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High Engine Temps!
Thread Starter
Racer
Joined: Dec 2005
Posts: 431
Likes: 0
From: North Las Vegas Nevada
High Engine Temps!
Today when doing some city driving, I noticed my eng temp getting up to 230. That did'bt bother me, but it seemed like the fans were'nt kicking in to bring the temp down like they normally do. When I got to the gym, I popped the hood and the fans WERE running but the temp was still hanging at about 226 to 230. Do the fans run and then kick up to a faster speed when the negine temp needs to be lowered? Cause if so, I think mine may not be doing just that. Are there some relays I should check for this type of problem?
Thanks so much!
Rob
Thanks so much!
Rob
Drifting
Joined: May 2000
Posts: 1,917
Likes: 3
From: Southern NH
This is normal especially for the outside temps you are seeing in that part of the country.
The fans come on in 2 stages. The low speed fans come on at 219*F, and the high speed fan kicks in at 228*F. Here are the details.
Cooling fans come on based on the following inputs:
Low Speed Fan comes on when:
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 150 psi. The minimum on time is 50 seconds.
High speed Fan comes on when:
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 180 psi. The minimum on time is 26 seconds.
Your engine temps at 230*F are still well within the normal range, but if the temps increased up to 240 then you should consider there's a problem. Also, check under the nose in front of the radiator to make sure there's nothing that got sucked in and restricting the airflow.
The fans come on in 2 stages. The low speed fans come on at 219*F, and the high speed fan kicks in at 228*F. Here are the details.
Cooling fans come on based on the following inputs:
- A/C system
- ECT Sensor
- Vehicle Speed Sensor
Low Speed Fan comes on when:
- ECT is above 219*F, the fans come on.
- AC head pressure is above 219 psi.
- Engine spoeed is above 3500 RPM for 12 seconds and the oil tep is above 261*F.
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 150 psi. The minimum on time is 50 seconds.
High speed Fan comes on when:
- ECT is above 228*F, the fans come on.
- AC head pressure is above 225 psi.
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 180 psi. The minimum on time is 26 seconds.
Your engine temps at 230*F are still well within the normal range, but if the temps increased up to 240 then you should consider there's a problem. Also, check under the nose in front of the radiator to make sure there's nothing that got sucked in and restricting the airflow.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Get on the ground and look up into your radiator AC condensor. I bet there is all kinds of crap, grass and micky d bags up there. Pull all that chit out then take a high pressure air hose and blow the sand and dirt out.
Thread Starter
Racer
Joined: Dec 2005
Posts: 431
Likes: 0
From: North Las Vegas Nevada
Originally Posted by AU N EGL
Get on the ground and look up into your radiator AC condensor. I bet there is all kinds of crap, grass and micky d bags up there. Pull all that chit out then take a high pressure air hose and blow the sand and dirt out.
Thanks!
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Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
I've been getting some fairly high readings with the recent temperatures allmee. Have to say my fans have been working overtime though. It's a lot better when you climb the hill up into Summerlin
Race Director
Joined: Nov 2003
Posts: 12,346
Likes: 5
From: Mustang OK
Originally Posted by JC in XTC5
This is normal especially for the outside temps you are seeing in that part of the country.
The fans come on in 2 stages. The low speed fans come on at 219*F, and the high speed fan kicks in at 228*F. Here are the details.
Cooling fans come on based on the following inputs:
Low Speed Fan comes on when:
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 150 psi. The minimum on time is 50 seconds.
High speed Fan comes on when:
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 180 psi. The minimum on time is 26 seconds.
Your engine temps at 230*F are still well within the normal range, but if the temps increased up to 240 then you should consider there's a problem. Also, check under the nose in front of the radiator to make sure there's nothing that got sucked in and restricting the airflow.
The fans come on in 2 stages. The low speed fans come on at 219*F, and the high speed fan kicks in at 228*F. Here are the details.
Cooling fans come on based on the following inputs:
- A/C system
- ECT Sensor
- Vehicle Speed Sensor
Low Speed Fan comes on when:
- ECT is above 219*F, the fans come on.
- AC head pressure is above 219 psi.
- Engine spoeed is above 3500 RPM for 12 seconds and the oil tep is above 261*F.
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 150 psi. The minimum on time is 50 seconds.
High speed Fan comes on when:
- ECT is above 228*F, the fans come on.
- AC head pressure is above 225 psi.
Once the fans are on, they will turn off when the ECT temp drops ~11*F, or if the AC head pressure drops to 180 psi. The minimum on time is 26 seconds.
Your engine temps at 230*F are still well within the normal range, but if the temps increased up to 240 then you should consider there's a problem. Also, check under the nose in front of the radiator to make sure there's nothing that got sucked in and restricting the airflow.
For model years 2001 through 2004, the following is covered in the GM Service Manual in the Engine section, under Cooling System Description and Operation and all the details can be found therein:
Both fans operate together at the same time at either the low or high speed. The engine cooling fan system consists of the two electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the Powertrain Control Module (PCM) to operate both fans together at the low or high speed.
The low speed is commanded on when the coolant temperature reaches 226 degrees F. It is turned off when the coolant temperature lowers to 219 degrees F. The High speed is commanded on when the coolant temperature reaches 235 degrees F. It is turned off if the coolant temperature lowers to 226 degrees F. When the A/C is on and the coolant temperature reaches 185 degrees F, the low speed will be turned on when vehicle speeds are less than 35 mph.
HTH
Last edited by GrayC5; Jul 27, 2006 at 04:15 PM.
Thread Starter
Racer
Joined: Dec 2005
Posts: 431
Likes: 0
From: North Las Vegas Nevada
Once again.....Thanks for all the input! Vegas is hell is the summer & I hate having to use the AC so much. But sometimes you gotta leave it off and GET SOME!!! Happy pedal I mean! 
Rob
Rob
Melting Slicks
Joined: Jan 2004
Posts: 3,138
Likes: 37
From: Burbank. CA.
Originally Posted by AU N EGL
Get on the ground and look up into your radiator AC condensor. I bet there is all kinds of crap, grass and micky d bags up there. Pull all that chit out then take a high pressure air hose and blow the sand and dirt out.
Steve
Thread Starter
Racer
Joined: Dec 2005
Posts: 431
Likes: 0
From: North Las Vegas Nevada
Originally Posted by mountainbiker2
Make sure you do this. My wife's Corvette had all kinds of stuff stuck in it. You have to look between the two radiators. Her front one was clean looking from the front view.
Steve
Steve