Question about 1999 Mazda Millenia

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What cause your car to continue to run hot after you have put on a new thermostat and new radiator.

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  • Mazda Master
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Timing to far advanced or the timing belt is on wrong and its too far advanced that way ,ie valve timing alighning with marks but when belt tighted on tensioner the crank has moved

Posted on Sep 11, 2010

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Posted on Jan 02, 2017

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SOURCE: thermostat radiatot

look for bleeder valve on thermostat housing or other coolant hoses or lines. possible traped air in cooling system,will cause car to run hot.

Posted on Jul 27, 2008

dttech
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SOURCE: I have a 92 Acura

Thermostat improperly installed. (backwards) Or possibly you could have a blown head gasket and a bad thermostat at the same time. The head gasket could be letting exhaust gasses into the cooling system. A bad (stuck open) thermostat could "mask" this problem by allowing the coolant to circulate through the radiator when it is not supposed to. Thus, installing a new thermostat would trap the exhaust gasses in the cylinder head and cause the overheating.

Posted on Feb 06, 2011

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1 Answer

Why is my honda passport running hot?


The most common cause other than what you have replaced is a leaking head gasket.
Could also be a coolant flow problem inside the engine, or air flow thru the radiator.

Sep 05, 2014 | Cars & Trucks

1 Answer

I have a 92 Acura Legend L V6 engine. My acura had been running hot until I put a brand new radiator on it, I drove the car for appro 40 miles one way and back, still didn't run hot. The car heater...


Thermostat improperly installed. (backwards) Or possibly you could have a blown head gasket and a bad thermostat at the same time. The head gasket could be letting exhaust gasses into the cooling system. A bad (stuck open) thermostat could "mask" this problem by allowing the coolant to circulate through the radiator when it is not supposed to. Thus, installing a new thermostat would trap the exhaust gasses in the cylinder head and cause the overheating.

Feb 05, 2011 | Acura Legend Cars & Trucks

1 Answer

I put new thermostat on and it started running very hot again. I drilled to holes in the thermostat to increase the water flow and it still ran hot. It's weird cause the bottom radiator hose was running...


Flushing a radiator at home is most often a waste of time. The chemicals used by a radiator shop are far stronger than anything you get at the parts supply house. What happens is that the flow you see is deceptive as the water tends to flow around a partial restriction and does nothing to remove it.
Though your garden hose has a lot of pressure it doesn't have the volume necessary. A garden hose will usually be sufficient to flush out a heater core though as it's smaller.
Have a radiator shop flush your radiator core and have a hydrocarbon test done on the cooling system to eliminate the possibility of head gasket problems. When re-filling the system, turn the engine off just before it reaches 210 degrees and let it sit for a few minutes so the thermostat can open, then continue filling. Always fill with the heat on high. Thermostat goes in with the spring end into the engine.Forget about the water pump...unless you got one made for a twin engine marine (CCW) application it has nothing to do with the problem though I've heard but never actually seen that the belt can be installed so it turns backwards.
When the engine is at operating temp cover the grille and force it to nearly go into overheat...the electric fan should come on and the mechanical fan should lock up to try to counteract that.
Don't open the system when it's hot (you found that out already). And, don't allow the engine to actually overheat.
My bet without seeing it? Likely a partially obstructed radiator. 4.0 engines make a lot of rust residue even when maintained. If that's what you have in there, or even the 4cyl. It is more than likely.

Jan 19, 2011 | 1989 Jeep Wrangler

1 Answer

Have a 1993 toyota paseo it keeps running hot change out radiator and house it does not have a tremostate could that be making it run hot


An explanation of the cooling system.
You start your car, it is cold at first. The thermostat is shut. Car warms up and raises the temperature of the coolant in the engine block. Thermostat opens up. Water from the radiator (cool) is exchanged for water from the engine block (hot) The cool water causes the thermostat to shut. This traps the hot water in the radiator so that it can be cooled down. The cool water that was exchanged for the hot water, now becomes the hot water because it is in the engine block. It heats up until it's temperature causes the thermostat to open again, exchanging cool water for hot water. If you have no thermostat, then you will never hold water inside your radiator. You have to hold it there to allow it to cool off, then it becomes useful to cool your engine. So, yes put a thermostat back in it, and please vote as to whether this was helpful or not.

Nov 23, 2010 | 1993 Toyota Paseo

1 Answer

1998 Pontiac Sunfire Symptoms: -Overheating


What are you going by to say it's overheating , temp gauge ? Have you test to see what the actual temp. is > Hook - up a scan tool ,what's the PCM - engine computer seeing for engine temp. ? 223 degress the PCM should turn on the cooling fan . You could buy a Non-Contact Infrared Thermometer With Laser Targeting at harbor freight ! Radiator very hot ????? What is the right temp .
Non Contact Infrared Thermometer With Laser Targeting

Could be a bad temp gauge . Is the coolant surging inside the cooling system ? Does it have a radiator cap ? Have you replaced it ?

May 06, 2017 | 1998 Pontiac Sunfire

1 Answer

Engine overheating, high temperature indications. Examine/Replace water pump, check radiator and continue to run hot after 30 minutes of driving.


There is a blockage in the engine coolant path causing insufficient cooling. When the coolant flows, it removes the heat produced from engine combustion to radiator to cool. If there is no flow then the coolant becomes stagnant, therefore the heat is built up without being dissipated to nowhere hence the engine gets overheated. If this is not fixed then the heat will cause the head-gasket blown due the the metal expansion.
Repair at this stage becomes very expensive.
1- Take off the thermostat.
2- Put back the hose connection.
2- Run the engine and feel the upper hose to see if cooling flowing through it.
4- IF Yes. Run engine like this for few days, if no over heat , buy a new thermostat and put it back. Your problem is resolved.
5 IF No. You have a bad radiator. It clogs up so you don't feel the cooling flowing. Buy a new radiator, don't ever use a rebuilt one.
Good luck.

Aug 14, 2010 | 2006 Cadillac STS

3 Answers

Car is running hot


You need a new radiator if it only does it with the A/C on. It means you don't have enough cooling capacity anymore to handle the extra heat from the A/C.

Aug 14, 2009 | 1995 Lexus GS 300

1 Answer

Thermostat radiatot


look for bleeder valve on thermostat housing or other coolant hoses or lines. possible traped air in cooling system,will cause car to run hot.

Jul 26, 2008 | 1995 Mazda Protege

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