Jun 6, 2021 11:24 AM - 236 Views Create A New Thread

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Espanola, NM

High Temps
Own a 1937 Plymouth two door sedan I bought last year, the car has a 350 chevy engine and runs hot in city stop and go traffic.
The car has a Walker duel core radiator and fixed six blade fan, I am looking for advise as to what fellow hot rodders have done to lower temperatures, temps are fine on the highway.

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  • tazhog54
    Jun 11, 2021 at 11:25 AM

  • Glad your getting the problem solved !

  • martymtz
    Jun 10, 2021 at 12:19 PM

  • Update: I have corrected my cars high temperature by replacing the thermostat and also lowered the radiator 2 inches, as well as tilting the radiator to lean it towards the engine. The engine still sits at to much of an angle in relation to the radiator and shroud to have the fan blades at the right position at the top and bottom of the shroud, but lowering the radiator helped as the fan was 2 inches below the core and lower tank junction.

  • tazhog54
    Jun 7, 2021 at 11:31 AM

  • You answered your own question as your going down the highway and it runs cool . Then your thermostat isn't sticking . You have a a air flow problem at idle! Simple test at idle put a rag on the grill and it should hold, if not you air flow is not good enough to cool the engine! The best fix and easiest, would be a electric fan with a shroud from Cool Mate are the best out there ! Pretty must the rest are problems !

  • martymtz
    Jun 6, 2021 at 9:34 PM

  • Thank you all for your advice and comments. I am going to replace the thermostat first thing because I suspect it's not opening sometimes, no it has never puked, had the upper and lower tanks pulled and resoldered last summer due to previous bad work which caused leaks. The next thing I am going to do is lower the radiator as the current location is not correct and the fan extends below the radiator core, and will be tilting the radiator top back towards the engine as the space between the the top of the fan and the bottom of the fan to radiator is not the same.

  • jimmothershead
    Jun 6, 2021 at 8:16 PM

  • Marty
    Ditto,ditto, ditto, = NO PUSHER FAN !
    Has it ever puked ?
    What is the "hot" temp ? At stop light in Summer ? 60 MPH ?
    Stock engine ? Bored ? Compression ratio ?
    Where is timing set ?
    Are fan blades consistant in width or tapered crap ? Deep pitch ? Distance to radiator ?
    Good color in radiator fluid ? Correct 50-50?
    I am a believer in mechanical fans as long as there is proper clearance
    Jim, Hot Rod School O Hard Knocks since 1957
    410 535 1933, 410 535 1932

  • GeneF
    Jun 6, 2021 at 7:18 PM

  • I understand. Marty, I just wanted you to have the information, and the benefit of my hard knocks.


  • martymtz
    Jun 6, 2021 at 6:32 PM

  • I understand that pusher fans are not the way to go, puller fans are better, and I am just going to wire it up to the existing wires that are there for the fan that is already mounted on the condenser, it has a switch inside.

  • GeneF
    Jun 6, 2021 at 5:11 PM

  • Pusher fans are really a no-no... I had one of those too. I swear I am hard headed. LOL

  • GeneF
    Jun 6, 2021 at 5:09 PM

  • 36 Plymouth with the big block walker, and a Chevy 350 too.

    Two things: 1) The side panels really need to come off. Sorry to tell you that, but it's for the best. 2) scrap the fan. I tried the fan shroud, and it's a waste of time. The fan that will fit is just too small. If ya don't beleve me, I'll sell ya mine. It's what I call "new now junk". LOL Take the fan off, get a cooling components fan that has the shroud intigrated into it. Wire it up with a ground going back tot he battery, not the frame. Use the dakota digital system with relays 10 ga wire, and mount it in the cab away from the heat. Get the 2-speed slim unit. Put the sensor in the head, since that is what you are trying to keep cool. Left and right heads on Chevys have temp sensor ports, so just pull the plug out of the other side if need be. There is a reason why the 350 Chevys all left GM with the temp sensor on the head, not the intake...

    There is more. Ya gotta tear the radiator back out in order to do this. I did not, and I screwed up my first radiator. It's not with the risk.

    Sorry to be the bearer of bad news Marty.

  • martymtz
    Jun 6, 2021 at 1:22 PM

  • Yes it does, I took it off this morning for testing and car runs hotter without it, what are your thoughts on electric puller fans.

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