Question about 2000 Pontiac Montana

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Cooling fan fails to turn on so it gets too hot in traffic

Cooling fan does not turn on so gets hot in traffic , no problem on highway

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  • jenstewfam May 18, 2009

    where is the temp switch to be found

  • Dale Long May 11, 2010

    check the fuses and the fan relay.

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Because its air cooling need to check the temp switch and the relays for the fan under your hood

Posted on May 16, 2009

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My 2004 3400 closed system ,runs hot in town unless heater is on. driving up a mountain pass it gets very hot.on a flat highway runs normal. new t state,resivior cap, both fans work no leaks or smell


Radiator fan motor or radiator fan thermostat defective/

Also there is a relay that operates the fan motor

In town not enough air passing through radiator allowing it to over temp.. With heater fan running acts like cooling fan keeping engine cool

Highway driving ample air passing through radiator without fan.

Hill climbing requires cooling fan/

Hope this helps?

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Nov 17, 2016 | Cars & Trucks

1 Answer

My pajero is overheating afew minutes after starting what could be the cause?


An overheating engine is more than a bummer, it can be an expensive engine killer that will leave you on the side of the road, then on to the repair shop for an expensive repair bill. If your car has been running hot, you know the feeling. You're sitting in traffic, the light turns green, and you pray that traffic breaks enough for you to get some air flowing over the radiator so that engine temperature needle will go down just a little bit. It's beyond stressful, and there's no reason you should be forced to endure this. The fact is, there are only a few things that commonly cause an engine to overheat regularly. 1. Low Coolant By a large margin, the most common cause for engine overheating is simply a low coolant level. Your engine's cooling system relies on coolant to circulate and remove heat from the engine. If you don't have enough coolant in there to do the job, heat will build up and your engine will overheat. No amount of running the heater in the summer will help if you don't have enough coolant in the radiator to transfer that heat. By far, the first thing you should do if your engine seems to be running hot is check your coolant level. 2. Electric Cooling Fan Failure If you have an electric cooling fan that isn't coming on, this can cause your engine to overheat. The electric cooling fan draws cooler air through your radiator when your car isn't going fast enough to ram it through from the front. You can test this by letting your car idle long enough for the engine to heat up. If you've been having an overheating problem in traffic, keep an eye on your temperature gauge. When it starts creeping into the danger zone, look under the hood to see if your electric fan is running. If it's not, you'll need to figure out why. There are two usual causes to this:
2a. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. To test this, find your radiator fan switch and disconnect the wiring harness. Get a jumper wire and insert it into both contacts, your fan should come on. Another way to test the fan is to turn on the air conditioning. Most, but not all, cars activate the cooling fan at either a medium or high speed when you turn on the AC.
2b. Bad Radiator Fan Switch: There is a switch that tells your cooling fan to come on when your coolant reaches a certain temperature. The easiest way to test this switch is to disconnect the wiring harness and then run a jumper wire across the harness contacts. If the fan comes on, you need to replace the switch. 3. Thermostat Not Opening The most common symptom of a failed thermostat is overheating at highway speeds. Your engine may be able to stay cool at low speeds because it's not working that hard, and therefore not creating as much heat. But at highway speeds your engine needs lots of coolant flowing through. If the thermostat doesn't open, there isn't enough flow to keep things cool, and you'll find yourself looking more like a steam ship than a sedan going down the highway. 4. Broken Fan Belt There are still lots of engines out there which have a fan belt to drive the engine cooling fan. If you see a belt attached to your fan, you're in this club. The good news is your repair is always cheaper than the electric guys. You can replace your fan belt easily if it's broken. 5. Clogged Radiator If your car has more than 50,000 miles on it, your radiator could start getting gummed up. You can avoid this and other problems associated with old coolant by flushing rad every year.

Nov 26, 2013 | Peugeot Liberte Cars & Trucks

1 Answer

The radiator fan on my 2007 bmw 525i works fine while car is driving. Once i stop at a red light or in traffic the the fan stops working, ac blows hot air and mins later the car overheats. The car has a...


My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.

Nov 04, 2013 | BMW 525 Cars & Trucks

2 Answers

My car is running hot what can it be


THERMOSTAT , RADIATOR, HEATER CORE,ANY ONE OF THESE COULD BE THE CULPRIT
good luck

May 15, 2013 | 1997 Cadillac Eldorado

1 Answer

Where are the cooling fan relays located on a 1998 Mazda Protege?


cooling fan has a heat sensor that controls it and is located on the engine...correct place on that car i do not know but local auto parts store should be able to help you out as to location....hope this helps

Aug 17, 2012 | 1998 Mazda Protege

1 Answer

Engine runs hot after a few minutes of running the car


That is very vague. Have you checked the radiator, and when it is hot does the electric cooling fan come on? Try running the A/C and see if the cooling fan comes on. Does it run hot on the highway or just in city traffic? I need some more details to try and narrow it down. There are many things it could be. Low coolant, stuck thermostat, air in the cooling system, bad fan motor, fan motor relay (also known as fan switch), or temp sensor.

Jul 17, 2011 | 2000 Oldsmobile Intrigue

2 Answers

I have a o4 saturn. the fan isn't working. we


The problem could be a bad coolant temperature sensor.

Aug 12, 2009 | 1993 Saturn SC2

3 Answers

Car gets hot when i idle..


change your thermostat it may not be opening all the way

Feb 25, 2009 | 2003 Buick Century

1 Answer

My car is falling apart


Overheating in traffic and then running fine on the highway is a reasonable sign that the radiator fan is not working, it gets hot in traffic and the fan doesn't come on, then on the highway the forced air through the front grille will be sufficient to cool the radiator down.
The fan not running can be one of four things.
1. the fan it self dead.
2. The radiator thermal switch.
3. The relay for the radiator thermal switch.
4. The fuse blown.
The fact that it stalled when it was getting hot could be one of a number of things including the gasoline evaporating simply because it was getting hot.
The fact that you cannot start the car up now leads me to suggest you have an electrical problem that is common to both situations.
If I had to hazzard a guess I would suggest that whatever is stopping the radiator fan running has probably just knocked out your fuel pump.
You need some specialist diagnosis on this car, time to call the garage I am affraid.

Aug 08, 2008 | 2002 Kia Rio

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