4.7L Dodge Ram 2007 4x2 FFV Quad Cab

Asked by Aug 29, 2016 at 12:20 PM about the 2007 Dodge Ram 1500 SLT

Question type: Maintenance & Repair

Info: As I have found little help on line I
will share for others seeking this.

Bought this excellent truck 4 months ago
so I am not family re with it. Problem
started about a month ago.

Issue: Overheating at low speeds, in
traffic and idleing. First only while air
was on, later with it off, and more and
more frequently. At highway speed it
would cool to normal. On the way to
normal you could watch the gauge water
transfer.

Went cheap route, changed thermastate.
The old one was bad as it only opened
when pot of water boiled, would not open
at 200 degrees, using digital cooking
thermometer. This did not fix the
problem.
Changed tempiture sensor. Still no
resolution.
I was going to change radiator. Tech at
AutoZone suggested it was more likely
water pump. I was skeptical but I decided
to do that first. AutoZone system
suggested changing fan clutch at same
time. Thought probably a good idea.
They have a kit with both for $95
After taking it off I seen no issues with
these parts, other than getting that clutch
off the pump to get the fan blade off.
What a job, but I found a method. First I
heated the nut and quick cooled it. Then I
estimated the hole location of the bell
housing between. I drilled two holes 3/8
inch from the inside of the aluminum
pump 180 degrees from each other. Put
6 inch bolts through the holes, through
the bell holes and nut them. Used 2- 15in
pipe wrenches, one on nut, one on bolt
hole on pump for leverage. Nut broke
easily then. Sounds like more work then
it was.
Took off thermostats flushed.all orange
anti freeze out of radiator, block through
pump and.hose that runs by burp plug,
with water hose.running in that radiator
hose ran truck with heater on make flush
out that radiator too. Not to long.as
alternator is not running. Used air hose in
pump block holes to.clear as much block
water as possible.
Put all.back together and put in GREEN
antifreeze concentrate 70% 30 water.
Tempiture gauge held steady for a week
two.needles lower than center.
Problem resolved.
Can't say if it was pump, clutch fan, or
that orange crap, maybe all three. All I
know is it is fixed and if your changing
the pump just do.the others.
Hope this helps others.

1 Answer

77,825

I have a suspicion that the fan clutch was bad, your symptoms were a classic fan clutch failure. I have heard of other having cooling problems with Dexcool, but have found out later that some of thier trouble was not servicing the system properly.

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