My 1996 isuzu wizard mu 3.1 wont hold its coolant it gets hot thermostat will open then then overheats and blow water out the reserve tank

SOURCE: engine overheat , no heat in vehicle

you may have a clog or your water pump is not working.

Testimonial: "yep, was a clog in the radiator. Flushed it out with hose , works fine now .. thanks "

SOURCE: bubbling water in the water tank

typically that is caused from a bad head gasket, fluid from the engine will be forces through the radiator then boils over or bubbles. As far at the no gauge reading, you probably need a new one.

SOURCE: bubbling water in the water tank

i suggest you have ablown head gasket and possibly you need a new thermostat. a radiator service centre will be able to check the water for combustion gases for virtualy no charge and then you will know for sure.

Mike Butler

• 6674 Answers
• Posted on Nov 06, 2010

SOURCE: 1996 Legacy Overheating It has coolant and both

Costs nothing to try this, just in case coolant level was low when or after bottle changed, and you got an airlock. Start car when cold, rad cap off and heater on. Now let in run until it comes up to normal operating temperatures and rad fan(s) kick on and off, 2 or 3 times, and add coolant to proper level in rad if it goes down during process. Then after that, put rad cap back on, fill coolant return bottle to proper level and try it. Quite often when re-filling an engine cooling system, people forget to turn on heater to get coolant circulating through the heater core.

SOURCE: 2001 pontiac grand am se v6 3.4L overheats-water

is the engine fan coming on? , when the heads were removed ,were they pressure tested. u may need to use a carbon block test from the coolant tank. the liquid will turn a different color if exhaust gas is present in the coolant,which would be a internal problem