Question about 1990 Buick Regal

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I have a 1990 Buick Regal v-8 Does the radiator fluid move from radiator to reservor as engine heat and cools or remain in radiator except under extreme heat conditions?

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A certain amount will run into resavor or draw out after it is shut off no matter what the tempature is, the only exception is if it is low on coolant in the radiator it will draw out of the resavor to maintain the right amount to the cooling system. but when engine is running it should not do either one because the coolant is flowing.

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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How would I convert a radiator from a 1987 Buick regal to my 1991 Cadillac eldorado? And can I 8 run the he oil and tranny cooling lines with one hose each instead two each?


no you must have two lines for each . one is oil and one is transmission fluid, they both have a supply and return line. As for radiator yes use special lines.

Sep 13, 2017 | Buick Cars & Trucks

1 Answer

How do I replace my radiator in a 1996 Buick Regal 3.8 3800series


This is actually not too difficult.
I recommend replacing the upper, and lower radiator hoses while you are replacing the radiator if they are getting old.
1. Disconnect the battery.
2. Remove radiator fan (Some had two 10mm bolts at the top, and slots at the bottom, others had two more 10mm bolts on the bottom.) - And unplug the electrical connector.
3. Disconnect transmission lines (you will loose a bit of fluid)
You may also have two engine oil cooler lines that need removing (Also may loose some oil)
4. Remove upper and lower radiator hoses, and the overflow jug hose.
5. Unbolt radiator (should have two 8 or 10mm bolts connecting it to the radiator support near the top of the radiator)
6. Pull radiator up and out.
7. Reverse for reassembly
8. Refill radiator, I usually leave the top radiator hose loose while filling to remove air bubbles in the engine. - reconnect upper hose when fluid starts to get close to the radiator inlet. Some of these engines have a small brass air bleeder near the thermostat housing to accomplish this in a different way. Also fill the overflow jug about half way.
9. Check transmission, and engine oil. - Run engine, and watch for any leaks. - Recheck antifreeze just to be sure. Obviously don't open the radiator cap when the engine is hot.

Feb 10, 2015 | Buick Cars & Trucks

1 Answer

1990 Buick Regal overheating


You have leaking engine cylinder head gaskets, this may be the cause of the overheating or a result of it, replace the head gaskets and have the radiator cleaned by a by a radiator repair shop, that should cure the problems.

Feb 06, 2012 | 1990 Buick Regal

1 Answer

1992 Buick Regal transmission fluid getting into engine.... how is this possible? Notice it because oil level keeps increasing without adding oil, oil consistency changes and smoke out of tail pipe.......


Your radiator is connected to the transmisiom to cool the transmission. the tank in the radiator has ruptured and transferring fluid to where it should not be. solution replace radiator. This will transfer trans fluid to cooling system and vice versa. I can not see the trans oil ending up in the engine oil sump for any reason?

Nov 16, 2010 | 1992 Buick Regal

2 Answers

I have a 94 Buick Regal Custom with a 3.8 V6 engine I just got a new battery two days ago and yesterday I was driving to work and my car started to overheat when I pulled into work and looked under the...


It may be that the coolant spraying from the open radiator shorted out the electric cooling fan. This would cause overheating even after refilling the antifreeze, and if the short is severe enough, could also drain the battery. Try charging the battery with a plug-in charger overnight, and remove the fuse for the radiator/cooling fan. If it starts up and runs as normal until it begins to heat up, this is probably the case. It would be a good idea to clean the whole engine with degreaser, being careful not to get it in the alternator, and to clean all electrical components with QD contact or electrical cleaner. It could also be a short in the heater fan circuit, but this is less likely. It is more likely that the draw from the heater fan took too much power away from the radiator fan, especially if the battery was marginal due to excess heat or shorting from having gotten very wet. Also, check that the polarity on the battery is correct, just for good measure.

Dec 17, 2009 | 1995 Buick Regal

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97 Buick Regal - Fill Coolant Light came on, the tank was drained to the bottom. When I fill up the radiator reserve tank the fluid is coming out of a small, 1/2 inch diameter maybe, black rubber hose...


The heater core inside the passenger compartment is leaking. The water is draining through the Air Conditioner condensor drain tube. Don't plug the drain tube, the passenger side floor will get wet.

First, drain cooling system (or be quick) and disconnect the two heater hoses that are going into the firewall and splice the ends together with a 5/8" garden hose splicer.
The leak will stop, but your heater will not heat the interior.

Replace the heater core....

Oct 01, 2009 | 1997 Buick.5 Regal

1 Answer

1990 Regal Coupe 3.1 engine. Low Coolant Light Stays Lit


This is a COMMON Problem that GM had with the Level Sensor Curciut, And they Never Correctly Addressed it. I Have on ocations Replaced the Sensor and that Corrected the Problem, BUT Other times the Light STAYS ON No matter What, I have tracked the Wires and all I Have Ever Found was the Plug Being FAULTY. So if A NEW Coolant LEVEL SENSOR Does NOT Turn off the Light, try Replacing the PLUG Itself.

Aug 26, 2009 | 1999 Buick Regal

1 Answer

My 1990 subaru legacy was running fine-I went to the store less than a mile away and when I got home something was leaking from underneath the car and there was steam coming from under the hood..i don't...


Just because it was not hot to the touch, does not mean it is not a coolant loss problem----if the coolant is so low, there may not be enough to make the radiator hot (though usually the steam in the system will).
...a stuck thermostat can also let the engine overheat while the radiator remains cool (the fluid only circulates within the engine and is stopped from getting to the radiator.
...likewise a hose could have burst below and let the coolant out, over heating the engine, and the steam going out the ruptured/popped off hose; would look underneath..
...when cool, check the level in the radiator (likely empty),
...and less than a mile away, may not have ever heated the radiator, though usually only a mile to heat up the coolant
...of course there is always sabotage
...and water pump failure, (so no water circulated) causing overheating and no radiator heat, and possibly enough pressure to blow off a hose, but usually the radiator cap relief spring would allow pressure to escape (and that steam would heat up the radiator on the way---but if only steam in the radiator, it would cool off quickly after venting, because no more water in the radiator to hold the heat. all depending on climate,temp and further details , symptoms..
hope helps..

Aug 09, 2009 | 1990 Subaru Legacy

1 Answer

Low Coolant light flashing on 1996 Buick Regal 3.8


The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.

Mar 01, 2009 | 1991 Buick Regal

2 Answers

Coolant fill procedure


NEVER open the radiator when the car (or any other engine) is running!! The radiator is part of the pressurized cooling system (under that cap is coolant at 15psi)

Correct way to check the coolant in the radiator, is wait until the engine is COLD, then remove the radiator cap and re-fill.

Jul 17, 2008 | 1991 Buick Regal

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