited by belairbrian; Oct 12, 2017 at 02:10 PM.
Drifting
Joined: Jul 2004
Posts: 1,356
Likes: 291
From: MA
Probably the blend door motor went bad. There is a plastic gear in the blend door motor assembly that cracks on the metal shaft that opens and closes the blend door.
The "auto" fan button usually becomes disabled (fan stops blowing when pressed) when it goes bad, at least mine did.
The "auto" fan button usually becomes disabled (fan stops blowing when pressed) when it goes bad, at least mine did.
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Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
So the fault is somewhere in the blend door circuit.
Door motor, connector C295, or the Heat and A/c Programmer
First step is to disconnect negative battery for 1 minute to reset the system and see if it clears the problem.
The code 01 diagnostic chart starts on page 1C1-8 of the FSM.
Door motor, connector C295, or the Heat and A/c Programmer
First step is to disconnect negative battery for 1 minute to reset the system and see if it clears the problem.
The code 01 diagnostic chart starts on page 1C1-8 of the FSM.
