Question about Cars & Trucks
Losing antifreeze, temperature gauge starts to climb but then returns to normal and goes back and forth like that. Heat is intermittent...sometimes working, sometimes not. I have replaced thermostat, water pump, cooling flange, and timing belt so far.
The rising and falling temp gauge indicates a low water level in the cooling system as hot water is splashed against the sender . Have a pressure test done on the coolant system and find the leaks . Remember to check inside in the heater core as well. Have a compression test done to check for head gasket and cracks
Posted on Feb 14, 2014
Testimonial: "Thank you for your input. Update...discovered a crack in the overflow reservoir and replaced it today. Drove the car from the repair shop to home (about 20 miles) and when I checked under the hood antifreeze level was right where it should be. No longer smelling antifreeze when I shut off the car, BUT on the way home from work tonight the car seemed to be taking a longer time than usual to get to normal operating temperature (according to gauge). Finally it did reach the 1/2 way mark, then suddenly started going backward towards the 1/4 mark! For the remaining two miles of the trip the gauge would inch up toward the 1/2 mark, then go back down toward the 1/4 mark. No overheating that I could tell, plenty of heat coming from vents, the only symptom was what the temp gauge was doing. Is this normal?"
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Posted on Jan 02, 2017
When you say not leaking antifreeze has your coolant level gone down at all? and is it that you have seen no leaks where you park it? What worries me is you can smell it when warming up, have you felt the interior floors to see if damp and do you get any condensation if put blower onto screen, if so then heater matrix is leaking if not could be down to headgasket and/or cylinder head leak.
Posted on Dec 11, 2008
SOURCE: ford ranger truck overheating
I have had this happen with my ranger. Changed everything I could to try to fix the over heating. It turned out that I had a small leak in my head gasket and it was allowing exsaust gas to go into the cooling system witch was over pressurizing it. Also the air from the exsaust will heat up much faster than liquid making your thermostat to read hot and will not be able to blow hot air in the cab because there is no liquid going to the heater core. This happened to me when my blet came off and I tryed to make it home. If you had it over heat for a long peirod of time it may have ripped the head gasket.
Posted on Feb 21, 2009
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What you describe is quite normal. While the engine is running and the coolant is circulating the thermostat maintains the engine within its operating temperature range. When the engine is switched off there is still considerable heat within the engine and the coolant will continue to absorb this heat. With no coolant circulation, the coolant inside the engine will register a temperature rise to the extent your gauge measures. This temperature rise may persist for up to 15 minutes until the natural thermo-syphon of the cooling system starts to dissipate this heat build up and the engine starts to cool down. Because the cooling system is pressurised, the coolant is prevented from boiling off at this temperature above boiling point. Once the engine is restarted the coolant flow is re-established taking this excess heat from the engine and the system temperature returns to normal.
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