PTO/Hydraulic Pump

[cmillsap]

AhHa, The 'ole PWM valve. I replaced it on my other LXi and also on my present bus. I bought it from Berendsen but if I recall correctly, it took a while to get it as the factory had to build it because they didn't carry it in inventory anymore. I hope they still make them??

Al should use a laser tachometer to check his fan speeds before buying a PWM valve. Also, everyone should be aware that switching the chassis a/c on will also switch the fan to a higher speed depending again on the engine RPMs. So check the fan speeds with the A/C turned off to get accurate PWM valve performance.

David's description in post #15 above is exactly how the fan controls work on my bus. But when using the dash A/C my bus's cooling system will normally run at 2 to 3 degrees just above the 185 *F thermostats.