AC on my 2004 Silverado - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigd65 · 09-23-2024, 12:01 PM

I got in my truck at work and the AC stopped blowing on the #4 setting. I just replaced the HIGH speed resistor. Is this my control panel going out... works on all other settings.

bigd65 · 09-25-2024, 09:04 AM

Anyone?.. those control panels are not cheap. I don't want to just throw parts at it

**hatzie** · 09-25-2024, 09:24 PM

The squarebody blower HI position bypasses the resistor.

I'll look in my service manual for the wiring diagram.
I assume you don't have the digital climate control head.

bigd65 · 09-27-2024, 03:47 PM

No sir,not digital... has the two knobs. Left for fans speed, right is for level adjustments. Then the two center are for temp control on either side

**hatzie** · 09-27-2024, 09:06 PM

Supposedly there's a Blower relay that energizes when the switch is set to HI
When the relay is not energized the blower gets power from the resistor pak
When the relay is energized it gets power directly from the blower fuse

**hatzie** · 09-28-2024, 01:39 PM

Ground G200 is a straight up stud under the top cover of the dash back near the windshield. All kinds of fun to reach. Since the blower motor works on L & Med settings I'd guess this ground is just fine.

The blower resistor includes the HI speed fan relay.

Check the 40A Blower fuse in the engine compartment fuse/relay panel has power with the ignition switched on. The diagram calls the L-BEC "Junction Block I/P".
Check the RED wire into the blower resistor/relay pak and check the disconnect at the L-BEC behind the LH dash fuse panel.
Check the orange wire from the blower switch to the resistor pak with the blower switched to HI.

09-23-2024, 12:01 PM	#1
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	AC on my 2004 Silverado I got in my truck at work and the AC stopped blowing on the #4 setting. I just replaced the HIGH speed resistor. Is this my control panel going out... works on all other settings. __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe

09-25-2024, 09:04 AM	#2
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	Re: AC on my 2004 Silverado Anyone?.. those control panels are not cheap. I don't want to just throw parts at it __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe

09-25-2024, 09:24 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,975	Re: AC on my 2004 Silverado The squarebody blower HI position bypasses the resistor. I'll look in my service manual for the wiring diagram. I assume you don't have the digital climate control head. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

09-27-2024, 09:06 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,975	Re: AC on my 2004 Silverado Supposedly there's a Blower relay that energizes when the switch is set to HI When the relay is not energized the blower gets power from the resistor pak When the relay is energized it gets power directly from the blower fuse __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

09-28-2024, 01:39 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,975	Re: AC on my 2004 Silverado Ground G200 is a straight up stud under the top cover of the dash back near the windshield. All kinds of fun to reach. Since the blower motor works on L & Med settings I'd guess this ground is just fine. The blower resistor includes the HI speed fan relay. Check the 40A Blower fuse in the engine compartment fuse/relay panel has power with the ignition switched on. The diagram calls the L-BEC "Junction Block I/P". Check the RED wire into the blower resistor/relay pak and check the disconnect at the L-BEC behind the LH dash fuse panel. Check the orange wire from the blower switch to the resistor pak with the blower switched to HI. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 09-30-2024 at 12:16 PM.

09-27-2024, 03:47 PM	#4
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	Re: AC on my 2004 Silverado No sir,not digital... has the two knobs. Left for fans speed, right is for level adjustments. Then the two center are for temp control on either side __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe



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