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Old 01-11-2016, 10:19 AM   #1 (permalink)
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Default 06 suzuki alto heaters cold

wonder if anyone can help me alto ticking over heaters lovely and warm then i drive the car under load temp gauge drops heaters blow cold changed thermostat heater matrix flushed water running clear both ways help
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Old 01-13-2016, 03:36 PM   #2 (permalink)
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Usual cause is a stuck closed thermostat but you have replaced it. Did you check the new one was working before you fitted it by boiling it in a pan of water to see it open?

If it is indeed working and you have free flow through the heater matrix then I would suspect the water pump to be at fault. Only other thing would be an air lock in the heater matrix preventing the flow. Raise the car at the front highest you can get it so radiator cap is highest point of engine. Run car up to normal temp and press on the hoses to force any air out, watch for burps at the filler. If this fails to expel any air then look at the water pump for faults.
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Old 01-13-2016, 04:02 PM   #3 (permalink)
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took thermostat out heaters a little warmer but not red hot ages to warm up but like i say no thermostat jacked it up a little burp nothing major water pump looking at the water in the rad have a good flow you can see it so assuming water pump ok took alt belt off spun water pump by held no grindind and you can hear it spinning through rad and hoses im going to get a genuine thermostst not a pattern part see if that helps
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Old 01-13-2016, 05:39 PM   #4 (permalink)
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Test the old stat and the replacement you got in a pan of water on the cooker boil it up and watch to see if they open and close when taken out just to check them out. Also double check how they fit in the engine some have a small vent hole in them and for some reason on some makes of cars these holes have to be in a certain position when fitted.
Not had an Alto stat out so not too sure on how they fit in.
If the old stats don't pass the boil test then try a oem replacement.
Another thing to check would be the rad cap, is it sealing ok? Might be worth replacing that as well as the stat.

Good video here explains car heaters https://www.youtube.com/watch?v=-XjXTVJhFLM
He mentions Heater control valve not sure what is on the Alto, but worth checking in case it has one and its not working as it should.

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Old 01-14-2016, 01:32 AM   #5 (permalink)
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know where that is changed that i think just in front of thermostat housing didnt look to close at thermo just binned it that pissed with it blowing cold air im getting a new one today keep you posted
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