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Just changed thermostat on 2003 1.6 petrol engine focus. When i start car the temp gauge goes straight into the red then fans kick in and drops to normal any idea why?

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Some air trap inside the radiator and engine look 4 the bleeder nipple..or look the most upper hose the remove fill water until the water flow is solid..

Posted on Aug 29, 2010

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I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Mar 12, 2015 | 2002 Dodge Grand Caravan

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1998 BMW 528 recently replaced radiator, water pump & pulley temp gauge sat middle all good THEN 2 months after all this temp gauge goes past middle then dropped back to middle . Next day temp gauge...


It could be the thermostat but you need to check the fluid level and for any leaks (these could even be pin hole) first. If you have one of those infra-red temperature gauges you can check the temperature of the cooling system in the engine bay to double check. Generally the engine temperature should not go much about 90 deg C - this is when the electric cooling fans kick in - are these turning on?

Feb 05, 2013 | Cars & Trucks

2 Answers

00 Ford Focus runs cold


Am sure you have a thermostat stuck open, i suggest replace it and make sure the aantifreeze is in the correct level.

Dec 09, 2011 | 2000 Ford Focus

1 Answer

My temp gauge on the dash started showing the car getting hot as I sit with the car running. When I started driving it goes down. I figured the thermostat was sticking so I replaced it and now the...


Check to see if the fans are operational, anything below 35 MPH the fans cool the radiator, anything above is cooled by air passing thru rad.

Jul 08, 2011 | 2003 BMW 325

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My SVT FOCUS temperature gage keeps going to the red. I changed the thermostat and it's still trying to overheat. I have a Haynes book on FOCUS 2002 to 2005 however; it does not explain how to change...


The radiator fan is most likely to blame. When the temp goes above the normal level the fan should kick on.. If it does not, you need to troubleshoot the rad fan. (Under hood etectrical box, fuse / relay/ etc.)
Also there are 2 of them (fans). The 2nd one is a booster for when the AC is on, to dissapate more heat. Try turning on the AC and see if 2nd fan kicks on. This can often help prevent serious overheating.
Good luck.

Jul 06, 2011 | 2002 Ford SVT Focus

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 2003 toyota sequoia temp goes up when outside temp is very hot.Mya.c will shut off then kick back on and repeat. After about 4 min the temp gauge goes up and heater kicks on .What could be causing this?


if both fans are working normally... you need to check radiators (both engine and A/C: start with the big one.. could be dirty blocking flow of coolant!)
good luck

Aug 27, 2010 | 2003 Toyota Sequoia

1 Answer

Dash temp guage goes to red on 2000 ford focus dohc zetech


Because you have done so many repairs already I would most likely say that the gauge is defective. I would use a manual temp probe and probe the coolant temp after the car has reached operating temp. Coolant will be between 180- 230 degrees. If coolant temp checks out and you can see coolant moving in radiator and the vehicle does not overheat then you will need either a gauge or a coolant sensor. To locate the sensor it should either be mounted in the thermostat goose neck housing or the intake manifold.

Jul 31, 2010 | 2000 Ford Focus

1 Answer

Temp gauge goes into RED at 3000 revs and/or under load/acceler..


sounds more like a weak spring in the thermostat....not keeping the thermostat open fully under high water flow (like in higher rpms)

Feb 22, 2009 | 2000 Ford Focus

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