Here in Australia I put it down to penny pinching by Chrysler. My 71 Valiant with 318 and A/C had a fixed 7 blade fan but the top of the line Chrysler by Chrysler with 360 got a fan clutch and surround. I hated the fixed blade as it pulled so much air the belt would slip over 4000 rpm and you would get watery eyes trying to do a tune up. Swapped over to the clutch set up from a Chrysler I wrecked and air throughput at idle dropped making working under the hood more pleasant but never had an overheating problem even with air con on. So both did the job but the clutch setup was obviously more expensive. Put the plastic surround on but broke it when an engine mount snapped doing a burn out. Didn’t matter when I threw it away. It still had the biggest radiator available anyhow. Henry From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of John Grady
Sent: Tuesday, 7 May 2024 2:48 AM
To: dave mason
Cc: kboonstra@xxxxxxxxxxxx; Steve; chrysler 300 club
Subject: Re: {Chrysler 300} 300 F Engine overheating That is a really interesting statement, Keith .. I may not have noticed despite so many years ,which cars have fan clutch and which don't ---but I believe the fan clutch also has a more aggressive fan, so more cooling at low RPM would be the end result, the reason for doing it--(traffic) Ram cars do not like running hot at low speed , AC or not. Idle gets flaky etc...Implied in that is that a solid mount fan is not as effective at low RPM? maybe fewer blades Do we know if non AC ram F did not have a clutch? or option? Gets into a 4 row radiator the best thing of all, and all the 413 water pump changes . There had to have been some issues around all this? never been into the history of the car options personally ,but I know others are very into that. Maybe someone knows what was really done or offered on fan clutch/radiator packages? HD packages?? Sorry for assuming all have a fan clutch...and that this one has. I do know an electric pusher fan about 12" diameter cannot cool a 440 at idle....so this must all be close... Unless the direct fan is installed with a spacer. I’m glad you mentioned this Keith because I was going to ask folks, why a non a/c F has a clutch in the first place, as opposed to non letter 413 cars that just have a solid direct fan with a spacer? Because cross ram cars could generate more heat? I got a message from Steve this morning that I can’t find right now. Steve said that he has no fan clutch in place, just a direct mount of the fan on the water pump. So the fan is running at full speed and this is not a fan clutch problem. However, without a fan clutch taking up space between the engine and the radiator, I’m going to guess that the problem is that the fan is now too far back from the radiator to be effectively pulling air through it. probably fan clutch , they go … hard to tell decisively too have to watch “ new water pump “ as they sell you a 440 pump now. There are variations in 413 pumps i never got to the bottom of myself . But got bit once . Some early block front covers had metal flow directors inside behind pump others did not , add in AC or not , and i believe due to this plate the pumps changed in how far they reach into cavity . . if you put a 440 pump in you can end up with a space behind impeller and it pumps very poorly . I did not measure any of this at the time but someone may know . Confusing and erroneous data out there on this . discussions with parts guys can get heated all they know is numbers , it is a 440 pump you get unless a part lookup from 1960 but even that crosses in computer to440 pump . Which might work depending on details of front cover cavity There are articles about adapting i think it was JAG fan clutch too . , as the clutches vary in thickness . tech site has info on that . Sometimes parts get mixed over 60 years wrong blades etc etc personally if building new i’d look at modern aluminum 440 covers and pump , at least you kniw they go together , and pump fully evolved john Hello again from Delaware,Ohio. 2 weeks ago drove it 50 miles. Brought it in and it was super hot. Put a new thermostat in and temp guage was in the middle. Flushed engine today 3 times and new antifreeze. Drove it 50 miles, temp outside 70. Brought it in and radiator was gurgling and super hot and upper radiator hose was not the usual stuff hose. Was steaming a little. Had radiator done within 5 years and new water pump also Infrared temp at radiator cap 200, and engine 240. Got a week to figure it out or a big no on driving to kokomo. Got a new water pump ready to go? Sent from my Verizon, Samsung Galaxy smartphone
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