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#1 |
Registered User
Join Date: Nov 2011
Location: So. Calif
Posts: 305
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Where is the rheostat located?
On my 74 c10 my heater never worked and I never looked into it. But this weekend we were troubleshooting why my headlights would not come on and found out it was my headlight switch had blown and blew out both head lights. Then we saw that the fuse for heater was blown. Put new fuse in and heater came on and all fan speeds worked but would not turn off so we unplugged fan. We did not have time to look further into it and plan on maybe next weekend but friend said that it could be bad rheostat. I looked them up on different sites for pricing but they won't come up. Is this part together with the fan blower or other part and not a stand alone part? Where is it located on the truck?
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1974 C10 swb 350 1977 3/4 ton Silverado 454 1999 2 door 2wd Tahoe |
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#2 |
Registered User
Join Date: Apr 2014
Location: PR
Posts: 85
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Is this what you're talking about? From RockAuto, 1974 CHEVROLET C10 PICKUP 4.1L 250cid L6 : Heat & Air Conditioning : Blower Motor Control Module / Resistor , STANDARD MOTOR PRODUCTS Part # RU67
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#3 |
Registered User
Join Date: Jun 2012
Location: Meeker, ok
Posts: 146
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Re: Where is the rheostat located?
If you are talking about the resistor its located on the hvac box. The relay is as well.
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Trevor 74 C20...work in progress. 04 Saturn Ion...Daily Driver |
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#4 | |
Registered User
Join Date: Nov 2011
Location: So. Calif
Posts: 305
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Re: Where is the rheostat located?
Quote:
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1974 C10 swb 350 1977 3/4 ton Silverado 454 1999 2 door 2wd Tahoe |
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#5 |
Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: Where is the rheostat located?
No, the rheostat is an ambient temp switch mounted near the evap core that opens contacts if the core temp falls below 34F. It is a NC circuit. If the core gets too cold, it shuts off the AC compressor to prevent it from freezing over.
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#6 |
Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: Where is the rheostat located?
The fuse was probably pulled to stop the fan motor from running all the time. I think that's normal on some of the early 70's trucks. They will run and circulate air even when the switch is off. Most people just unplug the wire going to the fan motor.
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Born and proudly residing in a Red State ! |
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#7 | |
Registered User
Join Date: Nov 2011
Location: So. Calif
Posts: 305
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Re: Where is the rheostat located?
Quote:
Gmachinz..Oops, i thought this was the part. Thanks for the heads up. will look into the right area.
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1974 C10 swb 350 1977 3/4 ton Silverado 454 1999 2 door 2wd Tahoe |
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#8 |
Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: Where is the rheostat located?
Yeah the climate control cable has an "off" position but the blower fan only goes down to "low" which basically still sends powers through all 3 resistors in series making the blower motor run real slow-so it never really stops.
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#9 |
Registered User
Join Date: Apr 2007
Location: Birmingham AL
Posts: 271
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Re: Where is the rheostat located?
Slam59 does your blower motor run with the key removed from the ignition switch?
With the ignition switch in the off position the blower motor should NOT be running.
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Stock 75 C10 step side. 350 2 BBL, 350 trans. 150K miles. |
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#10 |
Registered User
Join Date: May 2012
Location: mt solon va
Posts: 117
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Re: Where is the rheostat located?
The 3 prong maybe for non a/c trucks. When I replaced mine they said with or with out a/c. Might want to check that be for buying.
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#11 | |
Registered User
Join Date: Nov 2011
Location: So. Calif
Posts: 305
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Re: Where is the rheostat located?
Quote:
85 Chevy no my truck has no ac so I guess that's why it has the 3 prongs
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1974 C10 swb 350 1977 3/4 ton Silverado 454 1999 2 door 2wd Tahoe |
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#12 |
Registered User
Join Date: Apr 2013
Location: Pasadena, Maryland
Posts: 160
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Re: Where is the rheostat located?
On my 77 non A/C truck, I pulled a wire out of the connector to stop the fan from running all the time. I think it was the double wire.
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#13 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Where is the rheostat located?
my 78 had a three speed always on fan,I cut the looped brown at the switch.
my 79 had a four speed always on fan,I cut the looped brown at the switch. the 2 Blower Motor Control Modules are different in both trucks, now the low is off,both are non-AC trucks
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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