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Old 06-23-2007, 01:12 PM   #1
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I have a 2000 Cruise Master, 35' w/ a single slide and a V10. We just passed the 105k miles, and just started to over heat while towing my mini van on tow dolly. The temp gauge shows normal, till we start going up a long hill. Once we are over this hill, the temp goes back down. Twice now, the over temp lite has come on, but goes out after we cross the top of the hill and start going down hill.

So far, I have replace the termosat, the fan clutch and just had the coolant system flushed. I think that the water pump may be the problem. A friend told me that he thinks I could have burnt a cyclinder. The mechinic that replaced my fan clutch, suggested that I could have a leak in the head gasket, or even the temp prope may be weak.

I was told by some other V10 owners, that while going up a steep hill, and the engine is running at high rpm's, and the transmission changes gears, you may hear a squeeling noise coming from the engine. This could mean that the water pump may have spun loose inside the housing.

Any ideas, or if someone out there has run into this problem?
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Old 06-23-2007, 01:12 PM   #2
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I have a 2000 Cruise Master, 35' w/ a single slide and a V10. We just passed the 105k miles, and just started to over heat while towing my mini van on tow dolly. The temp gauge shows normal, till we start going up a long hill. Once we are over this hill, the temp goes back down. Twice now, the over temp lite has come on, but goes out after we cross the top of the hill and start going down hill.

So far, I have replace the termosat, the fan clutch and just had the coolant system flushed. I think that the water pump may be the problem. A friend told me that he thinks I could have burnt a cyclinder. The mechinic that replaced my fan clutch, suggested that I could have a leak in the head gasket, or even the temp prope may be weak.

I was told by some other V10 owners, that while going up a steep hill, and the engine is running at high rpm's, and the transmission changes gears, you may hear a squeeling noise coming from the engine. This could mean that the water pump may have spun loose inside the housing.

Any ideas, or if someone out there has run into this problem?
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Old 06-23-2007, 03:51 PM   #3
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Welcome jcrowder47 to irv2.
Water pump will give out a squeel when it time to go and a loose fan belt or idel pully will also. Guess its time to have a good check with 105k miles than your will be good to go for another 105k.
I will short cut your question down to Ford forum below for some more help.
Enjoy the forums and do post often.
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Old 06-23-2007, 07:55 PM   #4
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Have a High Flow aftermarket water pump , not a stock Ford OEM , installed and all your worries will go away. Check with SUMMIT racing parts they have a catalog.
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Old 06-23-2007, 08:07 PM   #5
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If it is a head gasket you sometimes can see bubbles in the water flow with the cap off, but mite be hard to see with resvoir style system.
Sounds more like a Rad blockage. With over a 100K it's given good service.
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Old 06-24-2007, 04:33 AM   #6
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"over temp lite"? You mean the check gauges light? Have you hooked up a scan tool of some sorts and checked what the temperature actually is?

You have towed the mini van over the same grades at the same ambient temperatures, and the same speed before and not had a problem? Sounds like it?

Ford modular water pumps are pretty darn simple. The "truck" pump is a little larger than the "car" pump. Thing about the pump is that it'll pump WAY more water than you need. Water flow is determined by the restriction in the system. Usually the thermostat is the lowest flowing piece. I wouldn't suspect water flow right away though. I'm thinking more about airflow. Are all the rubber airdams around the radiator in place? What roadspeed would you say the problem is occuring at? I suspect rather slow? The fan is coming on, right?

I plan to add an airdam to our motorhome as the fan comes on in 80 degree weather doing 70 MPH on the freeway. Between grill design on the lack of an airdam, we're just not getting enough airflow (at 70 MPH there should be plenty without the fan!).

Of course with 105K miles, it could be about anything. Keep us informed...
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Old 06-24-2007, 07:58 AM   #7
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jcrowder47, It would appear your engine isn't overheating to a critical point otherwise you would notice an immediate loss of power as the ECM would put your engine into a "LIMP" mode shutting down alternate cylinders. If it gets too hot the ECM is programmed to shut down your engine completely to prevent damage. You could have a faulty temp sensor, but worth running a diagnostic and have it checked out.

Good luck, Jim
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Old 06-25-2007, 12:56 PM   #8
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Thanks for all of your inputs and thoughts, it is true, that the more inputs you get the better the out come.

My tech in Atlanta, has suggested several different problems areas. He wants to do a compression test on all cyclinders, checking for head gasket leaks. What I want to do is, when we get home, is to take him for a ride with the van hooked up and his testing equipment, drive up and down the interstate to see what temp is when the gauge moves and also to see what the water flow is through the water pump.

I normally drive at 65 on the interstate, and I tow a Pontiac Montana mini van, and it load with my equipment that I use in my business. (This problem just started about a month ago.) If the hill has any length and some what grade, I can see the temp gauge start to raise, and when it gets to a certain point, I will slow down some what till I reach the top of the hill. But, this problem does not show up while driving slow, like in traffic. After the hill climb, and I am traveling on level or down hill, the engine cools quickly to normal.

I need to get this done as soon as I get home in July, we have some long trips ahead, and will be traveling up and down some big mountains, like Denver.

If there is any other suggestion out there, I will be checking every so often.

Thanks
Jack
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Old 06-25-2007, 05:13 PM   #9
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Jack,
I have exactly the same problem on my 99 V10. Wish I could give you the answer but I am in the same place as you. I have replaced the fan clutch, belt and t-stat as well as chnging coolant. No change. I can offer the following on temperatures as I have cross checked with a scan gauge. My normal flat road at 65mph and 70F is 200F. Pulling a hill, the dash gauge doesn't move until I exceed 225F. From there it climbs rapidly until I get to rde zone at about 240F. Then I back off and it cools rapidly. One interesting thing is the fan clutch never kicks in. I believe that is supposed to occur at 225F. I am now questioning if the temperature sensor is accurate. I believe that same sensor drives both the dash gauge and anything reading temperature through the OBD2 connector.

My current plan is to replace the temp sensor and if the problem remains, add an electric pusher fan. I don't believe I have a compression or head gasket problem as the engine runs too darn well and I'm not lossing any coolant. I will be staying tuned to this thread.
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Old 06-26-2007, 12:20 PM   #10
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Something just occured to me. You both (folks with cooling issues) have green coolant, right? Ford was slow to adopt the orange organic acid coolant as it was eating parts up in the cooling system. If someone swapped in orange stuff, you may have some damage somewhere (gaskets, pump, radiator) causing overheating.
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Old 06-26-2007, 03:47 PM   #11
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Capt Flipper and crowder 47,

Make sure you have not put in too much anti-freeze. More than a 50/50 mixture can cause an over heat condition. Also a head gasket problem will cause a loss of coolant, as well as (usually),overheating regardless of hills.
Not really sure on the V-10 engine, but the fan clutch on most engines is mechanical, and does not use the temp sensor to activate it, but rather a thermostatic spring facing the radiator. I would also temporarily install an accurate temp gauge rather than the dash unit to establish what the temperature of the coolant really is.

Good luck,
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Old 06-26-2007, 09:01 PM   #12
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I've had the green coolant in our 2000 v10 now for 7 years & 52,000 and so far no overheating problems.

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Old 07-11-2007, 05:20 PM   #13
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Our 99 V=10 is experiencing the same problem on hills over the past year. The Clutch Fan does not come on in the High Roar mode.

We just tested the fan clutch to ensure it does not spin freely, and it stops immediately on engine shutdown.

We even used a 2x4 piece of wood to try to stop the fan from rotating on cranking the engine, impossible to cause it to stop turning, so we are told that it is not the Clutch Fan.

The other common problem I read on the one of these forums is the Overflow Filler Pressure 16 lb.Cap which become defective on these engines, so picked up a new one today, will be on the road later this month to give it the test on a long hill.
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Old 08-11-2007, 05:09 PM   #14
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Please update the site with your findindgs as I have a 1997 Ford Triton v10 Class c 29' runs on the hot side any time I push it any or am on a big hill.
Mine has the green antifreeze and have had this problem for 3 years. As soon as you have gone over the hill its fine. Have to drive real carefull with it though. I have no loss of coolant. I do use 5-20 w synthetic blend oil and it does use about a quart of oil per a 2 day trip. 91,000 miles on this.

I am ready to do whatever it takes - just glad to see I'm not the only one.
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