Question about 2003 Pontiac Montana

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I am have a problem with engine temp going into the red. the blower will only throw out cold air. i have replaced the waterpump, thermastat, and head gasket. if i bleed the hoses i can get the temp. to go down but after letting it set for awhile it seems to do it all over again.

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  • bruce shields Apr 02, 2011

    Have you check to see if your heater core is stopped up?


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  • 17 Answers

What about the ECT??

Posted on Apr 02, 2011

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2006 2.5 engine temp light is coming on. fan is working and coolant level is full. I`m thinking thermastat. where exactly is the thermastat located on this engine?

Is it over heating, put one hand on upper hose and the other on lower hose if ther is a big difference in temperature oh my you will have to change water pump why the propellor is plastic and have a tendency to break internally. Now hold on lets go at this step by step. in the plastic radiator there is a low coolant sensor there see if that rod pops up (do this when the engine is cold) if it is you are looking at a waterpump

Apr 21, 2011 | 2006 Volkswagen New Beetle

1 Answer

Replaced blower motor and resistor, also heater core and thermastat, and control panel in dash, still only cold air blows out.

most likely your problem is the temp blend door actuator it is a motor that moves a door in heater case to adjust temp

Dec 24, 2010 | 1997 Chevrolet Cavalier

3 Answers

I have a 2003 chevy impala. just changed the thermastat because the temperature was fluxuating. Since changing the thermastat the temperature gage constantly read in the red, however the coolant level...

You probably need to bleed the cooling system properly.

Open the cooling system bleeder screws.

Slowly fill the cooling system with a 50/50 coolant mixture until coolant runs freely out of bleeder screws.
Close the cooling system bleeder screws
Install the coolant pressure cap
Start the engine.
Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature. (midway on gauge)
Allow the engine to idle for 3 minutes.
Shut the engine off.
Allow the engine to completely cool.
Top off the coolant as necessary.
Run engine again at 2000 - 2500 RPM until the engine reaches normal operating temperature.
Allow engine to idle until cooling fans come on. It should come on with the gauge about 3/4 of the way to red. - if it gets to where is touches the red, shut down immediately.
When the fan comes on, put your hand behind the fan and observe the temperature of the air coming from the fan. It should feel hot. If it is blowing cold air, the coolant is not circulating through the radiator like it should. This could be caused by lots of things including an improper/defective thermostat, corroded water pump impeller, or a blown head gasket.

Dec 02, 2010 | 2003 Chevrolet Impala

1 Answer

My 2004 dual heater is blowing cold air on both sides of truck

you do not give enough info. is the temp gauge showing the engine temperature is normal, about in the middle or a little less. if it reds colder probably the thermastat.either way make sure the radiator itself is full. engine cold remove.remove the cap and fill wait until it settles and refill start the engine and it should go down a little morer ,fillagain put the cap back on and fill the resevoir only to its full mark.see what happens.if this is all ok and the heater hoses are both hot you will have to probably replace the temperature blend door actuator.

Feb 16, 2010 | 2004 Chevrolet Silverado

1 Answer

1990 honda accord temp gauge above hot limit.

Hi there,

Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.

The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.

So, other components which are likely to cause hot readings (in this order) are:

- lack of coolant (or leakage somewhere): is there sufficient green coolant at the correct level? Top up mixture to correct level. Repair any leaks.

- collapsed radiator hose: when engine is cold, start engine, then quickly watch both upper & lower radiator hoses to see if either begins to flex inwards (collapse). Replace if either hose is collapsed.

- bad/incorrect thermostat rating : when replacing thermostats, you must ensure it is of the SAME temp rating (they all differ).

- Incorrect Temp sensor rating: the ratings of this sensor must be within manufacturer's spec's.

- bad waterpump: the engine relies on the waterpump to distribute the coolant throughout the entire system. If waterpump is faulty, coolant will not flow quick enough, causing overheating.

If you still believe all of the above components are OK, then have your cooling system "pressure tested". This test should be done, before looking further at other electrical components.


"if this has helped you in any way, please rate this solution"

Jan 27, 2010 | 1990 Honda Accord

1 Answer

Temp. gauge is at halfway mark and heater blowing cold air

prob needs thermastat,sounds like u dont have one at all

Jan 29, 2009 | 2000 Volkswagen Jetta TDI

1 Answer

Ford focus engine managment system

I doubt its the instrument cluster. Next time it does it, turn the heaters on full hot. If the air is very hot, you could be looking at a thermostat problem. If the air is cold, then you are either losing water or your waterpump is on its way out. However waterpumps dont tend to be sporradic, so i would go for water leaking.


Dec 21, 2008 | 2001 Ford Focus

1 Answer

Blows ice cold air out of deforst

Will not be the thermostat. Most likely you are low on antifreeze (coolant). This may be caused by a leak in the head gasket or manifold. If so major problem. Check your oil to see if there is water getting into the engine. It will appear as white milky substance. If so fix immediately or lose the engine.
The other problem may be the water pump has failed. If you look at the engine you may see a lot of water (coolant) on the left side of the engine which is where the water pump is located. ( left side if you are looking into the engine compartment) If it is the waterpump you are looking at app. $200-$250 parts and labour taxes in Canadian.
I had the same problem mine was the waterpump.
Do not let the engine go into the red. If you do you are in danger of warping the head and then bigger problems

Nov 19, 2008 | 2003 Chevrolet Venture Passanger

2 Answers

No heat

No Blower in Floor Mode
A customer arrives with a 1983 to 1995 Full Size Ford, Lincoln, or Mercury
automobile with automatic temperature control. If the complaint is no blower operation when
the floor mode is selected, the vehicle may have a problem with the thermal blower lockout
switch also referred to as the CELO (cold engine lock out switch).
The thermal blower lock out switch is located in the heater core intake hose. The two
wire switch has a thermal element with a small set of contacts, the contacts are open when the
coolant is below 120°F and closed when the coolant is above 120°F. The thermal blower lock
out switch also contains a vacuum switch, which applies vacuum to the outside/recirculate
valve when the system is in the floor position. When the engine coolant is below 120 degrees
and the selector is set to floor position, the thermal blower lock out prevents blower from
turning on and closes off the outside air during engine warm-up. When the coolant
temperature is above 120 degrees, and the selector is set to the floor position, the thermal
blower lock out switch allows the blower to operate and opens the outside air door.
In order to diagnose this problem, test the thermal blower lockout switch with the
engine at normal operating temperature (above 120°F). Unplug the wire harness connector
from the thermal blower lockout switch. Using a 15-amp fused wire, jumper the harness
terminals to test the switch. If the blower comes on, the thermal blower lock out switch is
faulty. If the blower doesn’t come on, look for an open between the control head selector and
thermal blower lock out switch.
In some cases the blower may continually run even when the engine temperature is
below 120 degrees. Unplug the thermal blower lock out switch and if the blower motor turns
off, the thermal blower lock out switch is faulty. If the motor continues to run, look for a
short to power between the control head selector and thermal blower lock out switch

Nov 04, 2008 | 1988 Lincoln Town Car

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