160 degree thermostat for a 1968 DeVille
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 160 degree thermostat for a 1968 DeVille in Past Cadillac Vehicle Discussion; Anyone know where I can get a 160 degree thermostat for a 1968 DeVille? The norm was 180. It's too ...
  1. #1
    cadillacmike68's Avatar
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    160 degree thermostat for a 1968 DeVille

    Anyone know where I can get a 160 degree thermostat for a 1968 DeVille? The norm was 180. It's too hot down here and the car needs some help in backed up traffic.

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    purepearl32 is offline Cadillac Owners Member
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    Re: 160 degree thermostat for a 1968 DeVille

    Wasn't a 195 stat the normal temp for a 68? Maybe I am quite incorrect...

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    Re: 160 degree thermostat for a 1968 DeVille

    It was 180. Can't run without one, but i need it a bit cooler down here in the summer.

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    MoistCabbage's Avatar
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    Why? If it's getting too hot with an OE temp thermostat, the thermostat's not the problem.
    the APEMAN likes this.

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    wvcd is offline Cadillac Owners Member
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    Re: 160 degree thermostat for a 1968 DeVille

    Went into my local NAPA and they ordered a 160 degree stat for my 500. Had it in the next day.

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    Re: 160 degree thermostat for a 1968 DeVille

    Quote Originally Posted by MoistCabbage View Post
    Why? If it's getting too hot with an OE temp thermostat, the thermostat's not the problem.
    The problem is when I'm stuck in heavy traffic. It creeps. Manual says don't be concerned, but I AM concerned. I spent a lot of $$$ on this car and don't want the engine to overheat and kill the bearings. I lived in MA and there is no comparison in the summer. Asphalt gets over 125. The old cars cannot deal adequately with that when stuck in traffic.

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    Re: 160 degree thermostat for a 1968 DeVille

    If it's getting up to 195+, it should still get to the same max temp with any therm in hot weather.
    It may just take a few minutes longer to get up there with a lower temp therm.
    160, 180, 195 will run at that temp in cold weather or proper cooling conditions.
    Maybe your radiator is partially clogged.

    I put an aluminum Griffin in my BIG OLDS and that fixed it.


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    the APEMAN is offline Cadillac Owners Fanatic
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    Re: 160 degree thermostat for a 1968 DeVille

    I agree the rest of the cooling system may have a problem. Feel the air being pulled across the radiator by the fan. It should be almost painfully hot in hot weather conditions with engine at full temp. Check for volume AND temp of air.

    The large Cadillac engines are relatively (compared to other carmaker's big inch engines) easy to cool.

    I've run a 500 at idle for an hour with AC on in 100 degree NJ humid weather without any problems.

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    Re: 160 degree thermostat for a 1968 DeVille

    I have the original radiator tanks and am not changing them out.

    The rest of the system is fine.

    You guys anywhere else don't know how hot the road surface can get here in FL on a sunny day. It can easily get over 130-140 degrees with air temps over 115-120 in stopped traffic. That's HOT. And all that Hot air is being pulled past the condenser first, then the radiator with heat radiating up from the asphalt. Even in AZ & NM where it gets just as hot, that's Dry air, not this 95% humidity that we have in FL so that nothing cools unless a hurricane is blowing over it.

    Took the car for a 30 mile drive this evening, gauge never went over 1/4. Temp was around 90, but no sun load on the road, and no stuck traffic.

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    Re: 160 degree thermostat for a 1968 DeVille

    Quote Originally Posted by cadillacmike68 View Post
    I have the original radiator tanks and am not changing them out.
    So be it. Problem unsolved.
    Anything else before I go?

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    wvcd is offline Cadillac Owners Member
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    Re: 160 degree thermostat for a 1968 DeVille

    There are two radiator shops around here that can recore the original brass radiators.

    Is this not an option?

    What about a high flow water pump?

    Similar to http://www.summitracing.com/parts/br.../make/cadillac

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    Re: 160 degree thermostat for a 1968 DeVille

    I'm looking at the new design impeller water pumps. I have one as a spare or for the next time I replace the WP.

    The entire cooling system is is fine. I think I forgot to mention that my car was thoroughly overhauled in 2005, and only saw 2 real years of use since then, because of repeated deployments and body restoration. The radiator with the original tanks was re-cored in 2005 to a 4 core and I had it tested, rodded and cleaned in 2012 just before i went on my last deployment. The system does Not leak even when it gets real hot, because I have a 1969-70 overflow tank bolted to the passenger side wheel well. The fan clutch was replaced at the same time. I checked the coolant last week and it's still good.

    What else do we have except the stat, (which I cannot recall if it has that disc on the bottom that is needed on Cadillacs).

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    wvcd is offline Cadillac Owners Member
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    Re: 160 degree thermostat for a 1968 DeVille

    Cat or muffler plugged maybe?

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    carnut is offline Cadillac Owners Master
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    Re: 160 degree thermostat for a 1968 DeVille

    Because you added an overflow tank, it requires an overflow type radiator cap. One with 2 gaskets. If you are still using the early cap, maybe you're sucking air into the radiator instead of coolant from the tank? I presume this car has a fan shroud?

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    Re: 160 degree thermostat for a 1968 DeVille

    Quote Originally Posted by carnut View Post
    Because you added an overflow tank, it requires an overflow type radiator cap. One with 2 gaskets. If you are still using the early cap, maybe you're sucking air into the radiator instead of coolant from the tank? I presume this car has a fan shroud?
    I changed to the RC-27 cap on it when I got the overflow tank put on. Give me some credit guys.

    No cats on a 1968. Dual exhaust and neither side is blocked.

    Yes it has the fan shroud. All Climate Control equipped 1968s have it.

    Like I said, while its moving or when the weather is not unbearable, its fine. Its just when stuck in very heavy traffic - the kind where you have to wait for a light to cycle 4 times before you get to it - causing you to be essentially stopped for 15 minutes in 100+ temps (with actual air & surface temps over 120), that this problem arises. Even then, after I get moving again, it cools back down.

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