Re: Air in Fuel Filter Update. I fixed the truck a while ago but did not get around to posting.I took off the fuel filter lid and pressurised t[more ...] Posted by georg 27 Mar : 19:33
Re: freightliner mt45 brake lights I have ran into a couple of business class that the wiring going to the rear along the frame was the issue. The loom wil[more ...] Posted by Goodysnap 26 Mar : 07:54
Re: Emissions Tampering Goody, I have not and will not, for years perform any deletes etc. I have, in the past had units that have been "tampere[more ...] Posted by kmodel 26 Mar : 00:59
freightliner mt45 brake lights The brake lights on my truck have not been working lately. The turn signals work, and all the fuses and breakers seem to[more ...] Posted by upnorthplumber 25 Mar : 13:21
Emissions Tampering I found this article very informative, so I thought I'd share. Thoughts? What Policies or procedures do you have in plac[more ...] Posted by Goodysnap 25 Mar : 09:13
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We have a 2010 Prostar that has problems with the airflow coming out the vents while going down the highway. He will be going down the highway and the airflow will reduce to almost nothing. When the driver comes to a stop, it will start back up again. We have verified function of all of the actuators and ductwork.The blower motor also doesn't reduce speed. Anybody have any tips/experience with this problem? VIN 3HSCUAPR4AN272126
No experience with that exact problem on that exact truck, but I have few suggestion or questions to ask yourself. 1. Could the module on the blower motor be going out when it gets hot? 2. You said heater, but could the unit also be in defrost mode and the evaporator is freezing up from the A/C clutch staying on due to faulty inlet and outlet temperature readings. You will need to use dimaond logic builder to look at those 2 temperatures. If the evaporator freezes it will restrict air flow. In the winter time there is a larger delta between outside ambient temperature to condensor temperature, so the system can pull heat out of the system much quicker going down the highway versus when the unit stops.
Freightliners use to have that problem all the time with the Blend air system, winter or summer. Driver complaint no air flow. The HVAC relay would stick close and the system could not cycle the A/C clutch to prevent freeze up. You could indentify this by turning on the ignition switch and the compressor clutch would be engaged. On a blend air system the clutch should not be enaged with just key on, a parameter that needs to be seen by the AC module is engine rpm above 500 rpm for 15 seconds.
I belive you can do this same check on a ProStar, the A/C clutch output is direct from the Body Controller to the clutch and it does need to see engine rpm for engagement. Hope this helps with some of the troubleshooting proccess.
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