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Tim West
Tim West, ASE Certified Technician
Category: Car
Satisfied Customers: 4638
Experience:  ASE Certified Service Manager for Bridgstone/ Firestone
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2001 Mitsubishi Montero: that is overheating..guage

Resolved Question:

I have a 2001 Mitsubishi Montero that is overheating. The temp. guage is hitting H within minutes of starting. .8 miles and overheat. There is no apparent leak under car. The thermostat has been changed twice. All hoses look fine, changed cap, oil cap has no milky residue, fan working, passenger side footwell dry, when engine cut off the reserve tank bubbling and hissing sound stopped within seconds??
Submitted: 6 years ago.
Category: Car
Expert:  Tim West replied 6 years ago.
Thanks for visiting Just Answer,
This sounds like a problem with air getting into the system. When you turn the vehicle off and it starts bubbling over the coolant tank is a good indication.
After you replacd the thermostat did you properly bleed the air from the system?
Customer: replied 6 years ago.

Hey Tim,

Yes, it was bled.

Expert:  Tim West replied 6 years ago.
Thanks, XXXXX XXXXX appears to be a leak somewhere in the system. Try this, bypass the heater core. Use a clear tube and connect to the heater hoses. Use a clear hose so you can look at the flow of coolant. If there is air in the bubbles, either it isn't bled correctly or the head gasket is blown. If coolant ins't flowing through strong enough the water pump is bad. If everything is ok after bypassing the heater core, replace the heater core.
Customer: replied 6 years ago.
Wouldn't there be milky residue on oil cap if head gasket?
Expert:  Tim West replied 6 years ago.
No not always, that is a common mistake made. Milky susbstance is a good indication of a blown head gasket but it's not a guarantee reslult from blown head gasket.
WIth as much air as it sounds you have in the system, it would be a bad idea to ignore the possibility of a blown head gasket. (As much as I hate saying that to someone) ].
Especially if the engine has overheated before.
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