still overheating after radiator replacement, radiator overheating engine temperature Options

[Terzin1]

Hi all

Last week my radiator cracked at the fill neck. I replaced it with another and that seems to have gone in just fine. It holds fluid without leaks. I also picked up a new thermostat but didn't install it yet.

So... today I filled up the radiator with coolant and went for a test drive. It started to overheat again so I stopped, let it cool a bit and opened the cap to fill it and let the bubbles come out as it ran, heat was on. The reservoir was bubbling up too. I also unplugged the fan sensor so that they could run continuously just to be sure that they weren't part of the problem. Well, the fans work and seemed to slow the pace of the temp gauge rising, but I'm still overheating. Tomorrow I'll swap in a new thermostat. What else should I look for if that doesn't solve the problem?

[Nial]

I would start with the thermostat, remember with the new one, boil the kettle and put the thermostat into the water, make sure it opens. Just because it's new isn't a guarantee it's working.

I would then look at the water pump, make sure you can see / feel the water circulating, best to do this in between removing the old thermostat and fitting the new one, you don't have to wait for the water to warm up then. Put the thermostat housing back empty and run the engine for a bit, you should be able to feel the water circulating by squeezing the top hose.

While changing the thermostat I would be tempted to give the engine a good flush out, when the thermostat housing is off and thermostat removed, put a garden hose on the pipe and run it until the water runs clear, then drain as much as you can out before replacing with whatever coolant you run.