bubs99

1999 6 spd with manual air - Had water back up in blower motor area. Motor stopped working, checked fuse ok replaced BM resistor still no blower motor. Hooked motor up directly to battery no spin. Took motor apart and cleaned brushes then tested directly to battery with jumpers motors spins. Connected to resistor lead still no blower. Is there a relay I am failing to find or control module ????Not sure what to do next.
Have power going into resistor but nothing coming out.

also cleaned out ac drain and all kinds of debris came out. sucked it out with a shop vac.


Please help....

Thanks

bub

Bill Dearborn

What year car do you have and do you have manual or automatic air? There are some differences.
Bill

bubs99

1999 6 spd hardtop - manual air.
Thanks

bubs99

Anyone?????

SteveDoten

7/32" socket; pull the motor 3 screws, work it free by hand, spray wd-40; or new one for $80; i spent $2 on wd-40

bubs99

Motor spins I can't get it to come on. Tested it directly to battery. Replace resistor and checked fuses. Is there a relay I need to check or ???

Bill Dearborn

Blower Motor Relay
Mounted on the multi use relay and fuse bracket, above the Body Control Module (BCM).

Here is a diagnostic from the Service Manual.

Document ID# 376581
1999 Chevrolet/Geo Corvette


--------------------------------------------------------------------------------

Blower Motor Inoperative at Any Speed
Blower Motor Inoperative at Any Speed <<C60>> Step
Action
Value(s)
Yes
No

DEFINITION: Blower motor is inoperative at any selected speed.

1
Were you sent here from the HVAC System Check (C60)?
--
Go to Step 2
Go to HVAC System Check

2
Disconnect the blower motor connector.
Turn the ignition switch to the ON position.
Place the HVAC mode switch in the UPPER position.
Turn the blower switch to the LO position.
Connect a DMM between terminal A of the blower motor connector and a known good ground.
Measure the available voltage at terminal A of the blower motor connector.
Is the voltage within the specified values?
10.0 -14.0V
Go to Step 3
Go to Step 10

3
Connect a DMM between a good ground and terminal B of the blower motor connector.
Measure CKT 150 for continuity to ground.
Is the resistance to ground less than the specified value?
0.5ohms
Go to Step 4
Go to Step 5

4
Replace the blower motor. Refer to Blower Motor and Fan Replacement .

Is the repair complete?
--
Go to HVAC System Check
--

5
Disconnect the blower motor control module connector C2.
Connect a DMM between the blower motor control module connector C2 terminal 2 and a good ground.
Measure CKT 150 for continuity to ground.
Is the resistance to ground less than the specified value?
0.5ohms
Go to Step 6
Go to Step 7

6
Locate and repair an open or a high resistance in CKT 150 (blk wire) between the blower motor connector and the blower motor control module connector C2.

Is the repair complete?
--
Go to HVAC System Check
--

7
Disconnect the blower motor control module connector C1.
Connect a DMM between the blower motor control module connector C1 terminal E and a good ground.
Measure CKT 150 for continuity to ground.
Is the resistance to ground less than the specified value?
0.5ohms
Go to Step 8
Go to Step 9

8
Replace the blower motor control module. Refer to Blower Motor Resistor Replacement .

Is the replacement complete?
--
Go to HVAC System Check
--

9
Locate and repair an open or a high resistance in CKT 150 between the blower motor control module connector C1 and G202.

Is the repair complete?
--
Go to HVAC System Check
--

10
Disconnect the blower motor relay.
Connect a DMM between the blower motor relay connector terminal A1 and a good ground.
Measure CKT 150 for continuity to ground.
Is the resistance to ground less than the specified value?
0.5ohms
Go to Step 12
Go to Step 11

11
Locate and repair an open or a high resistance in CKT 150 between the blower motor relay connector and G202.

Is the repair complete?
--
Go to HVAC System Check
--

12
Connect a DMM between the blower motor relay connector terminal C2 and a good ground.
Turn the ignition switch to the ON position.
Measure the available voltage at the blower motor relay connector terminal C2.
Is the voltage within the specified values?
10.0 -14.0V
Go to Step 16
Go to Step 13

13
Check the HVAC MiniFuse® #18 for an open circuit.

Is the fuse open?
--
Go to Step 15
Go to Step 14

14
Locate and repair an open or a high resistance in CKT 41 between the blower motor relay connector and the instrument panel electrical center.

Is the repair complete?
--
Go to HVAC System Check
--

15
Locate and repair a short to ground in CKT 41 between the blower motor relay connector and the instrument panel electrical center.

Is the repair complete?
--
Go to HVAC System Check
--

16
Connect a DMM between the blower motor relay connector terminal C1 and a good ground.
Measure the available voltage at the blower motor relay connector terminal C1.
Is the voltage within the specified values?
10.0 -14.0V
Go to Step 20
Go to Step 17

17
Check the BLO MOT MaxiFuse® #49 for an open circuit.

Is the fuse open?
--
Go to Step 19
Go to Step 18

18
Locate and repair an open or a high resistance in CKT 1342.

Is the repair complete?
--
Go to HVAC System Check
--

19
Locate and repair a short to ground in CKT 1342.

Is the repair complete?
--
Go to HVAC System Check
--

20
Reconnect the blower motor control module connectors.
Reconnect the blower motor connector.
Connect a fused jumper wire between the blower motor relay connector terminal C1 and terminal A2.
Turn the blower motor fan switch to the low position.
Does the blower motor operate?
--
Go to Step 21
Go to Step 22

21
Replace the blower motor relay.

Is the replacement complete?
--
Go to HVAC System Check
--

22
Fused jumper wire is still connected between the blower motor relay connector terminal C1 and terminal A2.
Disconnect the HVAC Control Assembly connector C2.
Connect a DMM between the HVAC Control Assembly connector C2 terminal B and a good ground.
Measure the available voltage at the HVAC Control Assembly connector C2 terminal B.
Is the voltage within the specified values?
10.0 -14.0V
Go to Step 24
Go to Step 23

23
Locate and repair an open or a high resistance in CKT 42.

Is the repair complete?
--
Go to HVAC System Check
--

24
Connect the blower motor connector.
Connect the blower motor control module connectors C1 and C2.
Fused jumper wire is still connected between the blower motor relay connector terminal C1 and terminal A2.
Connect a fused jumper wire between terminal B and terminal H of the HVAC Control Assembly connector C2.
Does the blower motor operate?
--
Go to Step 25
Go to Step 26

25
Replace the HVAC Control Assembly. Refer to Control Assembly Replacement .

Is the replacement complete?
--
Go to HVAC System Check
--

26
Replace the blower motor control module. Refer to Blower Motor and Fan Replacement .

Is the replacement complete?
--
Go to HVAC System Check
--



--------------------------------------------------------------------------------
Document ID# 376581
1999 Chevrolet/Geo Corvette


Bill

bubs99

Thanks to Bill and the schematic he sent me I was able to trace my fan motor not working. Turned out to be the relay. But without the schematic I wouldn't have found which one it was. So thanks to you Bill for your responses.

Bub

Butz

Carl Timonen