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01 Grand Am overheats in traffic only. 2 new thermostats, new cap, new fluids. 2 mechanics looked at it. One says nothing wrong, other says computer is not communicating with fan all the time. Sometimes it comes on at 225 degrees other times not at all. Dealership (his mechanics) believes 1st mechanic and says nothing is wrong. Well, Im tired of picking my kid up off the hwy and towing the car home on a weekly basis! Any ideas. BTW mechanic 1 says cars dont overheat until they reach 300 degrees! Yup! Need help!

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  • Cars & Trucks Master
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Engine cooling fans should turn on at 190 degrees if not check cooling fan fuse and relays in the engine compartment next to strut shock tower on driver side look inside fuse relay cover it will show you fuse and relays location.now if engine only overheat at a long stand still or long traffic line a faulty engine coolant temperature sensor will cause coolant fans not to turn on.

Posted on Nov 28, 2012

  • Jonah Oneal Nov 28, 2012

    check coolant level in coolant overflow jug, if low coolant system has air in it,if coolant low in overflow jug,pour coolant until coolant level stay on full cold mark.when coolant stop dropping put radiator cap back on overjug crank vechicle let it idle for few minutes until engine start to warm look at temp gauge when temperature start climb turn off engine wait until engine cool if coolant low in overflow jug add more coolant in overflow jug until stay at full cold mark. then put radiator cap back on over flow jug start engine until warm up watch temp gauge temperature start rising a little turn off engine wait until engine cool down 30 minutes to keep from getting scaled. use large rag to remove radiator cap protect hand from scalding but just open radiator cap a little at a time. do this procedure until coolant level in coolant overflow jug dont drop and stay at cold mark meaning air is out of cooling system this procedure easy way bleed coolant system if coolant level get low or you replace any radiator parts but if coolant system wont low in overflow jug more likely engine coolant temperature sensor bad if engine overheat at a stand still. if vechicle overheat while driving you have faulty thermostat or leaking head gasket.if you see coolant leaking at water pump the water pump bad.

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I'm sorry your having problems. Specially with your kids in the car. Puts you and them in a dangerous situation. Both of them are obviously wrong. Waters boiling point is 212 degree *F. Pontiac grand am engines are notorious for cracking the cylinder heads. When the cylinder head warms up so does the crack and causes it to expand. This can cause the engine to over heat. The reason it doesn't over heat going down the road is because air flow outside moving the heat away from the engine. I hate to say this but honestly no matter what is wrong with your car. It's normally somewhat costly. But not always. Between what you are spending on towing bills and bad diagnostic. It's costing you more than you would have spent to fix it twice correctly. You need to have the engine and cylinder head pressure tested for leaks. You can check your oil and see if there is any coolant mixed with the oil. If so. Your head gasket is blown and leaking or cylinder head is cracked. The oil will look like black coffee with a lot of creamer in it. Kinda brownish color. Check that first. Also visually check to see if there is any stains on your cylinder head and engine block. These can show you where the coolant is leaking out when it get hot. Your car has a aluminum block and head and it expands and contracts with heat. Hope this helps. But it can literally be so many things. Lets hope for the best though.

Posted on Nov 27, 2012

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Posted on Jan 02, 2017

demonram440
  • 42 Answers

SOURCE: '97 Grand Prix 3.1L...Head Gasket? Manifold? Control Module?

Hi Melody- it feels like you could be right. it feels like your car was well worn when you got it. common causes of overheating are coolant too low, which is what i suspect was the case when you first got it. a stuck closed thermostat not allowing coolant to circulate. i assume you have an electric cooling fan- check to see if your fan motor is fried. you could also have large air pockets inside your cooling system which can give false coolant level. when you pour coolant into your radiator rather than your overflow tank, you introduce air into the cooling system that has to be purged by allowing the bubbles to work their way out through your radiator by squeezing your coolant hose you can assist the escape of these air pockets (with engine running) evidence of a cracked head can be presence of coolant in your engine oil-pull your oil dipstick and look. you say no evidence of coolant leakage, however, look underneath your car and check to see if there is coolant splatter surrounding the underside. it maybe that your car is maintaining enough pressure to run but when engine temps reach a point to where the radiator fan should kick on, and/or the thermostat should open to allow coolant flow and these things dont happen-the result is what you describe with no power and overheating that will eventually overstress your head(s) warped heads can cause the symptoms you describe. you can perform a compression test to help pinpoint a blown cyl. an idea for fixing your car for cheap would be to take it to your local high school auto shop. the only way kids learn the trade is by subject cars. ill bet you can even arrange them to pick it up. the will fix your car for cost. you would only need to supply whatever parts are needed to make the repair. its a win-win situation because they get to learn by fixing your car and you get to use your car for doing mommy things without fear of labor fees. which are around $120/hr. I hope i have helped you with your car good luck!

Posted on Feb 12, 2009

  • 73 Answers

SOURCE: had my acura tl overheat brought the vehicle into

Keep an eye on your temp gauge, check your radiator fluid daily for a week (or until you're comfortable that the mechanics fixed the issue), and pay attention to odd smells (radiator fluid). A bad seal on the radiator cap would allow fluids to leak out, so hopefully you're all set now.

Posted on Jun 30, 2009

smartr10U
  • 1305 Answers

SOURCE: Engine overheats

As you probably know, you're not alone in this. There's many reports of the PT's overheating.
In my research, there's a couple of things that you haven't mentioned that are worth checking.
1. Have a pressure check done on the cooling system. This will possilbly show you a leak in a head gasket that could be allowing coolant into the the cylinder, or exhaust.
Another way to check is there's a test kit that can check if there's combustible/emission elements in your coolant- one of the above tests would be worth doing to see if with all the overheating if the cylinder head may have warped and allowed leakage at the head gasket.
2. There's alot of talk in the forums about the fan motor on your car. Apparently this fan is a 2 speed unit and even if the fan is working it may only be working on the lower speed. The fan contacts tend to wear out and it may be on yours that the low speed is working, but the high speed may not be.
Good luck on this... seems to me that with this much of a problem there would be need for a dealer recall..

Posted on Sep 19, 2009

Testimonial: "Thanks. I'm puzzled and frustrated. I've spent hundreds of dollars with no real relief. Other PT Cruiser owners hav the same problem. "

  • 1 Answer

SOURCE: 1994 Toyota 4Runner Overheating

I had the same problem - my 95 4Runner would overheat in 4WD only, and coolant would bubble out and spill over.

The problem turned out to be with the rear heater tubes and the fan clutch - my mechanic bypassed the rear heater tubes and I have no more problems. Not exactly sure why this helped. To replace the rear heater tubes, it would've cost $325, but to bypass cost $75. Most people don't even really use the heat in the back seat.

The second part of the problem, and most important, was the fan clutch needed to be replaced. At low speeds, it wasn't kicking in when it should have been, only working at higher speeds. Once I replaced the fan clutch and the bypassed the rear heater tubes, all has been well.

Hope this helps!!

Posted on Jan 25, 2010

  • 161 Answers

SOURCE: My 2000 Jeep Grand Cherokee overheats in traffic

Check the fuse for the fan and use a test light to make sure that the circuit is functioning. Warm up your car then feel along the top and bottom of the radiator to check for cold spots. If you find any then you may need to replace your radiator. If your heater isn't currently working it may be that since it is a part of your cooling system.

Posted on Apr 29, 2010

Testimonial: "Thanks for the info!!!!!!!!!!!!!"

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