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05-27-2016, 01:10 AM
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#1 |
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Registered User
Join Date: Aug 2011
Location: Lethbridge Montana
Posts: 259
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blowing heat/ac fuse
Hello everybody i am working on a 1984 chev truck and the heat/ac fuse keeps blowing when you put the fan on high speed ? And the Oil Pressure Gauge stays pegged over to the right ? Any help on this would be greatly appreciated thank you
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05-27-2016, 05:18 AM
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#2 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
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Re: blowing heat/ac fuse
Download the 1984 wiring diagrams from the manual link in my signature. Option C60 (AC) is the bottom left panel of the right hand block of PDF page 14.
The HI setting doesn't power the fan directly it closes the contacts on a relay on the AC housing in the engine bay. Either the orange wire from the switch to the relay coil is damaged and shorting or the relay itself is shorting internally. Unplug the switch and relay then ohm the orange wire to a good ground... the meter should read ∞ ( the same as unconnected meter probes ) if it reads anything else the wire is damaged.
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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...
And please let us know if and how your repairs were successful. |
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