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Author Topic: A/C or heater stop blowing.  (Read 6227 times)

Offline Redcell

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A/C or heater stop blowing.
« on: May 31, 2010, 09:50:52 pm »
What would cause this? What should I start checking first. The rear still blows great. 87 chev burb
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Offline beastie_3

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Re: A/C or heater stop blowing.
« Reply #1 on: May 31, 2010, 11:13:23 pm »
Fuse, relay, grounds, switch.
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Offline Redcell

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Re: A/C or heater stop blowing.
« Reply #2 on: June 01, 2010, 11:14:41 am »
Where would I find the relays?
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Offline beastie_3

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Re: A/C or heater stop blowing.
« Reply #3 on: June 01, 2010, 11:46:25 am »
Its on the heater box in the engine compartment. Get a mechanic book for your truck. There is a wiring diagram in the Technical section. Trace all the wires and check connections and such.
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Offline VileZambonie

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Re: A/C or heater stop blowing.
« Reply #4 on: June 01, 2010, 12:09:49 pm »
Always start at the source of the malfunction. In this case go directly to the blower motor and verify you have a good connection. Turn the blower on hi and check for B+ at the connector. Report back
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Redcell

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Re: A/C or heater stop blowing.
« Reply #5 on: June 01, 2010, 03:17:59 pm »
any  mechanic books you recomend? I have a haynes.
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Offline VileZambonie

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Re: A/C or heater stop blowing.
« Reply #6 on: June 01, 2010, 03:59:01 pm »
Factory service manual
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              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Redcell

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Re: A/C or heater stop blowing.
« Reply #7 on: June 02, 2010, 07:48:12 am »
It was the blower motor. replaced it and it blows really great now. Thanks for the help guys.
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Offline VileZambonie

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Re: A/C or heater stop blowing.
« Reply #8 on: June 02, 2010, 04:18:01 pm »
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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