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Old 03-19-2017, 01:46 PM   #1
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'98 Spartan/Newmar Chassis Cooling Fan

Recently we took a trip over our local pass into Central Oregon during the summer months and on the way up the steep side, The over heat alarm sounded. We had just had everything serviced, etc. I opened the engine hatch in the back and noticed the fan was not spinning very fast. I know this is a hydraulic driven fan, but what drives it? I was told the power steering pump does. The fluids were all the correct level in the big can reservoir on right side rear. We shut her off and let it cool down after I also discovered the Transmission was a gallon low. We pulled the cycle out of the trailer and rode back 20 miles to Oakridge and got ATF. And after adding it to the transmission. and starting the rig up the fan roared like a lion and off we went. On the way home, starting up the other side of the pass after a weeks stay, it over heated again. And again the fan wasnt running where it should be speed wise. I nursed it over the top and once we cooled off, it again roared to life. What am I missing? A fellow diesel pusher owner said I needed to rebuild the PS pump. Weve only had the rig a short while and there isnt much on the way of documentation for the chassis.
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Old 03-20-2017, 04:25 AM   #2
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Originally Posted by anbrusten View Post
Recently we took a trip over our local pass into Central Oregon during the summer months and on the way up the steep side, The over heat alarm sounded. We had just had everything serviced, etc. I opened the engine hatch in the back and noticed the fan was not spinning very fast. I know this is a hydraulic driven fan, but what drives it? I was told the power steering pump does. The fluids were all the correct level in the big can reservoir on right side rear. We shut her off and let it cool down after I also discovered the Transmission was a gallon low. We pulled the cycle out of the trailer and rode back 20 miles to Oakridge and got ATF. And after adding it to the transmission. and starting the rig up the fan roared like a lion and off we went. On the way home, starting up the other side of the pass after a weeks stay, it over heated again. And again the fan wasnt running where it should be speed wise. I nursed it over the top and once we cooled off, it again roared to life. What am I missing? A fellow diesel pusher owner said I needed to rebuild the PS pump. Weve only had the rig a short while and there isnt much on the way of documentation for the chassis.
The transmission fluid level will not affect the fan, it is operated off the hydraulic system and it has its own hydraulic tank with a dip stick on top. Did you check the fluid level in it? This hydraulic system operates the power steering and your fan drive motor,and this hydraulic pump is mounted on the back side of the air compressor and this is all mounted on the engine, and is driven by the cam gear. There is also a Priority Valve on the fan side of this system(At least on mine) to adjust the fan speed.
On the right side of this photo you will see the coolant overflow tank(White tank) and in back of it you can see a large black tank, that is the hydraulic tank, and it has 3 stacked filter's in it.
Also, given the year of your Coach, has the CAC (Charge air cooler) and the radiator ever been pulled and cleaned?
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Old 03-22-2017, 07:44 PM   #3
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No CAC in here, and the radiator was checked and blown our regularly. No significant buildup in the internal tubes either. I had suspicions its the hyd pump on the engine. I will again check the level. I just couldnt find any info on it as to the level requirements and servicing. Also I have not found a priority valve. It just slowed way down and then later took off like a airplane. so there is something affecting it. No discernible difference on the operation of the steering
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Old 03-25-2017, 04:31 PM   #4
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I am not saying there isn't something wrong with the fan control system, there could be.

You also mention only having the rig a short time. Do you downshift manually on large grades. If you just put the throttle down and wait for the transmission to shift you are probably waiting too late. If you use the shift pad and downshift early enough it helps keep the engine/transmission temperatures down

thx Dale
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Old 03-25-2017, 11:18 PM   #5
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The priority ralve is mounted on the chasis frame rail behind the drivers rear tire. It is in a silver box about 6inx4in. You would not have power steering if the pump, that is attached to the air compressor on the motor broke.
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Old 03-25-2017, 11:22 PM   #6
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Sounds like it is the pressure regulator valve. There is two valve in the box 160 through Spartan. Just ordered some the other week. Then Ryder fleet products has the reseviour filter for 30. Napa had a sale on fluid for t gallons was 85 bucks... you should be good there... I had to replace the pump... 😡
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Old 03-25-2017, 11:23 PM   #7
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Send me a message if you have any questions can walk you through whole process if you need
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Old 03-27-2017, 08:02 PM   #8
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Sounds like it is the pressure regulator valve. There is two valve in the box 160 through Spartan. Just ordered some the other week. Then Ryder fleet products has the reseviour filter for 30. Napa had a sale on fluid for t gallons was 85 bucks... you should be good there... I had to replace the pump... 😡
had not thought about the valve just being bad, wonder how you could test it when it works most of the time
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Old 03-27-2017, 08:04 PM   #9
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I am not saying there isn't something wrong with the fan control system, there could be.

You also mention only having the rig a short time. Do you downshift manually on large grades. If you just put the throttle down and wait for the transmission to shift you are probably waiting too late. If you use the shift pad and downshift early enough it helps keep the engine/transmission temperatures down

thx Dale
I have driven truck, yes I do down shift the trans manually, it saves on heating up the brakes so much, no sense just standing on them for 30 miles doing down steep grades
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Old 03-27-2017, 08:25 PM   #10
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Per the OP's PM to me, here are the photo's I mentioned......

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Old 03-28-2017, 11:32 AM   #11
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Might need a little cleaning... :-)
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