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Hi all,
Looking for advice, I’ve got 2002 Jimny the heater is hardly blowing any hot air the top hose seems to warming up but not the bottom one also when I removed the rad cap the water looked brownish.
Rusty water in your cooling system means oxygen is in there.
Could just be lack of maintenance, where oxygen gets in over time.
Could be a leak.
I would have a look around the engine, radiator and below the centre of the dash for signs of rusty water indicating a leak.
I would top up the radiator, turn off the heater fan but set the temp to hot. Then I'd leave it running until the temp gauge showed half way. Thats when your thermostat should start opening. When it gets there the heater fan should blow hot air when you turn it on.
If you want to check the thermostat, wait until the engine is cold, remove the thermostat. Boil the kettle, drop the thermostat into a mug of boiling water and you should see it open. Best not to use your own mug but I work in a garage so there are plenty of mugs there!
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