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I have a 1975 chevy corvette stingray, the wiring harness is connected correctly but the blower motor will not go on high setting

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  • 11 Answers

Replace fan speed selector switch.

Posted on Feb 21, 2012

  • sommalinda Feb 21, 2012

    Replaced that already

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2 Answers

A/c blower motor works if I pull power and plug back in until I cut engine off. Then I have to repeat process


Daryl, You may want to check the blower relay/ just switch with one of same type and try and if OK, problem could be the blower motor, wires/plug loose,damaged,burnt or a faulty blower motor resistor. Second link has some trouble shooting of a overheating wire problem, that is to be common in these trucks. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
DIY 2003 Silverado Blower Motor Resistor
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Jul 19, 2016 | 2003 Chevrolet Silverado 1500

2 Answers

Why does blower on A/C sometimes work and sometimes don't on my Saturn 2007 aura


Blower motor control processor would be a good guess but I'm not in the guessing business , you need to test power an grounds for lose connections or corrosion , check for DTC'S in the HVAC control panel an if none , there are three different diagnostic flow charts from Saturn service info .
Blower Motor Always On Blower Motor Inoperative Blower Motor Malfunction
Myself I'd say Blower motor malfunction flow chart !

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

Place the blower motor switch in each speed position.
Does the blower motor operate at the desired speeds?
yes / no
Go to Testing for Intermittent Conditions and Poor Connections
Go to Step 3

3

  1. Disconnect the harness connector of the blower motor control processor.
  2. Measure the voltage between the battery positive voltage circuit and the ground circuit of the blower motor control processor.
Does the voltage measure within the specified range?
10-14 V yes / no
Go to Step 4
Go to Step 6

4

  1. Connect the blower motor control processor.
  2. Disconnect the harness connector of the HVAC control module.
  3. Measure the voltage on the blower motor speed control circuit.
Does the voltage measure within the specified range?
4.5-5.5 V
Go to Step 7
Go to Step 5

5

Test the control circuit of the blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 7

6

Test the battery positive voltage circuit of the blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 9

7

Inspect for poor connections at the harness connector of the blower motor control processor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 10

8

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 11

9

Repair a high resistance in the ground circuit of the blower motor control processor. Refer to Circuit Testing .
Did you complete the repair?
--
Go to Step 12
--

10

Replace the blower motor control processor. Refer to Blower Motor Control Processor Replacement .
Did you complete the replacement?
--
Go to Step 12
--

11

Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
--
Go to Step 12
--

12

Operate the system in order to verify the repair.
Did you correct the condition?
--
System OK
Go to Step 2
Good luck , hope this helps !

Jul 11, 2015 | 2007 Saturn Aura XR Sedan

1 Answer

What are the lug nut torque specs for a 1975 corvette stingray?


For 1965-1982 Corvettes
rally wheels (steel) are 75ft/lbs.
optional wheels (alumiminum) 80ft/lbs. retorque every 100 miles

Aug 04, 2014 | Cars & Trucks

2 Answers

Only hi speed on ac blower motor


This problem is caused by a burnt out Blower motor speed control resistor. The part is near the Blower motor and is held into the air duct by two small hex head screws. The part is chap and easy to replace.

Aug 30, 2011 | 1981 Chevrolet Corvette

2 Answers

Why doesn't ac blower work on number 5 setting? it is a chevy hd gas engine


Most likely the blower motor resistor. It's mounted next to the blower motor under the dash. Also check the 7 wire plug going to it, GM had a problem with that plug, and the wiring getting hot and melting. The plug is $68.00 from the dealership. One of my customer's car had the same problem.

May 25, 2010 | 2001 Chevrolet Silverado 2500HD

1 Answer

2006 silverado 5 speed heat, the high speed is not working. I do have the 4 lower speeds


The switch, high blower speed relay or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the relay and may be the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the blower relay or wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Silverado running 100% again soon.

Jan 07, 2010 | 2006 Chevrolet Silverado 2500HD 2WD

1 Answer

2000 chevy impala, air conditioning does not work


It sounds like the blower resistor needs to be replaced and the blower motor it self. Auto Zone will have the blower and resistor that you need to replace and will have the step by step instructions for you to get the job done with common tools and will take about 2 hours if your good with tools. Good luck and keep me posted. Setting 5 should have 12 volts running to the blower motor so check the wire harness for voltage readings at the blower motor harness clip, you may only just need a new blower motor.

Nov 08, 2009 | 2000 Chevrolet Impala

1 Answer

No tail lights on 1975 corvette stingray and i have replaced bulbs


most likely the ground is weak. trace the ground wire that feeds the tail lights back to the frame and clean up the connection. one way to do that is with a electronic spray from any auto parts store

Sep 15, 2009 | Chevrolet Corvette Cars & Trucks

1 Answer

Tach. operates in reverse


I have heard of this happening when the tach is wired to the coil incorrectly. Most (if not all) tachs call for the signal wire to be connected to the NEGATIVE side of the coil. Trace your wiring to/from your tach and go from there...

I hope this helps! -Nick

Mar 27, 2009 | 1984 Chevrolet Corvette

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