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2004 Silverado 4.3 A/C hot!

2004 Silverado 4.3 A/C hot!

Postby Redsox18 [OP] » Sep 22 2020, 4:59am

2004 4.3v6 single cab. A/C just randomly started blowing hot air while A/C is on and recirculation on, and I mean hot. What's your first check? Thanks again for all the help. This place is a life saver.
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Redsox18
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
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Year: 2004
Make/Model: Chevrolet Silverado
Variant: Z71
Extra Info: 4.3 V6 5 speed
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Re: 2004 Silverado 4.3 A/C hot!

Postby chem_man » Sep 22 2020, 10:59am

First make sure your A/C compressor is engaging. Second, if the A/C compressor is engaging, is the low side A/C hose cold to the touch, and is the high side A/C hose warm to hot to the touch?

If the answer is yes to the above, then my guess would be the blend door actuator inside the dash is stuck in the full heat position.

There are several write ups here on how to go about replacing the actuator(s).

Good Luck!
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chem_man
Combustion on 1 piston [L2]
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Re: 2004 Silverado 4.3 A/C hot!

Postby chem_man » Sep 22 2020, 11:01am

Forgot to add, that if the answer is no to those questions, then you'll need a set of A/C manifold gauges in order to see how the high and low side A/C pressures are for further diagnostics.
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chem_man
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 180
Joined: May 19 2012, 1:51am
Years of membership: 8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership8 years of membership
Location: Maryland
Year: 1999
Make/Model: Chevrolet Silverado
Variant: LS
Extra Info: Ext Cab 5.3L V8 2WD
Group Membership:
Registered users

Re: 2004 Silverado 4.3 A/C hot!

Postby OlWhiskey » Sep 22 2020, 11:27am

I had a similar problem and it turned out to be the blend door actuator under the passenger side of the dash, closer to the center. I unbolted it and turned the door manually and could switch back and forth between hot/cold so I replaced the actuator.
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OlWhiskey
Combustion on 6 pistons [L2]
Combustion on 6 pistons [L2]
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Year: 2001
Make/Model: Chevrolet Silverado
Variant: LS
Extra Info: 1500 4.8L
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Re: 2004 Silverado 4.3 A/C hot!

Postby Redsox18 [OP] » Sep 22 2020, 7:18pm

Thanks guys I'll give it a look this weekend. I appreciate the help.
Original Poster
Redsox18
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 11
Topics: 3
Joined: Jul 18 2020, 10:40am
Year: 2004
Make/Model: Chevrolet Silverado
Variant: Z71
Extra Info: 4.3 V6 5 speed
Group Membership:
Registered users

Re: 2004 Silverado 4.3 A/C hot!

Postby OlWhiskey » Sep 22 2020, 10:52pm

No worries, let us know how it goes.
User avatar
OlWhiskey
Combustion on 6 pistons [L2]
Combustion on 6 pistons [L2]
Posts: 684
Topics: 68
Images: 25
Joined: Nov 12 2014, 2:27pm
Years of membership: 5 years of membership5 years of membership5 years of membership5 years of membership5 years of membership
Location: Ontario
Year: 2001
Make/Model: Chevrolet Silverado
Variant: LS
Extra Info: 1500 4.8L
Group Membership:
Registered users

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