Re: Overheating Stumped...

["Dennis C." <dennis.2914@xxxxxxxxx>]

Last comments:

A 4-row may not have increased cooling much but it should not have
hurt it however if you have another 3-row you can put back in it would
be an easy test.

With your 4-row and your IR thermometer check the temperature at the
top tank and bottom where the outlet is when it is running and trying
to overheat.

If you get a BIG difference in temperature I would suspect the water
pump is not moving enough water at low speed.  Hard to believe but
possible.  A change in water pumps is easy and not expensive.

If you get the same or near the same reading top and bottom it will
tell you that for some reason the radiator is not cooling the water.
Radiator problem or air flow problem.

I will check my stock 318 with stock fan today and see what readings I
get.  I run OK on the road but stopped in town or driving through a
fast food joint temperature goes up to the top of the safe zone on the
dash temp gauge.  This is with 105+ temperatures.

Good Luck
Dennis C.

On Aug 13, 10:32 am, Bill M <y1topbanan...@xxxxxxxxx> wrote:
> So I'm trying to diagnose the issue that's causing my new 4-core
> radiator to make the car run hotter than with my previous 3-core
> radiator. Not only does it run hotter at cruising, but it starts
> getting hot IMMEDIATELY upon stopping at a light to the point of being
> scary.
>
> Basically the only thing I changed id the radiator. Car is 318 Poly
> with a mild cam, 7 blade fan, fan clutch (confirmed working), no
> shroud (never had one), now new 180 deg high-flow t-stat, spring in
> lower hose.
>
> The symptom I cant figure out now is...after testing things today and
> keeping an eye on temps w/ a laser thermometer, I turned it off to let
> it cool and scratch my head. When the rad, and upper hose had cooled
> to ~165, the lower rad hose was dead cold. I pulled it off and there
> is no restriction in the hose or the pump. I looked in the water pump
> from below and don't see anything up there either. It's not leaking
>
> Any thoughts??
>
> Bill M
> 65 Coronet 500 'verthttp://1962to1965mopar.ornocar.com/mmo62008.html
> 73 Dart Sport, 00 Cherokee Sport, 05 Ram 2500 CTD, 4WD, QC, LB, Laramie
> 21 Model T Depot Hack, 92 Accord, 06 Mazda 3

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