Yesterday my heater stopped blowing, BUT heat comes from there, I thought that the problem was in the heater and replaced it, after that the new heater started working BUT after the second start of the engine they stopped blowing again and then I realized that the problem was not in the heater, now, I take out the heater connector and put it back in again and the heater works only the first time it starts, the second time it doesn’t work, tell me what the problem could be

 

Did you also replace the blower motor resistor?

 

no, but i can try, if not what its can be ?

 

changed resistors, previous one was burnt, cleaned contacts put a new one and now working, hopefully Thanks for help

 

 

2016 Express 4500 Blower does not blow for any setting. It was working wehn I parked the RV in Sept
Replaced the special
[img alt="Blower heater
"]https://cimg2.ibsrv.net/gimg/chevroletforum.com-vbulletin/1024x768/blower_fuse_medium__95f159b6623289983e42cae20451d0 0ef8446027.jpg[/img]
Blower heater

Blower fuse connection

Fues box
blower Fuse based on another thread. nothing
Heavy red wire on engine end of the 5 prong plug is delivering 12v to the harness
Blower fuse connection

I get no 12V on wire from the fuse to the fan motor
Fuse to harness connections all look OK on the new fuse nodule
Swapped relays in fues truck chassis box based on a post the the relay to the blower could be faulty did not fix the problem Suggestions apreciated.

 

Confirmed Fan works. Replaced the relay at #40
Are there other fuses at location other than box driver side of engine compartment?