Join Date: Sep 2004
Location: Colchester, CT
Feedback Score: 0 reviews
Interior Cabin LOSS of HEATING "quick fix" check
Like it or not, we all are aware that these trucks like to "burp" radiator fluid every time the engine is under load and/or run hard (like a truck should be). As well, plowing snow will do it as well and these "loads", due to engine cooling system design, cause an overflow of radiator fluid; compounded already by the fluid being heated and seeming to "expand" somewhat due to the micro-bubbles of air (caused by cavitation) in the system.
This being said, the "design" of the cooling system is VERY unforgiving when it comes to the "proper" level of cooling fluid needed to "maintain" the system. Again, like it or not and by design, being as little as 1/2 quart low (yes, 1/2 quart, maybe even as little as 1/3) can and certainly will affect the systems ability to provide cabin heat when the truck is at normal idle rpm's (625 rpm).
You may certainly do all of the "modifications" with the PTO wire, idle control and everything else up to and including replacing the thermostat - all will help and may provide a "fix" to the low/no heat issue, but in reality .....
.... all that 9/10 trucks just need to have the radiator fluid "topped off" to where the "line" is (when engine is cold) just above the "minimum" fluid level indicator.
I keep mine at just below the "center" of the minimum/cold and maximum/hot levels and it takes care of the cabin heat issue every single time.
So, before you run out and replace your thermostat, before you flush your cooling system and before you perform all/any of the PTO/Wiring modifications .....
.... and you just want sufficient cabin heat ....
.... just "top off" your radiator fluid levels and see if that fixes your problem.
You can thank me later for the advice.
p.s. No, I'm not trying to sound ****y or am I trying to pick on anyone else for giving advice on these trucks, but hey ... I've had mine for eight years now and it's still running rock solid in all aspects.
PLEASE .... IF YOU DO THE ABOVE AND IT WORKED FOR YOU .... PLEASE POST YOUR RESULTS BACK ON THE FORUM SO THAT OTHERS MAY BENEFIT FROM YOUR EXPERIENCE.
Everyone gets the advice, gets their truck fixed, but most don't ever come back and give a follow-up on what & how really worked and that little bit of extra "after action" information is really helpful for others that may or will have the same problems in the future.
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