How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 4768
Experience:  Owner at DJ Wilson
65405794
Type Your Medium and Heavy Trucks Question Here...
Daniel Wilson is online now
A new question is answered every 9 seconds

I have 09 Cascadia vin # AB1636 . Hvac system has been a

Customer Question

I have 09 Cascadia vin # ***** . Hvac system has been a issue for years ....
problems .... AC is cold and has always been cold ...front blower has weak flow and does not respond to selected options from the controller....it does not direct flow to the selection.
I get flow out of all the vents no matter what is selected. flow is best when turned all the
way up. anything les than that and the weak flow is reduced to a whisper at best.
Shop has replaced blower again along with sam cab mod , to no avail.....still have issue
along with some new ones .... rear air and blower now out totally , does not power up at all , fog lamps out totally...... I'm no mechanic but this sounds like a short in the system
that is pulling a lot of amp draw and creating low voltage. continuing to wear out the blower and possibly damaging other components
codes displayed ..... sam controller rsrvc 249s 254 14
hvac controller open 146s 254 05
MSF controller rsrvc 164s 254 14
hvac sa25 spn001548 05
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 11 months ago.

Hi my name is***** will be glad to help. What do you have logged for fault codes in the dash panel?

Expert:  Daniel Wilson replied 11 months ago.

I see them posted now. Bare with me while I pull up your information on your codes

Expert:  Daniel Wilson replied 11 months ago.

25

1548

05

COTC Sensor short to battery, or open circuit.

Expert:  Daniel Wilson replied 11 months ago.

MID 146 is the Front HVAC.

Modular Switch

Field (MSF)

49

(49)

(164)

SAM Cab

33

(33)

(249

Expert:  Daniel Wilson replied 11 months ago.

FMI

Description

06

Current above normal, or grounded circuit.

07

Mechanical system not responding, or out of adjustment.

08

Abnormal frequency, pulse width, or period.

09

Abnormal update rate.

10

Abnormal rate of change.

11

Root cause not known.

12

Bad intelligent device or component.

13

Out of Calibration.

14

Special Instructions.

15

Data valid but above normal operational range–Least severe level.

16

Data valid but above normal operational range–Moderately severe level.

17

Data valid but below normal operational range–Least severe level.

18

Data valid but below normal operational range–Moderately severe level.

19

Received network data in error.

20-30

Reserved for future assignment by SAE.

31

Condition exists.

Expert:  Daniel Wilson replied 11 months ago.

i do not normally do this but since my time is limited today on here. click this link for the troubleshooting information and diagrams.

Troubleshooting

Related Medium and Heavy Trucks Questions