Hello, My car started overheating after an hour of open road driving, I quickly pulled over and let it cool for abit.I noticed coolant bubbling out of the overflow while I was waiting. I managed to drive the car home slowly without overheating it. I noticed that driving around town at slow speeds or in traffic the temp is normal. So I decided to drive the car to my parents home which was an hour away, the roads are relatively straight and flat until the last 40kilometers, its has a couple of hills after that and a slight gradient. The temp was fine until I got to the hills which is not even that steep, it starts to get hot and this is after 50mins of driving at 110km/h, the second I take my foot of the gas and slow down the gauge stops climbing.
The fans still work, I flushed the cooling system and put new coolant in 2 months ago. The heater doesnt work and it never has since I bought the car 2 months ago. Looks like the hoses and radiator was replaced before I purchased the car. It also starts rattling when it gets to normal operating temp and it has done this since I purchased it. Never had any overheating problems with the car until now.
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Re: 1995 Diamante overheats on hills.
The heating up as you build revs, to me, indicates a partially oped thermostat. If it hasn't been replaced, I would do so. It's inexpensive and easy enough to do. Make sure you get a gasket with it.
The rattling thing is another matter. Do you think it is the water pump that is rattling? Does it ever drip from under your engine all the time?
Hope this helps... Good luck!
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I might need a little more information to accurately diagnose situation but I always like to start with the thermostat.(touch top radiator hose if it is cool with temp reading high its probably thermostat) This device is supposed to open up when the engine reaches operating temp. to allow coolant to flow. If it is stuck it could easily cause the overheating condition you are experiencing. Some more info such as does it only overheat when sitting still or will it overheat when moving down the road. If only when sitting still I would suggest a problem with the cooling fan. If it is a gradual increase while driving based off the age of the vehicle I might suspect a clogged radiator. If this dont help try telling me more about it and I will be happy to provide more insight.
Does it heat up and overheat very quickly after you start driving , if so , probably thermostat.
If you are driving down the road and the temp is good , then you stop in traffic and car heats up , then probably cooling fan not working.
If it heats up slowly , then just keeps getting hotter till it overheats , then radiator problem.
Is is realy overheating , or is the guage just giving a false reading ?
something is strange here thats for sure ,firstly take thermostat out and put it in a saucepan of water and boil it to see if opens .,check the oil light switch and pull the rubber boot cover back to see if any oil is behind it ??.-You are buying trouble with a car with such a high mileage on it ,never buy anything with more than 50,000 miles or you are just buying someones rubbish
You might have a sticking thermostat. If it's sticking shut, it won't open when needed and the engine will overheat. Even though the water in the radiator is not hot then, the water in the block of the engine is boiling.
After that overflow, the cooling system was underfilled, so when the thermostat finally did open, it had plenty of room to refill, which is what you saw when the water got "suddenly sucked in".
My recommendation is to replace the thermostat (and gasket), because as a point of diagnosis, it is a relatively cheap part but can have terribly inconvenient consequences when malfunctioning. If you're handy, get a Haynes or Chilton manual from the auto parts store and do it yourself.
Also, the radiator cap is not good to mess with when the engine is hot. Doing as you did by opening it while overheated upsets the balance between the coolant in the block and radiator. There's a small rubber hose from the top corner of the radiator to a plastic (probably translucent) overflow tank on one side of your engine compartment. Under normal circumstances, you should check the coolant level there, as it exists to keep the system in balance. Note that I said "normal" - which means anytime it hasn't overheated to the point of leaking out of the radiator cap or leaking elsewhere.
MIne did the same thing it overheated going up in the slighest hill or pulling the littlest of trailers i replaced the radator and now i can go up any hill or pull anything without it overheating,first i changed the thermostat and sensor then clutch fan i even put a aux fan in in ,none of that helped after i changed radiator it did the trick hope this helps my truck was a 95 f350 with a 7.5 460 in it
Most likely not. Pulling the thermostat will get you home, but not a great fix. Is it overheating driving down the road or sitting still? If it is overheating driving down the road, look for a clogged radiator or stuck thermostat. If it overheats sitting still, look for your cooling fans not coming on.
Its overheating when you go up long hills because the engine is not getting adaquete air in the system. The radiator is angled to get optimal air a certain way. It may overheat but you shouldn't start seeing smoke.