2007 Holiday Rambler 40skq - How To Clean Rear Radiator Fins
Recently I posted for another issue and happened to mention that I got a Stop Eng light when going up hill when really hot out. I checked diagnostic code and it was for Coolant Temp. There was recent radiator work done by the previous owner right before I purchased and I found the coolant level to be low. I found it about 1.5 gallons low so I added and again got the light on the next trip when going uphill. A kind person in that thread let me know the radiator does need to have the fins cleaned annually since it is a rear radiator. I'm researching on how to do this and have come up with a bunch of questions. If there is not already a post on how to do this I will make one. Questions:
1. Per the picture below and from what I can tell the CAC is the black section on the bottom and the radiator is on the top. That silver section is about 4 or 5 inches deep and from the engine side I see the same thing. Silver section on top and black section on the bottom.
2. I did find that on the engine side there is a bunch of gunk in there and it really does need to be cleaned. From what I can tell you should spray from the rear towards the engine so you don't try passing all the gunk through the fins. Is that right?
3. How does the water and gunk drain out of the fan housing? I noticed on the bottom it is all sealed up. I saw in a post where a guy drilled like 1/2 inch hold in the bottom of the housing for drainage. Is this recommended? Is there a better way?
4. There seem to be two good cleaning solutions for this procedure that I have found. The super duper Dawn de-greaser and Extreme Simple Green. Does this sound right?
5. Is there a post that already tells me all this and describes the best way to clean this rear radiator and CAC? The engine is a Cummins ISL03 400.
Thanks in advance.
2007 Holiday Rambler Endeavor - 40skq
40' Diesel Pusher