Radiator fans / overheating - Mazda Forum
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post #1 of 11 (permalink) Old 05-25-2004, 11:43 AM Thread Starter
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I read a post here with this problem but now I can't find it to save my life.

I just bought a 98 Millenia with about 68K on it.

I recently drove about 220 miles one way and at the end of the trip it seemed like the engine was really hot and stayed that way for several hours after I stopped. The temp gauge never went above the middle of its range but I could hear a sound like the rods were clunking around when I was driving at low speed (through the parking lot). I assumed it might be because the oil had been thinned out by high temp?

It seems like the fans aren't coming on except when the A/C is turned on.

I changed the coolant temp sensor but the fans still don't seem to run when the A/C is off.

Any suggestions?
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post #2 of 11 (permalink) Old 05-26-2004, 08:43 PM
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****GET THAT CHECKED OUT ASAP!!!!!!! The fans should be working when the temp gets above the mid mark, If the previous owner overheated the car the heads may be warped which will cause the car to overheat all the time. Mind you this is a very costly repair. With warped heads the car seems to run fine but it is not. Also have the cooling system checked , Incorrect level or air in system will cause the car to run hot.
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post #3 of 11 (permalink) Old 05-27-2004, 09:48 PM Thread Starter
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I will have it checked if I can't figure it out. Can you think of a reason why the fan wouldn't run except when the AC is on? I don't think that it's the relay since the fan wouldn't come on with the AC if the relay was bad.
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post #4 of 11 (permalink) Old 06-01-2004, 10:14 PM
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Your fans may be okay. There are two fans: the Condenser Fan (passenger's side of radiator), and the Main Cooling Fan (driver's side of the radiator).

The test procedure for the fans is:
1. Start the engine and run it at idle.
2. Turn A/C switch on.
3. Do condensor and main cooling fans operate? If yes, fans are okay.

It seems like your car is doing that, so it passes the test.

Other things to check for overheated engine in the Millenia:
1. Improper coolant level.
2. Coolant leaks.
3. Improper water/anti-freeze mixture.
4. Poor radiator condition.
5. Damaged radiator hoses.
6. Improper or damaged radiator cap.
7. Malfunction of coolant overflow system parts.
8. Drive belt damage.
9. Blown fuses.
10. Excessive pressure of A/C system.
11. Fans reverse rotation.
12. Thermostat malfunction.
13. Condenser fan inoperative.
14. Main cooling fan inoperative.
15. Improper tension of drive belt.
16. Relays inoperative.
17. Water pump inoperative.

It seems that #13 Condenser fan, and #14 Main cooling fan are operative from what you describe. Check the other items on the list.
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post #5 of 11 (permalink) Old 06-01-2004, 10:27 PM
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Quote:
Originally posted by Platinum Miller cycle@May 26 2004, 07:43 PM
heads may be warped which will cause the car to overheat all the time.
why does the car overheat with warped heads?
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post #6 of 11 (permalink) Old 06-02-2004, 11:37 AM
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You would really have to overheat the engine alot before the heads warped, and maybe even throw a bucket of cold water or drive threw a big puddle while the engine was overheated to warp/crack them.

Usually what would happen before that would be the head gaskets would blow. Then steam/water would seep out of the gasket and steam up the engine compartment, also steam/water could seep into the combustion chamber where you would then see it coming out of the exhaust pipe and could potentially damage the pistons if alot of water was pouring in.

Hopefully that is not the case with this person's Millenia, it's probably overheating because of one of the other reasons.
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post #7 of 11 (permalink) Old 06-03-2004, 03:59 AM
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have them check out the vacume hose/valve

if you have a leak somewhere it will draw in warm air from the engine compartment and **** with the engine when it gets hot.

this is what happened to me

good thing a replacement valve was only $30
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post #8 of 11 (permalink) Old 06-03-2004, 04:47 PM
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no, my question was WHY does it overheat all the time if the heads are warped
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post #9 of 11 (permalink) Old 06-13-2006, 08:34 PM
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'Why does it overheat if the heads are warped?'

Because warped heads increase the amount of engine friction and wear exponentially.

DaimlerChrysler Manual Transmission Engineer by occupation.
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post #10 of 11 (permalink) Old 10-11-2006, 07:17 PM
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I have a question about overheating. About 6 months ago, my car overheated due to a hose leaking. I've replaced the hose, but now the temp. will come up to 3/4 every now and again (very random). The fluiod level is full and I can't figure out why it's doing this. Any suggestions?
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