WHY? Engine temp runs cool in traffic, but overheats on highways?

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One other thing you might check. Admittedly I haven't read all your other threads so maybe you've already checked this. It's possible that the mechanical advance in your distributor is hanging up and causing it to run retarded at higher rpm. That can cause it to run warmer. Maybe pop the cap off and give the rotor a little twist. You should feel the resistance of the springs and it should snap back when released. If it doesn't, just clean and lube the pins and weights. It's a free fix that only takes a few minutes.
I still think the radiator is the main culprit.
 
Sorry, but that's not our job. When we (collectively) barge in and offer our varied in value advice, we are like Congress....we're good at spending YOUR money.


But you didn't answer this question yet.....do you have an anti-collapse spring installed in your lower radiator hose? Again, not saying this is your issue, I'm just curious.

Please see my post #14, I did answer as to whether the new lower radiator hose has a spring in it or not. It does NOT.

Here is my quote from # 14 to save you from scrolling backwards.............


I know my new lower radiator hose does NOT have a spring in it. It does seem to have the structural integrity built in but we never know.
 
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Sorry, but that's not our job. When we (collectively) barge in and offer our varied in value advice, we are like Congress....we're good at spending YOUR money.

We volunteer free advice to help YOU fix YOUR stuff. But it's up to you to decide whether you want first listen to any of our advice, find the root cause, decide on a fix plan, and then to spend $$, how much, and where, or if you want to farm it out or do it yourself. I get that you don't want to waste money and put it where it will get you the most bang for the buck, hell we all want that. Not saying these are your fixes, but if a new radiator and clutch ends up being what you need to fix your issues and it costs $400, then that's what it is. You wanna play, you gotta pay.

Case in point, without naming names, a 442 on here was dismantled to the ground, then rust repair was done by the owner and the project was labor intensive, but the body work was totally a work of art. More than I'd personally want to chew, for sure. Couldn't even say how much money/time/effort was poured into the project. Paint job was done and it was color sanded/buffed and looked absolutely awesome. I offered up a complete NOS set of 442 stripes and a header panel stand up emblem at a discounted price just so the car would look as factory as possible, at least cosmetically. Had the deal going, everything was packed up and ready to ship, just was waiting for the payment, then he backs out, saying he could get the factory stripes repro'ed for cheaper (that was some BS - haven't seen any correct repros of those stripes, have you?). So what happens? He puts one of those cheap no color backed gold stripe kits on it. And they weren't even put on correctly. IMO, it made the entire car look like dogshiit at that point. It was over for me. Hope he's still enjoying the car because it truly was a labor of love there. My point is, cheaping out after spending all that time and money to try and save a buck or two sometimes ruins the entire project. Ain't my car or my money, cuz you're the one that has to live with it. Just something to consider. There's some things you just can't be cheap with.

You could, say, find a reputable radiator shop locally, if you have one, that can inspect and maybe boil it out or repair, or what not and likely come out with a just like new radiator for less than a new one. Who knows. But again, that's your call. So far it seems you've been doing well into deciding your cash flows to the car. Don't worry about the costs just yet. Get to the root of the problem and then do your cost analysis to fix any problems. It could be simple, cheap, or even free to fix.

But you didn't answer this question yet.....do you have an anti-collapse spring installed in your lower radiator hose? Again, not saying this is your issue, I'm just curious.

I appreciate your post and guidance and we all do not have the pockets that others do. I wish, but could never afford a 1969 Hurst Olds, what I feel is the pinnacle FOR ME MIND YOU, of MY ultimate Muscle Car. I graduated in 1969, and my first muscle car was a 1969 442. The DNA is in my blood.

BUT.........I never have had nor will I ever have the disposable cash (and that is what this is all about) to BUY a 1969 Hurst Olds and then be able to restore it and maintain it. I own 1 of 2499 1979 HURST OLDS. You own 1 of less than 1000. Look at the differences in our cars. I totally understand putting the best on a 1969 Hurst Olds. It's an INVESTMENT. For me, this is about ME finally, finally owning a HURST OLDS before the good Lord calls me home. I can't date the prom quenn but maybe the ugly cheerleader.

People that know me are finally happy that I now own a HURST OLDS. Do I get the eye stares and thumbs up as I drove it yesterday for the first time?
No...........but letter the mail boxed hood of the 1969 Hurst Olds pull up and the stares almost permeate your head even if you don't look over.

I am thankful and grateful to people who can buy, afford, and maintain top shelf Muscle Cars. Someone forgot to put the MUSCLE in my 1979 Hurst Olds.
But my cousin who knows Linda Vaughn told me to send him the glove compartment door and he will get her to sign it. Will that make my 1979 worth anymore?

We are all at different stages of life and yes I understand as I watch owners throw $200K into a $100K car. That's not me.
I have a budget to get MY ugly cheerleader on the road, put on some miles and smiles and enjoy it the best I can.
I'd be silly to deplete my savings restoring a 1979 Hurst Olds spending 100K on 15K car.

I do not take offense by members posts, I just try to put my realistic expectations out there of what can be done, AT A REASONABLE COST.
Reasonable is my definition, not some one else's.

I'm not sure why my threads and posts seem to end up like this. More subjective than objective...........just my thoughts, No offense to anyone.

Thanks to all that post on my thread.
 
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Please, don't misinterpret my intentions. I wish you the best in making YOUR car YOUR car, no matter how much you decide to spend on it. They're your goals, and you have to fund it, so you make the calls. Nobody (here at least) will put you down for not opening your wallet and dumping all your money on your car. You have to get your priorities where you can live with them.

My main point of all my drivel was, if you are only looking at costs, it's hard to enjoy the car. Sometimes it takes a kind of expensive part to fix your car. We've all been there. But if you, or anyone else, can permanently fix the problem for $10 instead of $100, by all means, we all can benefit from that. It's just that most people here are trying to find the root cause without thinking of the price to fix. Anyone can throw money at a car. But throwing it in the right spots with minimal cash outlay is part of the fun. And also, part of the curse of classic car ownership.

If you can get Linda to sign your glovebox, don't pass up that chance. She is a true southern lady and she has a tremendous memory about what it was like doing all those events and people she's met along the way. If you ever get a chance to meet her, do it. She's a delight to talk to.

Sorry, I missed the part where you don't have a spring in the lower hose. May not need it if your hoses are still new and the walls are stiff, but if your hose is collapsing at highway speeds...
 
I vote plugged/dirty radiator also. happened to me in the GP. if the outside temp was cool, or at low speed/around town it was fine. Get it out on the highway on a reasonably warm day (80+) and it would heat up. Tried flushing, new fan clutch, thermostat... replace radiator and bingo.
 
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When you get your radiator fixed or replaced (likely cause), put a cheap spring in the lower hose (9 bucks). Take that out of the equation entirely. It's what it was used for in the first place. If you have a bad fan clutch, it likely would be stuck and be hard to turn by hand with the engine off. This is better than loosey goosey. Not great, but you can get by with that longer than a loose one. You can always put it on the radar to replace it later if you're having issues with it. It's obviously working good enough otherwise you'd overheat in town.

https://www.cjponyparts.com/lower-radiator-hose-spring-stainless-steel-big-block-1965-1973/p/HW770/

hw770_1.395.jpg
 
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I'm going with the lower rad hose collapsing at higher sustained RPMs on the Highway with the fresh water pump.

run the RPM's up to say 3k for a few and watch the lower rad hose for signs of collapsing, if good then the rad is clogged up
 
I'm going with the lower rad hose collapsing at higher sustained RPMs on the Highway with the fresh water pump.

run the RPM's up to say 3k for a few and watch the lower rad hose for signs of collapsing, if good then the rad is clogged up
I live alone and the dog's leg won't reach the pedal........but I'll find a way..........maybe call for an UBER and just use the driver for a few minutes and
send him off with a tip.........
 
First thing I would do is make sure you have a thermostatic fan clutch. Next thing is if you have a chevy v-8 you may have the wrong water pump. V-belt and serpentine belt have opposite rotations. Do not buy a cheap fan clutch
 
First thing I would do is make sure you have a thermostatic fan clutch. Next thing is if you have a chevy v-8 you may have the wrong water pump. V-belt and serpentine belt have opposite rotations. Do not buy a cheap fan clutch

I have the original OLds 350. And I always make sure to order parts for that Code R engine and when I take a part off, I verify it to be the same as I'm about to install.

Yes not all 350s are built the same.......I am learning that.........like I learned that a pontiac ditributor turns COUNTER CLOCKWISE after a lof of attempts after
a plug wire install. It pays to read the manual.................but who has time for that right????????? Come on.......you know who you are.🙂😊
 
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