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Old 05-20-2017, 04:46 PM   #29
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Ok with the help from here and a little diagnosing I think:
Radiator gunked up from 3 yrs of sitting
Or
There is one bad thermostat bc it does open and flow but maybe it is just opening one of the thermostats causing decreased flow through the radiator.
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Old 05-20-2017, 04:52 PM   #30
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Once it gets dark outside, have a helper shine a flashlight into radiator while you look at other side....
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Old 05-20-2017, 06:36 PM   #31
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Very smart....
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Old 05-20-2017, 10:12 PM   #32
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So did the flash light test and I don't know how much light is suppose . To come through but it was definitely coming through
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Old 05-20-2017, 10:13 PM   #33
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On all areas of the radiator... even corners...
Thoughts tend to lead toward the thermostats again as the culrip....
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Old 05-21-2017, 06:47 AM   #34
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Just ran it for about 30 minutes and then took it for a drive...
Initial idle and warm up engine rose to temp of 181 and then maintained for 10 or 15 minutes.
Took it out for drive and again at stop lights and long idle (getting it back into drives) it wanted to raise temps to 200-210 before I fed it some rpms and cooked back down. 1000 rpm for 35 seconds got it back cool

Temps (infered gun on plastic joints)
Input to radiator 156 degrees
Output was same at idle speed.
Temp of dash gauge was 210.
It seems as if your gauge is not working properly, maybe the temperature sending unit?
Take another reading on the upper and lower radiator hose's when your dash gauge is reading 210 deg. and see what the temperature's are. You ought to be able to shoot the thermostat housing.
If at operating temperature, the thermostat housing should be at the temp of the thermostat, around 180.
Also, take a 1/2" breaker bar and take the tension off the water pump pulley(Belt tensioner) and spin it, rotate it and make sure it is smooth.
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Old 05-21-2017, 12:31 PM   #35
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Does your coach have a fan controller?

https://xa.yimg.com/df/Country-Coach...&type=download

If so, test procedures,

https://xa.yimg.com/df/Country-Coach...&type=download

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Old 05-21-2017, 03:29 PM   #36
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Tried to follow the link and could not. I am not sure....
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Old 05-21-2017, 07:53 PM   #37
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Let's try again,

https://xa.yimg.com/df/Country-Coach...&type=download


https://xa.yimg.com/df/Country-Coach...&type=download
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Old 05-22-2017, 10:09 AM   #38
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Called spartan and gave them the vin number and asked if there was one on my coach and negative...

Took the belt off and the water pump spun freely...
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Old 05-22-2017, 10:41 AM   #39
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If no fan controller, do you have a wax valve system? What controls your fan speed. Just trying to learn.

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Old 05-22-2017, 03:04 PM   #40
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So what I have is an engine based rpm controlled hydrastatic fan to cool all three radiators...

But I believe I found the culprit... So a few months ago I had to change the hydraulic pump that controls this fan and the power steering box. This fan is supposed to maintain an rpm of 250 or so at idle. Mine does not spin and if it does very little... I am assuming the fan took some damage and is not sealed tightly enough inside the maintain rpm at low engine rpm. Raise idle to 600 in neutral and idle for about 30 minutes no issues....
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Old 05-22-2017, 03:13 PM   #41
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You might just have what is called a "Priority Valve" mounted on the Chassis, on it there is a valve sticking down with a screw cap on it, the cap has a o-ring on it, and up inside is a needle valve,that takes a allen wrench, and you can adjust the valve to direct more or less hydraulic pressure to the fan motor or the steering system.
Follow the hose's from the fan drive and see if they lead to this Priority Valve.
If so, you can turn the needle valve counter clockwise to let more pressure go to the fan motor thus speeding the rpm's of the fan up.
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Old 05-22-2017, 03:17 PM   #42
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Quote:
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If no fan controller, do you have a wax valve system? What controls your fan speed. Just trying to learn.

Bill
Hello Bill, on these Chassis, the fan motor are direct drive off the the hydraulic pressure from the pump, along with the steering.........and inline is a Priority Valve that is adjustable to speed up or slow the fan rpm's.
So, the more engine rpm's, the faster the fan turns.
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