Need some guidance
06-25-2020, (Subject: Need some guidance ) 
Post: #10
RE: Need some guidance
One thing I learned on the 08 ProStar, only use OEM Navistar dealership expansion valves. The thermistors, I have only had to replace once. The front HVAC blower motor had a TSB for overheating. Navistar added a harness with a resistor that goes between the blower motor and the main harness. Also, try to limit the dye in the R134a, as it can really impede the cooling. Also, you must be exact on how much refrigerant goes into the system, get that wrong and bad things happen, this system is very fidgety. Then the high pressure switch, the wiring in the harness is prone to breaking near the sensor. And that HP Switch, at least on my truck, seems to fail periodically for no reason. Good thing, the system does not need to be purged to replace the sensor. Just a few things I have learned over the years. And trust me, I have thousands of dollars in this system, it has been a very punishing experience to get this HVAC system working as it does today.
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06-25-2020, (Subject: Need some guidance ) 
Post: #11
RE: Need some guidance
(06-24-2020 )Waterloo Wrote:  It is very rare anything goes wrong on the ProStar sleeper side of the HVAC. The only thing I have had to replace over the years I have owned my 08 ProStar is the blower motor.

Up front under the hood I installed one of these 12volt valves on the inlet hose to the heater core, I have a deadman’s switch on the dash, HEAT up, COLD down, OFF in the middle. {link invalid}

I also installed three of these yacht fans, they move some serious air and our extremely quiet. https://amzn.to/382kC37
Two in the sleeper just below the top ac vents and one up front hanging from the overhead. I have the fans on these remote switches so I can turn them off or on while driving. https://amzn.to/3806GGT

The AC in my ProStar will literally freeze you out. I have been in the middle of TN in July at 3pm on a blistering summer day and had to turn the heat on, it gets that cold, and is not at all comfortable.

For all of my AC parts, I like these guys out of Atlanta. They normally ship the same day your order is placed and they do sell many OEM parts at huge discounts. I have used them for a few years without issues... http://www.truckersac.com
Mine started acting a fool with the blower motor. It would stop blowing then it would surge sometimes. On off on, high low high. Replaced the motor and didn't make any difference. So I wired it up on a separate switch and it worked. I wasn't crazy about it but it worked. Then it started blowing hot air all the time. That's when I said, I've got 15000 BTUs on the roof so I started using it. I'm sure some day I will pull a few more hairs out and get back there and try to fix it.
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06-25-2020, (Subject: Need some guidance ) 
Post: #12
RE: Need some guidance
so the like $50 blend door actuator probably fried and got stuck on heat.....easy fix go under bunk pull actuator off take flat head screw driver flip to other direction and wallah AC.


User's Signature: 2010 Lonestar - CM871 - 13sp - 3.70s, 2016 T680 - cm2350 - 13sp - 3.36s - skateboarder
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 Thanks given by: Waterloo
06-25-2020, (Subject: Need some guidance ) 
Post: #13
RE: Need some guidance
(06-25-2020 )Lonestar10 Wrote:  so the like $50 blend door actuator probably fried and got stuck on heat.....easy fix go under bunk pull actuator off take flat head screw driver flip to other direction and wallah AC.
Pretty sure it's the evaporater in the floor of the sleeper. If that little bolt breaks that's just not going to be fun.
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06-25-2020, (Subject: Need some guidance ) 
Post: #14
RE: Need some guidance
I don't think there's any electric valves that shut off the freon to the monks of the AC is running Freon should be running through the EVAP unless the orifice or whatever Tube is plugged so if you're getting heat with the AC on most likely the blend door is swung the wrong way. if you have a normal international I'm not quite sure if you have one that has the no idle AC.


User's Signature: 2010 Lonestar - CM871 - 13sp - 3.70s, 2016 T680 - cm2350 - 13sp - 3.36s - skateboarder
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06-25-2020, (Subject: Need some guidance ) 
Post: #15
RE: Need some guidance
(06-25-2020 )Lonestar10 Wrote:  I don't think there's any electric valves that shut off the freon to the monks of the AC is running Freon should be running through the EVAP unless the orifice or whatever Tube is plugged so if you're getting heat with the AC on most likely the blend door is swung the wrong way. if you have a normal international I'm not quite sure if you have one that has the no idle AC.
I was half asleep last night, I meant the expansion valve in the floor. The line going in and out is hot. There is one bolt in the center and I hear they like to break. I replaced everything up front, pump, dryer, expansion valve, and the two thermistors. Right after that the bunk stopped, it probably got clogged up.
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