2002 overheating AGAIN

[biddle]

I have a 2002 Thunderbird that recently overheated. It had overheated once before several years ago and the problem was a cracked overflow bottle. This time my wife was driving in very hot weather (90 degrees) and in stop and go traffic and the car overheated. My mechanic (not a tbird specialist) tried to reproduce it by running it idle, running in idle with ac on and driving the car around for 15 minutes or so but the temp indicator remained normal slightly below half way. He replaced the thermostat anyway. I just ran the car in idle for about 1/2 hour, 10 minutes of AC on and a few minutes of slightply increased rpm but the gauge was again normal.

I’m concerned about the hydraulic fan failing and my question how does fan failure show itself? Did anything that I or my mechanic did test the fan’s operation meaningfully? I would prefer not to be stranded somewhere if I can avoid it but I realize the risk may be unavoidable. I should mention that I almost never use the car’s air conditioning system.

Since this topic has already been discussed extensively, I merged your post here.

Search the forums for hydraulic fan and you will get your answer. Example:

2002 Hydraulic Fan Behavior

I have a 2002 T-bird with a hydraulic fan. It speeds up when the A/C is turned on as expected, but it increases speed at a very slow rate. I don't know if this is normal. When the A/C is turned off, it slows down very slowly. When the car is turned off, the fan keeps spinning for awhile as it...

forums.fordthunderbirdforum.com

 

[Slacker]

I have been fighting this cooling system for a while after having to replace the plastic connecting pipe that had disintegrated at 50K, which I found was a common occurrence. Poor design meant taking off the intake to replace it due to the back bolts being about a quarter inch to long. I get this done replace the coolant, burp and I thought I had it beat and the upper radiator hose failed when part of the plastic connector gave out.

Put a new one on yesterday and ran through the "burping" three times and gave up and went to bed last night. It is not a simple system to work on at all and I agree that getting the air out seems to be the trick, but it is not an easy or intuitive task to accomplish.

I had to replace the thermostat housing and since the old one was bad anyway I just broke it up so I could get to the back bolts. Then when I replaced the new one I switched out the bolts for Allen head and a swivel Allen wrench works

 

[mformella]

I had an overheating issue 8 or 9 years ago too. I had ordered a new hyd fan assembly from ford . you have to remove the radiator to do the install. When I removed the radiator I had seen the problem. The entire bottom half of radiator was plugged with with debris. Odd because only the radiator was plugged up between the a/c condenser. It was packed solid so I replaced the radiator,new coolant, properly bleed the system and car was good to go. Now car is starting to overheat again, but will not when the a/c is on . I am currently trying to figure this one out. seems that the hyd fan only runs at a small percentage of speed all of the time until the a/c is turned on. I have not found how this is controlled. Will keep posted as to what I find.

 

[doug7740]

Now car is starting to overheat again, but will not when the a/c is on . I am currently trying to figure this one out. seems that the hyd fan only runs at a small percentage of speed all of the time until the a/c is turned on. I have not found how this is controlled. Will keep posted as to what I find.

The system consists of an engine-driven pump with an integral solenoid on the pump that is triggered by the powertrain control module (PCM). Fan speed is controlled by adjusting current to the solenoid, which then changes the fluid flow to the hydraulic motor. More current means the solenoid opens up, allowing higher pressure to increase the fan speed.

doug7740
1955 Thunderbird Blue