66 Belvedere II Hemi - overheating?
#1456766
06/22/13 09:58 PM
06/22/13 09:58 PM
|
Joined: Nov 2010
Posts: 331
Northeast
edl
OP
enthusiast
|
OP
enthusiast
Joined: Nov 2010
Posts: 331
Northeast
|
i have dummy gauges - the temp gauge is like this |_____| with a similar trough inside of it - the outside walls are the max/min - the walls of the inside trough mark the range of "normal" when i am driving in traffic, car runs in the middle of the normal trough - but, when i open her up on the highway for an extended period, i am just about to the outside wall of the normal trough Questions: - if i am at the outside wall of the normal trough, is that considered "overheated" - what temp does that equate to? - why would i runner hotter at speed (with considerable more airflow through the radiator) than in stop and go? ... seems counter-intuitive thanks! 
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: RapidRobert]
#1456768
06/22/13 11:16 PM
06/22/13 11:16 PM
|
Joined: Jan 2004
Posts: 1,468
N.Y.
sixpacksteve
pro stock
|
pro stock
Joined: Jan 2004
Posts: 1,468
N.Y.
|
its not stock, but get an after market Real gauge to stay on the safe side. makes for good insurance!
Hell Hath No Fury Like Mine
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: RapidRobert]
#1456769
06/23/13 12:06 AM
06/23/13 12:06 AM
|
Joined: Jul 2005
Posts: 3,072
Farmland, IN
Ludington1
master
|
master
Joined: Jul 2005
Posts: 3,072
Farmland, IN
|
Quote:
lower hose partly collapsing (fairly common).
There's my bet, check the spring in the lower hose.
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: edl]
#1456770
06/23/13 02:57 AM
06/23/13 02:57 AM
|
Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
|
master
Joined: Mar 2003
Posts: 4,848
Memphis
|
No its not overheating until coolant comes out the overflow because its boiling. Your just getting warmer than the thermostat temp. Any of the above causes mentioned could be the problem.
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: HemiRick]
#1456771
06/23/13 07:01 PM
06/23/13 07:01 PM
|
Joined: Nov 2010
Posts: 331
Northeast
edl
OP
enthusiast
|
OP
enthusiast
Joined: Nov 2010
Posts: 331
Northeast
|
Quote:
No its not overheating until coolant comes out the overflow because its boiling. Your just getting warmer than the thermostat temp. Any of the above causes mentioned could be the problem.
HemiRick - thanks...that is good news to know that i am not overheating the engine...that is the last thing i would want to do
is there any downside to just letting it run hot if it is not in fact overheating? - that is not my intention, but just want to know if i should stop driving till i root cause this and fix it?
on the root cause:
1. i'll start with the lower hose - when folks say to check the spring...i assume this means a spring that is in the wall of the hose that keeps it from collapsing? - or is it something else?
2. on a thermostat, how would i know if it is bad? - is is just something to change just in case...as preventive maintenance?
3. on the rad being plugged, i'll purge it...having said that, i have never done that before...is it a question of just letting it drain, filling and draining? - how many times? - any cleaner to flush through it?
thanks!
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: edl]
#1456775
06/23/13 10:21 PM
06/23/13 10:21 PM
|
Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
|
master
Joined: Mar 2003
Posts: 4,848
Memphis
|
There should a metal spring inside the lower hose. Either its there or its not.
The thermostat is merely a min temp maintaining device. it opens above its rated temp to allow coolant to flow. The only way they can fail is to NOT open at all or stay open all the time.
the only thing you can do to unplug a clogged radiator is to run some kind acidic rad flush cleaner thru it. Or take it a rad. shop and have them rod it. this is where they pass metal rods thru the tubes to clean them.
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: HemiRick]
#1456776
06/23/13 10:32 PM
06/23/13 10:32 PM
|
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
HemiRick had a good point in his first post which I missed which is how hot is it rather than just the bar gauge being on the far side. If it is actually running way too hot (1) go to your welding shop & ask them for a length of stainless steel welding rod then form it around a broomstick then turn the end(s) inward toward the center so it wont puncture the hose then spiral it into the lower hose. (2) take the stat out & take it back out on the road & see if there's a change. Having the stat out for an hour wont hurt anything. (3) If the rad is partly plugged it would need a boil out at a minimum & maybe a rodding out which can be hard on weakened core tubes & cause a leak over time & is somewhat expensive. The EPA may have even stopped hot tank usage. If I had any doubt I'd get a good new 3 core rad. My Chanpion works great & was inexpensive.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: edl]
#1456779
06/24/13 12:22 AM
06/24/13 12:22 AM
|
Joined: Jan 2003
Posts: 18,427
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 18,427
UPPER MICHIGAN, MARQUETTE COUN...
|
Quote:
Questions:
- if i am at the outside wall of the normal trough, is that considered "overheated" - what temp does that equate to?
- why would i runner hotter at speed (with considerable more airflow through the radiator) than in stop and go? ... seems counter-intuitive
You have a big motor that makes power, power makes heat. We fought this all the time on police cars. Its not about air flow anymore. Its about the systems ability to cool and they were marginal at best. You need to be sure there are no slipping belts, correct shroud and fan to radiator clearance. No flex fans and if its clutched make sure its working right. As said you can add a mechanical gauge to verify what your electric one is doing. I also like to add a recovery bottle and radiator cap to support the recovery system. A good flush and 50/50 mix would also be in order. If that does not work find a shop that can rod your core and if the core is poor re-core your original. Don't settle for ultra sonic cleaning, It does not do the job.
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: NITROUSN]
#1456780
06/24/13 10:16 AM
06/24/13 10:16 AM
|
Joined: Nov 2010
Posts: 331
Northeast
edl
OP
enthusiast
|
OP
enthusiast
Joined: Nov 2010
Posts: 331
Northeast
|
|
|
|
Re: 66 Belvedere II Hemi - overheating?
[Re: edl]
#1456781
06/24/13 11:17 AM
06/24/13 11:17 AM
|
Joined: Jun 2006
Posts: 5,167
CT
GTX MATT
master
|
master
Joined: Jun 2006
Posts: 5,167
CT
|
Also, not mentioned above, are you running vacuum advance? If not this may help.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
|
|
|
|
|
