Need help on high engine temperature indicator..

Legend91Cp · 03-07-04, 05:51 AM

Hello all. I am new to this forum but I've been driving a '91 Legend L Cpe for almost five years without any problems. However over a year the engine temperature indicator has been acting either weird or accurately like it would go up to half way at idling or low speed drive, then it came back to normal mark (2nd bottom one). Another thing when the high engine temperature was high was that the hot air was not coming out when I turned the fan on and adjusted the temperature selection to warm or hot during the cold season. Then I also noticed during the first few minutes after starting it up, the engine would rev up and down quickly (1k rpm- 2.5k rpm). After driving it for a few miles it stopped revving up and down at idle speed.

But for the last few months it has seemed to get worse as it revved up and down for a longer period of time after starting. The engine temperature has gone way up to the red mark almost 8 out of 10 times even when driving it at freeway speed, then if I turned on the fan and selected warm or hot air the scary engine temperature indicator would drop quickly to its normal operating mark and the hot air would come out of the vents. But it would do this either at the moment I turned on (or off) the fan and selected the hot air or after several minutes.

No engine check light ever came on. I stopped and checked the two electric fans when the engine temp. indicator was more than halfway mark and they did not run. The engine did feel a little hotter than usual but I am not sure it was going to overheat later. The radiator coolant is full and clean withou any leak. Everything else seems to be in working conditions but what has caused the engine temperature indicator to go high and back to normal after anywhere from first few to 10 minutes after starting up and driving.

I read the engine light codes thread that has a code 6 for engine coolant temperature sensor. I also searched for all temperature-related sensor parts (or thermostat) and found out so far there are two of them:

1) Water temp. sender
2) Thermostat (don't know for what use)

Would it be possible there is a faulty temperature-related sensor?

Any help will be greatly appreciated and sorry for the lengthly post.

Agent Smith · 03-07-04, 06:21 AM

Welcome to the board. Have you tried bleeding the air out of the coolant system? BTW - use the search button - there is a TON of info on overheating problems.

Cole Austin · 03-07-04, 06:36 AM

Hey welcome to the forum, for most people I would say just use the flashing search button up top, but you did an excellent job with posting your question, so I figured you deserve a good response.

Quote:

Originally posted by Legend91Cp
However over a year the engine temperature indicator has been acting either weird or accurately like it would go up to half way at idling or low speed drive, then it came back to normal mark (2nd bottom one).

Sofar, it sounds like you have an air pocket in your cooling system. You need to bleed out the air using the bleeder valve.

Here is how you bleed the air out of the cooling system

Quote:

Another thing when the high engine temperature was high was that the hot air was not coming out when I turned the fan on and adjusted the temperature selection to warm or hot during the cold season. Then I also noticed during the first few minutes after starting it up, the engine would rev up and down quickly (1k rpm- 2.5k rpm). After driving it for a few miles it stopped revving up and down at idle speed.

Those are the 2 major signs of low coolant in the cooling system.

Quote:

But for the last few months it has seemed to get worse as it revved up and down for a longer period of time after starting. The engine temperature has gone way up to the red mark almost 8 out of 10 times even when driving it at freeway speed, then if I turned on the fan and selected warm or hot air the scary engine temperature indicator would drop quickly to its normal operating mark and the hot air would come out of the vents. But it would do this either at the moment I turned on (or off) the fan and selected the hot air or after several minutes.

Dead give away that you have a leak in the cooling system somewhere. There are many places a leak could occur, but besides for the obvious parts, such as radiator, and radiator hoses, I would suggest getting the
Rear heater hoses looked at

Also, there is a possibility that you have a Blown Head Gasket.

My suggestion would be to read through this entire thread: Is your 91-95 Legend overheating? Got a coolant problem? Post all questions in here.

and then post any more questions you may have. I'll be glad to answer them.

Legend91Cp · 03-07-04, 07:02 AM

Thank you so much for even a few responses. I will try your suggestions and I am not familiar with my car engine and such but I am willing to DIY before giving it up to a trust worthy mechanic.

Cole Austin · 03-07-04, 07:25 AM

Its no problem, to get ya started on the right foot. Here is a picture of the air bleed valve.

03-07-04, 05:51 AM	#1 (permalink)
Legend91Cp Registered User Join Date: Mar 2004 Location: CA Posts: 4 Car 1: Legend91 Cpe iTrader: (0)	Need help on high engine temperature indicator.. Hello all. I am new to this forum but I've been driving a '91 Legend L Cpe for almost five years without any problems. However over a year the engine temperature indicator has been acting either weird or accurately like it would go up to half way at idling or low speed drive, then it came back to normal mark (2nd bottom one). Another thing when the high engine temperature was high was that the hot air was not coming out when I turned the fan on and adjusted the temperature selection to warm or hot during the cold season. Then I also noticed during the first few minutes after starting it up, the engine would rev up and down quickly (1k rpm- 2.5k rpm). After driving it for a few miles it stopped revving up and down at idle speed. But for the last few months it has seemed to get worse as it revved up and down for a longer period of time after starting. The engine temperature has gone way up to the red mark almost 8 out of 10 times even when driving it at freeway speed, then if I turned on the fan and selected warm or hot air the scary engine temperature indicator would drop quickly to its normal operating mark and the hot air would come out of the vents. But it would do this either at the moment I turned on (or off) the fan and selected the hot air or after several minutes. No engine check light ever came on. I stopped and checked the two electric fans when the engine temp. indicator was more than halfway mark and they did not run. The engine did feel a little hotter than usual but I am not sure it was going to overheat later. The radiator coolant is full and clean withou any leak. Everything else seems to be in working conditions but what has caused the engine temperature indicator to go high and back to normal after anywhere from first few to 10 minutes after starting up and driving. I read the engine light codes thread that has a code 6 for engine coolant temperature sensor. I also searched for all temperature-related sensor parts (or thermostat) and found out so far there are two of them: 1) Water temp. sender 2) Thermostat (don't know for what use) Would it be possible there is a faulty temperature-related sensor? Any help will be greatly appreciated and sorry for the lengthly post.

03-07-04, 07:25 AM	#5 (permalink)
Cole Austin VIP alllll the way Join Date: Aug 2003 Location: Roanoke, Virginia. Attend School @ VCU in Richmond Posts: 4,587 Car 1: 92 L Rosewood Brown Sedan iTrader: (0)	Its no problem, to get ya started on the right foot. Here is a picture of the air bleed valve. __________________ http://www.directimagehost.com/is.ph...ial-mod-si.jpg Throttle Body Coolant Bypass General F.A.Q. 2nd Generation F.A.Q. People I trust to buy items from: bboarder711 \| legendarysleeper \| Chauffeur First \| SmartJay28

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03-07-04, 06:21 AM	#2 (permalink)
Agent Smith Registered User Join Date: Jun 2003 Location: Ann Arbor, MI Posts: 262 Car 1: 94 LS Dark Grey sedan iTrader: (0)	Welcome to the board. Have you tried bleeding the air out of the coolant system? BTW - use the search button - there is a TON of info on overheating problems.

03-07-04, 07:02 AM	#4 (permalink)
Legend91Cp Registered User Join Date: Mar 2004 Location: CA Posts: 4 Car 1: Legend91 Cpe iTrader: (0)	Thank you so much for even a few responses. I will try your suggestions and I am not familiar with my car engine and such but I am willing to DIY before giving it up to a trust worthy mechanic.

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