Author Topic: 440+ 6 Temperature spike when stopped...even for a short time.  (Read 2487 times)

Offline Tazinhawaii

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #30 on: June 21, 2017 - 09:14:47 am »
Air bubble in system or Tstat is not opening.  I know you said its new, but...........

 :iagree:  I had the exact same thing happening to me a few months ago when I changed out the radiator.  Everytime I would stop at a light the temp would scream up and come right back down when I started going again.  Did it for a day or two and then went away.  I attributed it to an air bubble in the heads (also changed heads).  Ran cool after that until my unrelated current issues happened.

Derrick
1971 Cuda 440 six pack.  Original TX9 Black on Black.  Located in southern NH.




Offline Travis Blake

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #31 on: June 21, 2017 - 10:18:51 am »
:iagree:  I had the exact same thing happening to me a few months ago when I changed out the radiator.  Everytime I would stop at a light the temp would scream up and come right back down when I started going again.  Did it for a day or two and then went away.  I attributed it to an air bubble in the heads (also changed heads).  Ran cool after that until my unrelated current issues happened.

Derrick

With the top hose being pliable, I'm wondering if I do have air in there. Before we changed it, I remember the top hose being firm with the engine is hot. Can anyone confirm if it should be pliable or firm, and what that indicates?
1974 Dodge Challenger  - 440 Six Pack
2015 Jeep Wrangler Unlimited - Willy's Edition

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #32 on: June 21, 2017 - 12:52:15 pm »
Tsat upside down?
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"


Offline 73440

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #33 on: June 21, 2017 - 02:15:04 pm »
Hose should be firm after thermstat opens,
Almost like the water pump is not turnng inside the housing.

Had a concrete pump hose clog due to a flap of the inside rubber of the hose folded down against the flow and plugged the line.
67 440
73 Barracuda w/ 68 440
65 Plymouth Fury III , I sold ,was my Nana's car till 92 yo.
51 Ford F1 239 Flathead, flipped , new cab , stolen
59 BelAir 283 4 door original patina
01 Chevy van 382,031 miles
06 Crown Vic Police Interceptor
75 HD Ironhead converted to RH shift
73 HD Ironhead
82 HD Ironhead
74 Norton 850
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80 Husqvarna WR 390

Offline polarbear123

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #34 on: June 21, 2017 - 02:26:09 pm »
I had the same problem when I sat at red lights. I ended up getting a Milodon high volume water pump.

Offline Travis Blake

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #35 on: June 21, 2017 - 02:44:37 pm »
I had the same problem when I sat at red lights. I ended up getting a Milodon high volume water pump.


Did that fix it for you?

That's what I've been hearing from people. Milondon makes the Tstat that's in there...they seem to have a pretty good reputation. I'll start there...there is just no reason why the motor should be that hot, when the radiator is at 140....water must not be getting circulated somehow.

The one thing I'm worried about is that I had a shop flush it about a year ago when it was running hot, and they said a TON of goop came out. When this radiator went in nothing came out that wasn't green coolant. Would pulling the back freeze plugs reveal build up, as I believe that is the lowest point in the motor.

1974 Dodge Challenger  - 440 Six Pack
2015 Jeep Wrangler Unlimited - Willy's Edition

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #36 on: June 21, 2017 - 03:32:19 pm »
may want to put in a flushing chemical once, and running engine,
before doing water pump replacement, to see what get out?
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline Travis Blake

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #37 on: June 21, 2017 - 05:54:37 pm »
may want to put in a flushing chemical once, and running engine,
before doing water pump replacement, to see what get out?

I would agree. Good idea.
1974 Dodge Challenger  - 440 Six Pack
2015 Jeep Wrangler Unlimited - Willy's Edition

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #38 on: June 21, 2017 - 06:24:08 pm »
I would agree. Good idea.

and to get all old coolant out, there is a block drain on each side of block, above
oil pan.  Before putting in new Thermostat in, drill a small 1/8 inch hole in it, so that when filling
engine, air will not be trapped below Tstat.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #39 on: June 21, 2017 - 06:28:57 pm »
assume you have a quality lower hose that is not collapsing when driving?
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #40 on: June 21, 2017 - 06:41:24 pm »
I would agree. Good idea.

keep flushing till water clean. But of course, you
have to keep an eye on engine temp.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline 734406pk

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #41 on: June 21, 2017 - 10:53:18 pm »
One easy way to vent air from the cooling system is to drill a small hole (1/16"+ -) through the flat area on the thermostat. This will allow small air bubbles to bypass the thermostat while it is closed. Some thermostats incorporate this air bleed feature in design, labeled as a "jiggle wire" type, which closes the bleeder at high flow.

Since you already have an IR heat gun, i would check the temp at the top of the radiator, right at the location of the upper hose location and compare the temp reading at the same area near the lower hose. This temp differential will determine your radiator/fan efficiency in heat rejection. Test this when you are at op temp or a little above. Work safe!
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #42 on: June 22, 2017 - 01:58:22 am »
Impellar may be just spinning loosely on pump shaft,
as if a key came out or something. Have read that actual
coolant temp in head is about 15 degrees hotter than water
going to the radiator.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline polarbear123

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #43 on: June 22, 2017 - 10:05:49 am »
This stuff works.

Offline cudabob496

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Re: 440+ 6 Temperature spike when stopped...even for a short time.
« Reply #44 on: June 22, 2017 - 02:52:51 pm »
ya, there's a way to fill system, then run engine without rad cap,
until all the air bubbles out
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"