Re: {Chrysler 300} 413 with a/c thermostat

Should be a 180 degree thermostat with the regular green ethylene glycol; if you want a Napa part its #191. I normally drill a 1/8” hole in it but to each their own…

Hoses used to be softer rubber with a spring as John mentions. If the springs rust they can collapse especially at high rpm’s. Nowadays they use stiffer rubber that supposedly doesn’t collapse even with no spring, at temp. Bottom hose for the car depends on the radiator you have and its outlet diameter, but for Napa this will be 7648 for the smaller diameter or 745 for the larger.

Sent from my iPhone

On Sep 29, 2025, at 12:15, John Nowosacki <jsnowosacki@xxxxxxxxx> wrote:

And, if present, what is the condition of the spring? It could be extremely thin and eaten away to the point of no longer keeping the hose from collapsing, although I have been told in recent years that 'modern' bottom hoses are made of sterner stuff than in the 'old days', and therefore don't collapse anymore? I've not seen/heard of any parts stores carrying the spring to go along with the bottom hoses they sell.

On Mon, Sep 29, 2025 at 11:00 AM Robert Hayen <rbrthayen@xxxxxxxxx> wrote:
Does the bottom hose have a spring in it ?
A bottom hose will collapse/suck shut on high rpm without a spring
a soft bottom hose will do the same
Must have a 160 thermostat .

On Mon, Sep 29, 2025 at 9:00 AM dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx <dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Thermostats do not control the top temperature, they merely begin to open at the listed temp. A stuck thermostat can cause overheating, it would happen rather quick too. I would think a 180 degree stat is appropriate for our cars but I'll leave that to critique by those older and wiser.

Overheating at idle and low speeds is usually an air flow matter related to fan shroud placement, radiator support seal, fan blades properly distanced from core, or fan clutch.

Overheating at high speeds is usually water flow issues, collapsed hose, plugged radiator or rusted away pump impeller.

Danny Plotkin

-----Original Message-----
From: "David Dumais" <ddume300@xxxxxxxxx>
Sent: Monday, September 29, 2025 10:52am
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: {Chrysler 300} 413 with a/c thermostat

Hey All,
My second car has 413 with a/c

It has a 195 thermostat and runs up to 250*

Should I install a 160?

Dave

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