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Comments
it ran hot (but not up in the red) on a real cold day (18 over nite ) and i was told it was the thermastat well changed that and 2 days later i drove the car 35 miles and the needle never went off the C on the guage, took cap right off the radiater when I stopped and put finger in the water was cold!!!! , changed the thermastat again (figured it was a bad one) ran great for 2 days ... the temp. started to rise again...???
no leaks no steam no hissing no nothing.... any guessess?? oh the water pump, and fan are working fine please help i love my car
Bulletin No.: 00-06-02-001
File In Section: 06 Engine/Propulsion System
Date: January, 2000
Subject:
Engine Running Hot, Overheating and/or Loss of Coolant (Polish Radiator Filler Neck and Replace Radiator Cap)
Models:
1999-2000 Passenger Cars and Trucks with Composite Radiator End Tank
Condition
Some customers may comment on one or more of the following conditions:
^ Engine running hot or
^ Engine overheating, and/or
^ Loss of coolant/low coolant message
Cause
The radiator filler neck may have an imperfection in the sealing surface.
Correction
Important: DO NOT REPLACE THE RADIATOR.
Using a piece of 400 grit wet/dry sandpaper backed with a flat piece of wood, polish the filler neck sealing surface using a circular motion.
Replace the radiator pressure cap with a cap of the same part number as shown in the GM Service Parts Catalog.
Or this one..............
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-02-019
Date: December, 1999
TECHNICAL
Subject:
Coolant Leak at Engine Heater Inlet Pipe Connector/Fitting (Tighten Connector/Fitting)
Models:
2000 Cadillac Seville with 4.6L Engine (VINs Y, 9 - RPOs LD8, L37)
Built between VIN Breakpoints YU151384 and YU151853
Condition
Some customers may comment that engine coolant appears to be leaking from below the EGR valve pipe assembly at the rear of the water pump housing. A pink tell-tail line of coolant below the attachment of the EGR valve pipe assembly and the heater inlet pipe connector/fitting, at the rear of the water pump housing1 may be visible. An accumulation of coolant on the transmission case directly below the heater inlet pipe connector/fitting may also be visible.
Cause
This condition may be due to the heater inlet pipe connector/fitting threads with sealant not being sufficiently engaged to the engine assembly.
Correction
Ensure the heater inlet pipe connector/fitting is tightened to the proper torque specification.
1. Disconnect the transmission shift cable from the shift lever.
2. Use a 11/16 inch off-set wrench to tighten the connector/fitting taking care not to exceed 40 N.m (30 lb ft).
Important: If the connector/fitting is torqued to specification, the cause of the coolant leak may be an insufficient amount of thread sealant. Apply GM Goodwrench/Locite(R) Pipe Sealant, P/N 12346004, (or an equivalent sealant that meets GM Material Specification 9985473) to the connector/fitting threads.
3. Connect the transmission shift cable to the shift lever.
I have a 2002 olds Intrigue. about 2 months ago the water pump broke down and leaked . my uncle is a mechanic and he replaced the water pump . he told me that he thinks there is no or very little effect on head gasket or engine.
car is running fine, the niddle of heat gauge on the dashboard is between 25% and 50 % of heat while car is moving, and shows about 55% when car stops at a signal, and goes back to less than 50 % when car is moving.
the probelm is when car is ON but not moving for couple of seconds fan turns ON and I can feel the vibration of it like its running full speed.
and it stays ON for about a minute after the car is turned OFF. I can hear the noise of the fan even if the hood is closed.
and if I turn ON the car after say about 1/2 hour, I can't here the sound or feel the vibration.
I think It only happens when niddle on temp gauge crosses 50 % mark .
car doesn't overheat . no effect on the mileage.
plz help me with this
thanks in advance
If the fan is loud and causing a lot of vibration, it may signal that an impending fan failure is around the corner. It might be time to have the fan checked......
Unless, before the water pump replacement, the temp guage always stayed at the mid-point, and the fans seldom ran.
If so, you might have air in the system. Is the coolant overflow/recovery container - the place where you check the coolant level - is it at the 'normal' level. If not, especially if it is empty, add a 50/50 mix of coolant and water and drive and stop the car a few times. After a car is warmed up, then stopped and cools down, if there is a need for additional coolant in the system, the vacuum generated will pull coolant back into the system from the recovery tank as it cools down. So, if it is low, add some and also check again after a few drives, because you might need to add even more.
And, your uncle is not a bad mechanic if you need to add some coolant. This is something that can easily happen, not being able to get the system completely full, after opening up the system, such as replacing the water pump.
A low level of coolant in the system, meaning there is air in the system, could cause variations in the temp guage reading, and could cause the coolant to overheat upon shutdown, causing the fan to run after shutdown.
Thanks for your feedback.
Ed
I can give more info if you would like.
Thank You.
No one ever got back to me on this problem. Since I first left this message, I have replaced my water pump and timing belt, and it is still happening. Does anyone know what the problem can be here? Thanks...
W.r.t. the timing chain, that sounds like non-sense that the coolant leaking would come into contact with the chain and cause it to corrode.
Now, if in having to remove the water pump requires that they remove the timing chain housing and expose the time chain anyway, and if you think you have high enough mileage that warrants changing it now, that is another issue.
I have had a couple dozen vehicles over my lifetime and have NEVER, EVER had to change a timing belt on any of them.
This sounds like the old, "As long as we're changing your oil, let's change your air filter, PCV valve, etc.", that is to say, once they get your car into the garage, they will want to "fix" alot of things and charge you for it, even if it really doesn't need fixing/changing !
Shifty may have a point with an internal coolant leak, but you didn't say you had to add coolant to my recollection.
How many miles?
http://www.troubleshooters.com/tautomot.htm
As you can see, overheating is really a complex problem that requires very careful diagnosis.
As a general rule, if you overheat at LOW speeds but not on the highway, you have an AIR problem
If you overheat at highway speeds but not necessarily at idle, you have a CIRCULATION problem.
If you overheat VERY quickly, you probably have either a stuck thermostat or a bad head gasket (also known as a Tea Kettle, because it boils water).
Very often, water pumps and thermostats are replaced for no good reason, because the mechanic is not thinking logically or doing simple tests.
But sometimes even the best mechanic pulls his hair out (not in my case as I don't have much) with an overheat problem, because you can't really SEE or COMPUTE the problem, You have to use other senses to get at it.
In your case, I'd test for combustion gases in the coolant, and I'd pressure the system with a pump and pull some spark plugs and look for coolant on them.
If that's not it, I guess I'd pull the radiator or at least have it inspected by a pro. I presume your cooling fan is in order and I presume you DO overheat on the highway speeds.
ok i got alot to think about ... it now runs hot quickly when i first had it fixed (thermostat ) it did not even move off of cold for 35 miles and the coolant was still cold when i got home.
the car has never steamed up nothing like that but i read where that didn't mater a head gasket could still warp.
and it went 2 weeks then ran hot on the expressway this last time after everything had been fixed....i went 45 miles in traffic to work just fine the needle never moved till I came off the express way then shot up ...... then on the way home 9 hours later it started running hot after only 5 miles on the expressway, no traffic.... that's when i parked it, i could not think of any thing else to do to fix it.
thanks for all your help
A bad head gasket may not mix water and oil. That's not a sure way to tell since it depends where the head gasket breaks or leaks. It can leak water into oil, oil into water, exhaust gas into water, or everything to the outside of the engine.
Please help.....I've talked to 5 different service centers, and they are all telling me different things!
Thanks.
Have the system pressurized (they use a pump attached to the radiator) and see if a leak appears.
No, you aren't supposed to "weep" coolant.
No, sprayed coolant doesn't "evaporate" on your chassis---it's quite sticky and oily in nature and will form a residue.
Water pump? Possibly, if the impellers (the little blades inside) are eroded and eaten away. But if a water pump were leaking, you'd see it.
Over-heating can be a very complex problem to diagnosis and one has to go at it step by step. A mechanic just can't throw parts at the car and hope he/she hits something.
If no leaks appear upon pressurization, the spark plugs should be pulled out to check for coolant on them (head gasket).
You could be burning the coolant in other words.
Timing chain? If your car has a timing chain, instead of a "belt", then it should never need replacing. I can't recall which your engine has. If it's a belt, then follow the recommended replacement mileage, which you can find here:
http://www.edmunds.com/maintenance/MaintenanceServlet
If this is a thermostat issue, it should be easy to fix, but even the mechanic who replaced my timing belt didn't know exactly what the problem was. Can any of you help me?
"Hi there...
I have a 1997 Honda CR-V with 143K miles on it. Today when I was driving home from work, my dash temp was showing the regular 1/2 setting, which is where it has stayed after I replaced my radiator 6 months ago. Tonight, it suddenly dropped and almost went back to the cold setting - it dropped to about 1/8 while I was driving on the freeway at speed. It stayed there even when I slowed down off the freeway for about 5 minutes, and then it returned to the normal setting. I didn't notice any smells, steam/smoke, or noises in my engine. The air temp is now 42 degrees in Houston, which is way colder than normal, but my car's never done this before. Does anyone have any ideas as to what happened? Thanks..."
You may have an electrical problem, as opposed to the temperature actually chaning. Could be a temperature sensor, wire connector at the temperature sensor is loose, or the gauge itself is going bad.
Yes, I'm a female and no absolutely nothing about cars. I desperately need help here. I'm afraid if I go into a shop they will talk me into something that is not the true problem.
If you are tired of the trial and error way of fixing something, take it to a compentent shop where they can pressure test your radiator system and figure out that you are loosing pressure or not (we pretty much know that you are).....and then they can detect if it is leaking external to the engine. If leaking and not external to engine....then you know you have an internal engine problem and probably need new head gaskets.
If its leaking external to the engine, most of the time you'll be able to see the leak. Leaks on the radiator may be difficult to see, depending upon where it is.
There is an overflow tank associated with the radiator. It should be filled up to between the lines. Explaining operation. Radiator is completely filled up. As the engine warms the fluid in the radiator expands and is pressurized. When the pressure exceeds the radiator cap pressure rating, the cap opens slightly which allows the excess to flow into the overflow tank and it is captured. When the engine cools, the fluid cools and shrinks in volume, drawing a vaccuum on the radiator cap, which draws fluid back out of the overflow tank and refills the radiator.
So the radiator should always be completely filled up to the top.
Top off your radiator, and then fill up the overflow tank to in between and hot and cold markings with a 50/50 mix of antifreeze and water (or the premixed).
It doesn't sound like the radiator was low, 1" or so below the cap could be normal for cold. If you had to add coolant to the overflow tank because it was low then I'd keep an eye on it for awhile just to be sure there's no problem cropping up......
I have had to add a little coolant in the past. I have always suspected a very very slow coolant leak. The dealership tested a couple years ago and said no leak. But, I did see a little brownish/blackish gunk (oil) stuck to the filler neck. Nothing in the coolant itself that I could tell. Oil level and dipstick is always fine. So, I guess that would be the manifold gasket?
Check along the side (or top/bottom) tanks on the radiator. These modern aluminum radiators with plastic tanks that are crimped to the core have a tendency to leak slightly at the core to tank seal, and your about at the age where it happens. It can be very difficult to see. You could also have a leaking radiator cap that allows a little seep to escape when it warms up, or a slightly leaking heater core.
I think you can see where this is going, back to the pressure test.
One other thing, it's also possible that the overflow tank has a small leak in it, either through a stress crack or the seal for the low level sensor.
If you do have air, then there are a couple of typical causes:
- you could have a leaky overflow hose (that goes from the radiator cap to the bottom of the overflow tank). If this had a leak, when the radiator was cooling back down and sucking the coolant back into the radiator, it could suck air in. You might want to cut an inch off where the line attaches to the radiator, give yourself a new rubber stretched joint.
- you could have a bad radiator cap. The cap is built to hold pressure up to a given amount of pounds and then open up to allow the radiator to purge air/coolant into the overflow tank. Upon cooling and reduction in pressure, overflow coolant should be sucked in. The rubber seals and spring of the cap enable this, and there should not be any leaking (pressure in either way), to the outside air. The seals should only pass coolant between the radiator and the overflow tank.
- your overflow tank is empty, and it's drawing in air instead of coolant
- the worst....a leaking head gasket. If the gasket is damaged, then air mixture from one of the cylinders can be forced into the cooling chambers as the piston compresses the mixture. Since the pressure in the cylinders is 150ish lbs-ish, and the pressure in the coolant is 15 lbs-ish. the air is forced into the coolant, which is then ultimately purged out and released by the radiator pressure cap.
It is also possible that a hose is allowing air into the system when it cools down. However, if it was that loose that air would enter there versus the radiator cap...then you'd see the leak as the hose was pressurized.
So when checking your radiator when it's cool, if you have air, you have one of those problems.
It's the 3.8 engine, suppose to be one of G.M's best. I have read before that select model years had trouble with intake manifold gasket. When I bought the car 4 years ago there was a bit of oily residue around what I thought was the valve cover gasket. Never a problem... doesn't seem to have gotten any worse.