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| still overheating and being weird (Page 6/16) |
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82-T/A [At Work]
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JUL 11, 08:37 AM
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| quote | Originally posted by cartercarbaficionado:
yeah that's the thing. I had already done that and taken it to a reputable radiator shop to have it boiled out and flow tested. also did clean the fins out multiple times now and it's still not right. I think a few of my cores just aren't correctly working as of a few days ago when the temp shot up slightly above normal and stayed there. also as it turns out the new temp sensor I bought to replace the questionable one doesn't work at all |
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Hmm... and you know the timing is right (car runs awesome otherwise), the cooling tubes are not kinked, and the waterpump is good? The only thing at that point I can think of is that it has to be the radiator at that point.
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cartercarbaficionado
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JUL 11, 05:34 PM
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| quote | Originally posted by 82-T/A [At Work]:
Hmm... and you know the timing is right (car runs awesome otherwise), the cooling tubes are not kinked, and the waterpump is good? The only thing at that point I can think of is that it has to be the radiator at that point. |
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water pump is new but it's a duralast so who knows. timing has been verified a few times now but is right on the money.
tubes look fine? only one that looks like it's been damaged is for the Heater core.
gonna blast the rad cores out with higher pressure water and soap for a few hours
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Yellow-88
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JUL 12, 02:08 PM
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| quote | Originally posted by 82-T/A [At Work]:
Hmm... and you know the timing is right (car runs awesome otherwise), the cooling tubes are not kinked, and the waterpump is good? The only thing at that point I can think of is that it has to be the radiator at that point. |
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The radiator has been flushed by a radiator shop. The inlet-outlet Delta-T is roughly 30 deg. I haven't seen any info on what it should be but it must be published some ware. Outside temp and relative humidity will affect Delta-T.
This seems to be intermittent . A clogged radiator won't do that.
What's going on in the thermostat housing? That's where temp is regulated. I don't know if a T-Stat can stick intermittently.
A new T-Stat and its cap are a cheap easy test.
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82-T/A [At Work]
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JUL 12, 04:11 PM
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| quote | Originally posted by Yellow-88:
The radiator has been flushed by a radiator shop. The inlet-outlet Delta-T is roughly 30 deg. I haven't seen any info on what it should be but it must be published some ware. Outside temp and relative humidity will affect Delta-T.
This seems to be intermittent . A clogged radiator won't do that.
What's going on in the thermostat housing? That's where temp is regulated. I don't know if a T-Stat can stick intermittently.
A new T-Stat and its cap are a cheap easy test. |
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That's a good point... have you (Carter Carbs) looked at the thermostat cap and the radiator cap? The "new" replacement (aftermarket) GM-style ones are garbage, and actually don't even seal. Ogre has a picture that shows the comparison between the old ones and the new ones, and the gasket diameter is significantly smaller, to the point that almost none of the gasket is actually sealing... and it can cause massive overheating above a certain temperature (where the pressure causes the gasket to give way temporarily).
Thermostat should be an easy fix.. just get one of the ones that fail open... by STANT I think.
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cartercarbaficionado
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JUL 12, 08:38 PM
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| quote | Originally posted by Yellow-88:
The radiator has been flushed by a radiator shop. The inlet-outlet Delta-T is roughly 30 deg. I haven't seen any info on what it should be but it must be published some ware. Outside temp and relative humidity will affect Delta-T.
This seems to be intermittent . A clogged radiator won't do that.
What's going on in the thermostat housing? That's where temp is regulated. I don't know if a T-Stat can stick intermittently.
A new T-Stat and its cap are a cheap easy test.
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could be a possibility. I did put a 180 Dorman one in that got flattened somehow after it was heat cycled. put the stock 195 in and it didn't overheat for months afterwards but I changed the distributor and set timing to stock at the same time.
it is worth noting that on antifreeze it will overheat every time its driven but not with straight water. also remember that the radiator is no longer having much of a difference across its cores anymore. I'm pretty sure I'm gonna throw the 3 core champion in and do the larger fan blade mod and if it still overheats then I give up and im replacing everything
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cartercarbaficionado
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JUL 12, 08:40 PM
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| quote | Originally posted by 82-T/A [At Work]:
That's a good point... have you (Carter Carbs) looked at the thermostat cap and the radiator cap? The "new" replacement (aftermarket) GM-style ones are garbage, and actually don't even seal. Ogre has a picture that shows the comparison between the old ones and the new ones, and the gasket diameter is significantly smaller, to the point that almost none of the gasket is actually sealing... and it can cause massive overheating above a certain temperature (where the pressure causes the gasket to give way temporarily).
Thermostat should be an easy fix.. just get one of the ones that fail open... by STANT I think. |
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yeah new caps for both. front is the junky lever style but is better than the stock one it had (spring gave out) I've tried a new thermostat and no thermostat for awhile now and it's not shutting off with no stat so I think I'm losing capacity somewhere. especially since the fan has to run constantly
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cartercarbaficionado
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JUL 13, 06:46 PM
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somehow about a half gallon of water gas gone missing from the system. plus the entire reservoir and its not in the oil and I can't find a leak yet and no sign of water in the exhaust. I'm kinda stumped now since that doesn't make any sense and was totally fine without a reservoir working properly.
I did headgaskets and I'm really hoping those didn't fail again since that's alot of work and takes this 88 completely out of commission for awhile which sucks because its fun and has ac that works sometimes (very welcome in the 100 degree heatwave).
I'm at a loss currently as to what it's doing and why. everytime I think I have it figured out it really likes to throw a curve ball.
like the number one spark plug being loose somehow. it was fine a few days ago but not now I guess
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cartercarbaficionado
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JUL 13, 08:22 PM
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cleaned the rad and unbent some fins just for the hell of it really. it's flowing perfectly fine. the thermostat was tested in boiling water and sat in there for 10 minutes and did not even manage to open a quarter of the way. so that's a smoking gun alright. also put in the 5th new radiator fan relay and it's finally not trying to spin at 2 different speeds and actually spinning at about 3x the speed so I guess I finally got a good one.
honestly I'm starting to think I've been getting crap parts for the entirety of the ownership of this car since every time something is fixed it breaks again.
also if it overheats one more time I'm going to throw that radiator in a box and order the 3 row champion and Rodney's upgraded fan and if it somehow manages to overheat then I know exactly what the issue is. which will have to be coolant pipes or the engine is somehow running that hot
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longjonsilver
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JUL 14, 05:57 AM
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i have the three row Champion radiator and a vent for the rad too, and my fan never comes on. Perhaps the thermosyphon is enuf for here in Canada. ------------------
Astronomy says we will find a coded signal from outer space. Then we'll KNOW that life exists there, for coded signals aren't by chance.
Biology says there are coded genetic signals in every cell, but we KNOW that no intelligence created life.
I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 3800SC, 4-wheel drifts are fun!
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82-T/A [At Work]
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JUL 14, 09:24 AM
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| quote | | Originally posted by cartercarbaficionado:cleaned the rad and unbent some fins just for the hell of it really. it's flowing perfectly fine. the thermostat was tested in boiling water and sat in there for 10 minutes and did not even manage to open a quarter of the way. so that's a smoking gun alright. also put in the 5th new radiator fan relay and it's finally not trying to spin at 2 different speeds and actually spinning at about 3x the speed so I guess I finally got a good one. honestly I'm starting to think I've been getting crap parts for the entirety of the ownership of this car since every time something is fixed it breaks again. also if it overheats one more time I'm going to throw that radiator in a box and order the 3 row champion and Rodney's upgraded fan and if it somehow manages to overheat then I know exactly what the issue is. which will have to be coolant pipes or the engine is somehow running that hot |
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If it helps... I've had really good luck shopping on Rock Auto. Specifically because I can pick and choose the parts I want to buy. Most times, the stuff on clearance is actually the better / older parts made either in the United States, or in Taiwan. Sometimes the parts are also top of the line parts, but clearanced because they're in older packaging. Either way, I've ... saved (?) a lot of money that I would have otherwise have had to spend more on just getting whatever the local auto parts store had. I've always had good luck with NAPA... honestly, the only local auto parts store I actually trust.
As for the cyl head... you probably know this way better than I do... but the cyl head on the Iron Duke is VERY prone to cracking. It's like one of the most common failures in these cars. I've cracked one myself, and basically had to junk it. I'm sending out (just cost of shipping) a spare 87-88 Iron Duke cyl head to someone who did the same thing on their 88 4-cyl Fiero.
It's awesome you discovered the culprit.
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