Overheating...dead horse

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mpeterson

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2002 LS V8

Okay I have tried to read back through a majorioty of the overheating issues, and they are helpful. I fixed a bad DCCV valve about a year ago when I was getting no heat in the colder months. Now here is my latest overheating problem.

Drive the car with the AC on blows cold air and after about 15 minutes, seems to begin to overheat while still blowing cold air, turn the AC button off and stays at temp or begins to cool down. Changed the thermostat on Saturday night, bled the system, and took off for a drive about ten to fifteen miles with AC on max, temp stayed right on the middle line, got back home, parked and let run while picking up tools hopped back in no change in temp.

Wife goes to run errands this morning, starts overheating again.

1. I don't believe it is the degas bottle, but can I check this at home and how?
2. Could it be the coolant temp sensor?
3. Would the DCCV cause the overheating?
4. I guess my last guess, and probably the most hated, would be the FAN, and how can I check this?

Any feedback is appreciated.

Thanks,
Mark
 
1. Yes, you need a pressure tester. Don't pump it to more than 16 PSI though.
2. Maybe, but it is less likely than the other possibilities.
3. Not the way it normally fails. It could only cause the issue if it had a big leak and let air in.
4. This is probably your problem, based on your brief symptoms. I don't think you can do anything other than check for very high airflow when the engine is overheating. Lincoln dealers can do a pressure test to determine if it is the pump or the fan motor.
 
Okay thanks, I will have a pressure test done and see what they say.
 
Same problems with my car. It is not a coolant issue, but either a fan or a pump issue. Most likely the fan is not getting up to high speed when you turn the air on. I have been researching this. You should know that the Lincoln dealers do not troubleshoot this to find if this is the fan or the pump. Good luck even finding a dealer that has a steering pump analyzer that can test pressure. (yes, I know it is the cooling fan system.) Most service managers will ask their best mechanic if they have the tool and then you get a deer in the headlights look from the mechanic. These are expensive pieces of equipment and no mechanic wants to buy one. If the mechanic is honest with you they will tell you that the repair protocol is to replace both the fan and the pump. Write that check for $1400.00 and you have a great working fan again. This is BS in my opinion. If you can find a dealer that will do the test, great, but talk to the mechanic that is doing the work, not the service manager and you will get the real story.

If you have any mechanical aptitude you should spend $10.00 and buy a quart of synthetic Mercon and change out the fluid. The system holds less than a quart. It is possible this will solve your problem. Smell the fluid in the fill tank. It most likely will smell burned and worn out. Get new fluid in there and see if that solves the problem.

Good luck.
 
One other possibility is actually a problem in my car. Take off the dress up cover over the radiator that also controls access to your headlight bulbs. Look down between the radiator and air conditioning condenser. Mine is badly plugged up with debris and I can't really see how the radiator is even providing cooling right now. I am between houses and living in a hotel right now, but I want to clear this mess asap. So do yourself a favor and pull that cover off and take a look. I guess that the fix is to blow it out with air or water.
 
milehighmikey said:
One other possibility is actually a problem in my car. Take off the dress up cover over the radiator that also controls access to your headlight bulbs. Look down between the radiator and air conditioning condenser. Mine is badly plugged up with debris and I can't really see how the radiator is even providing cooling right now. I am between houses and living in a hotel right now, but I want to clear this mess asap. So do yourself a favor and pull that cover off and take a look. I guess that the fix is to blow it out with air or water.
Click to expand...


+1
 
If you see coolant on the ground behind your driver's side front tire it's probably your degas bottle, you won't be able to see the crack in the bottle from the top, it's at the bottom probably. i had the same problem about six months ago on my 2002 LS V8, changed the bottle and it hasn't overheated since.
 
OK, finally had the mechanic work on this long overdue issue.

Here is what has transpired, and what is still and issue. I had him replace the heater control valve, the hydraulic fan actuator, the thermostat and the degas bottle. He said he has bled the system a few times at the degas bottle bleeder and the car has been running for about an hour, initially had cold air on both sides. Now the temp is a little over the middle temperature mark, (which it has typically ran right on the mark in the past). Now he said cool air on the driver side and hot air on the passenger side.

Does anyone have any suggestions?
 
Sorry, by heater control valve, I meant DCCV valve. I guess I could have received a bad one?
 
I was thinking it just needs bled more, I know a few years back if I remember correctly, when I replaced the dccv valve it would act up for a few days afterwards and some additional bleeding had to be done until things finally worked correctly.
 
Could be a bad one, or a problem with the ATC module. Also if the AC refrigerant is low it seems to cool the driver's side of the evaporator better than the passenger's side.
 
10-4, he was going to top of the refrigerant after we talked, I don't know how things ended up. Was there a way on the AC control to reset things or does that have anything to do with this issue?
 
In my experience also any time the temp gauge showed past half--even by a needle width I had air in the system. You may have a great mechanic, but if he has never bled an LS cooling system before it might not be done fully. This will cause overheating issues, and not affect pass/driver's cooling I don't think.

You can get a used ATC module on ebay for cheap if you decide to try a different one.

For instance

http://www.ebay.com/itm/LINCOLN-LS-...Parts_Accessories&hash=item41656a5bb6&vxp=mtr
 
I think I am going to have him drive it, and thrash it around a little and see what the temp does then, I am with you any thing above half there is still an issue with the cooling system, more than likely the bleeding. With replacing all he replace I am most certain that is still the problem, but the LS can be stubborn about gettign all of the air out of the system...
 
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