Heat/AC Issue
#1
Heat/AC Issue
My AC and heat only work an the HIGH setting. Any ideas why and how to fix this??? My baby is a 2000 2DR 2x2 Blazer with manual ac/heat controls......I think.
#2
RE: Heat/AC Issue
By heat and A/C, you are really referring to the fan itself, correct?
If that is the case, then the most probable cause is the blower motor resistor block which is located on top of the HVAC housing under the hood.
If that is the case, then the most probable cause is the blower motor resistor block which is located on top of the HVAC housing under the hood.
#3
RE: Heat/AC Issue
I'm having this exact same problem also. The fan does work on level 1 or 2. If I switch it to level 3 or 4 it works. Once I get going, it will then sometimes work on level 1 and 2.
How much is this resistor?
Thanks,
Rick
How much is this resistor?
Thanks,
Rick
#4
RE: Heat/AC Issue
ACDELCO Part # 1571991 {replaces 15652873 #15094285, 15652873} Blower Motor Resistor $12.05 - RockAuto.com
That part number is good for both the OPs 2000 and your 1999, C5Longhorn, with manual HVAC controls only.
That part number is good for both the OPs 2000 and your 1999, C5Longhorn, with manual HVAC controls only.
#5
RE: Heat/AC Issue
Thanks Swartlkk,
Is it easy to diagnose whether its the relay or resistor? I've heard that if level 1 and 2 don't work it may be the relay. Either way, I'm happy to see that hopefully it won't be too expensive to repair.
Rick
Is it easy to diagnose whether its the relay or resistor? I've heard that if level 1 and 2 don't work it may be the relay. Either way, I'm happy to see that hopefully it won't be too expensive to repair.
Rick
#6
RE: Heat/AC Issue
Everything but high is controlled by the resistor. If high works, the relay is good.
#7
RE: Heat/AC Issue
Kyle,
You are a wealth of info. Thanks again for the tips.
You are a wealth of info. Thanks again for the tips.
#8
RE: Heat/AC Issue
Is it necessary to put the black cover piece that was cut out back on with black sillicone adhesive.
#9
RE: Heat/AC Issue
I wouldn't worry about it unless you cut it real clean and want to duct tape it-I usually don't. Jerry
#10
RE: Heat/AC Issue
My only concern was water and moisture. If that's not a problem, then I'm not putting it back on.
Rick
Rick