RE: {Chrysler 300} Re: 300G Thermostat

John,

You mentioned the pollution control valve, ‘61 was the first year for the PCV, for cars sold in California only. About 15 years ago I was given an original ’61 PCV from a local Chrysler friend that has since passed away. My G was sold new in New York and didn’t come with the PCV, so I installed it on my G. I like it and would not go back to the old draft tube. With the draft tube, when I worked on the engine while running, I would notice emissions coming from the tube, now there are zero emissions in the engine compartment. Gone also are the crankcase vapors that would occasionally drop out the tube onto the floor. Draft tubes only work when the car is in motion, when a partial vacuum is created at the base of the tube, sucking out crankcase gasses. Now, even at idle sitting still, like at a stoplight, nothing comes out.

Bob J

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of John Grady
Sent: Sunday, February 4, 2024 6:21 AM
To: Charlie V <cv300g@xxxxxxxxx>
Cc: chrysler 300 club <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Re: 300G Thermostat

I used to think the same way , 160 just less stress on everything , then read that the higher temp evaporates water and contaminants a whole lot better out the vent system .

While on that, PCV is an excellent upgrade if you don’t have . Hot heads sells a kit , I think california had it oem factory . Grommet fits in hemi draft tube hole , probably other valley covers too

It adds nothing to “ max cooling capacity “to run colder thermostat as once open it is always the radiator condition setting that no matter the thermostat . .. it is open

To keep engine , oil and interior rust free ,and condensation out , higher temps work much better . Especially if PCV exchanges air . Draft tube = a lot more sludge in long run .

But 195 might lead to a constant low positive pressure in cooling system ( normal with that 195 thermostat , as water may boil locally at hot spots inside) , but condenses nearby into water again , no steam at radiator but some pressure can show inside . Why if you fill radiators to top it will puke out a pint or more then be stable . Radiator cap psi is another big issue in this . High temp may need 12-15 psi cap .

Sounds like middle of road is best but 195 is even better for engine if all is in perfectly good shape

Heater core and especially that ranco heater valve is a good reason to not go 195 .

I don’t know about my other club members but that valve stem seal failed twice on me in past it blows a gallon of hot antifreeze all over your front rugs from behind glove box.

I don’t really need that .

To me the thing is a sad joke anyway . on some cars I have used 78 dodge truck on off valve in hose ( used in many mopars) same push wire . Drill hole for it . That puts the valve under the hood , gives you heat instantly when you want it . Block off holes where ranco was , plate from inside .

I know “ original” and all that . Brings “ original “ problems too !

Sent from my iPhone

On Feb 3, 2024, at 6:12 PM, 'Charlie V' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Thank you very much and I agree that I will get several different replies/opinions.

Charlie

On Saturday, February 3, 2024 at 06:10:44 PM EST, ridgleyracing65 <ridgleyracing65@xxxxxxxxx> wrote:

Everybody will have different opinions and I will share mine. I use 160 degree units in all my classic cars.

1. I don't drive them in the winter, so I don't need a lot of heat from the heater.

2. The lower temps are easier on all the cooling system components; radiator, heater core, hoses, and internal engine gaskets.

3. A 160 degree thermostat provides some extra cooling capacity when the car encounters periods of slow traffic or high ambient temps.

Just one person's opinion,

Dyke Ridgley
On Saturday, February 3, 2024 at 4:27:24 PM UTC-6 Charlie V wrote:
Hi everyone,
What's the recommended thermostat for the 300G ?

I looked in the Service Manual and the 300G Service Manual Supplement and could not find what degree mentioned.

I looked in the parts manual and they have a 160 and a 180 degree.

I looked on RockAuto and they have a 160, 180 and a 195 degree listed.

By the Parts Manual, I would think 180 is correct but I swear someone told me to use a 195.

Bye for now and Spring will soon be here. I had the G out for a ride two times today.

Charlie Valentine

.

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