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Car Forum / Ford / Ford Trucks / March 2007Odd temperature behavior
My 1999 Ford Ranger 4x4 has been exhibiting strange temperature behavior lately. Normally, as the engine warms up the temp gauge moves slowly up and stops in the center, and stays there. Recently the as the engine warms the temp gauage moves up and continues past the center point, going almost all the way to the H end. A couple of times the GAGE light comes on. This lasts only for a few moments, then the gauge moves down toward the center. It dips low for a while then comes back and eventually settles in the middle or near-middle. The thermostat failed once and was replaced. Then the temp almost remained low. I know that the thermostat controls a valve which lets the coolant into the engine. The engine is allowed to come up to temp with no coolant. Then the thermostat opens the valve and keeps the engine at temp. Are there any ideas as what is happening? It has been very cold here as of late, single digits, teens. I guess that the valve is sticking and not opening immediately. Or the coolant is partially freezing. It is full. >My 1999 Ford Ranger 4x4 has been exhibiting strange temperature >behavior lately. Normally, as the engine warms up the temp gauge moves [quoted text clipped - 15 lines] >and not opening immediately. Or the coolant is partially freezing. It >is full. sounds like the thermostat is the problem again >My 1999 Ford Ranger 4x4 has been exhibiting strange temperature >behavior lately. Normally, as the engine warms up the temp gauge moves [quoted text clipped - 15 lines] >and not opening immediately. Or the coolant is partially freezing. It >is full. You have a sticking thermostat. It will shortly completely fail causing a constant problem. Bite the bullet for a new one ASAP. I have also seen a bad rad cap do this if it is dumping pressure suddenly. Both are much cheaper than an engine. Lugnut > >My 1999 Ford Ranger 4x4 has been exhibiting strange temperature > >behavior lately. Normally, as the engine warms up the temp gauge moves [quoted text clipped - 25 lines] > > - Show quoted text - Thanks for responing. With a warmup over the last few days, the temp gauge operation has gone back to normal. Maybe the extreme cold temps had an effect. I'll continue to watch the gauge. But as long as I don't see it go higher than normal, I should be OK. >> >My 1999 Ford Ranger 4x4 has been exhibiting strange temperature >> >behavior lately. Normally, as the engine warms up the temp gauge moves [quoted text clipped - 32 lines] >continue to watch the gauge. But as long as I don't see it go higher >than normal, I should be OK. It may be that in the warmer weather, your stat is not closing as tightly allowing it to respond more normally during warmup. It is likely that it will eventually start to stick even in warmer weather. The problem is that the stat is sticking closed until the temp goes beyond the calibrated position causing the engine to heat too quickly before it snaps open. Keep in kind that the temp sensor on your engine may be past the stat position which means the engine may be overheating even before the guage will show overheating if the coolant is not actively flowing as would be the case with a stuck stat. Lugnut |
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