Troubleshooting an overheating engine....HOW????
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From: Ft. Lauderdale, FL, USA
Troubleshooting an overheating engine....HOW???? I just picked up my car today and drove it home. The engine is friggin awesome, just like last time, THANKS Agostino Racing Engines for the rebuild.
But its getting hot fast while driving in the city, When I had the engine for its first year I could drive around in 95 degree Florida heat with the A/C on max and it would never get to the 210 mark. Today it went right to the 210 mark and it was going to pass it without the air on and driving like a granny. I had to put the heat on high to get it back down.
On the hwy it went down to about 195 without the A/C on, usually it would sit right over the 180 tick mark. Usually with the A/C on on the HWY it would maybe move to 190-195.
Basically now, it will go right past the 210 mark if I don't put the heat on full blast. I don't think I ever heard the fan come on and I have a squeaking noise coming from the front of the engine like a belt or bearing.
Any thought? Thanks.
But its getting hot fast while driving in the city, When I had the engine for its first year I could drive around in 95 degree Florida heat with the A/C on max and it would never get to the 210 mark. Today it went right to the 210 mark and it was going to pass it without the air on and driving like a granny. I had to put the heat on high to get it back down.
On the hwy it went down to about 195 without the A/C on, usually it would sit right over the 180 tick mark. Usually with the A/C on on the HWY it would maybe move to 190-195.
Basically now, it will go right past the 210 mark if I don't put the heat on full blast. I don't think I ever heard the fan come on and I have a squeaking noise coming from the front of the engine like a belt or bearing.
Any thought? Thanks.
Do you hear the squeaking for a couple of seconds after the car is shutdown?
If so it's the bearings in the fan motor. They are inexpensive and aren'y that hard to swap out.
Good luck. Glad to see ARE got you straight.
If so it's the bearings in the fan motor. They are inexpensive and aren'y that hard to swap out.
Good luck. Glad to see ARE got you straight.
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From: Ft. Lauderdale, FL, USA
Originally Posted by Richie Carbone
Do you hear the squeaking for a couple of seconds after the car is shutdown?
If so it's the bearings in the fan motor. They are inexpensive and aren'y that hard to swap out.
Good luck. Glad to see ARE got you straight.
If so it's the bearings in the fan motor. They are inexpensive and aren'y that hard to swap out.
Good luck. Glad to see ARE got you straight.
How does a bad bearing hurt the spinning? Is it just not spinning as fast as it should?
Question:
Can I just lift the car and do it myself with regular tools? Do I just drop the fans and tear them apart and the bearings will just come out easily?
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From: Ft. Lauderdale, FL, USA
Originally Posted by Richie Carbone
If it's not the fans there could also be air in the cooling system. Easy to fix.
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Originally Posted by Richie Carbone
Good luck. Glad to see ARE got you straight.
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Originally Posted by Quickin
Damn, one more question: Where do I get the bearings?
Thanks.
Thanks.
You can't replace the bearings, you would have to replace both fan motors, you just have to remove the shroud that the fans are attached to and swap them. Last time I checked they cost $60~$70 each.
As for removing any air from the system, let the car run with the radiator cap off for a few minutes and see if the level goes down when it's up to operating temp, if it goes down alot add some more coolant/distilled water mix 50/50 and top it off and replace the cap. That will ensure that all of the air is removed form the system.
It's more than likely the fan or fans are done.. especially on a 98 with some age and milage.
Good luck.
Post up the #'s when it's tuned.
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From: Ft. Lauderdale, FL, USA
Originally Posted by Richie Carbone
If the bearings are squeaking it means the fan motor is shot and is not spinning fast enough to keep things cool.
You can't replace the bearings, you would have to replace both fan motors, you just have to remove the shroud that the fans are attached to and swap them. Last time I checked they cost $60~$70 each.
As for removing any air from the system, let the car run with the radiator cap off for a few minutes and see if the level goes down when it's up to operating temp, if it goes down alot add some more coolant/distilled water mix 50/50 and top it off and replace the cap. That will ensure that all of the air is removed form the system.
It's more than likely the fan or fans are done.. especially on a 98 with some age and milage.
Good luck.
Post up the #'s when it's tuned.
You can't replace the bearings, you would have to replace both fan motors, you just have to remove the shroud that the fans are attached to and swap them. Last time I checked they cost $60~$70 each.
As for removing any air from the system, let the car run with the radiator cap off for a few minutes and see if the level goes down when it's up to operating temp, if it goes down alot add some more coolant/distilled water mix 50/50 and top it off and replace the cap. That will ensure that all of the air is removed form the system.
It's more than likely the fan or fans are done.. especially on a 98 with some age and milage.
Good luck.
Post up the #'s when it's tuned.
Thanks a helluvallot man, I'll get some new ones tomorrow if my dealership is open.
Or is there a cheaper place?
If you can get the part #'s you can order them from www.GMparts.com it might take 1-2 weeks to get them but they will be half the price that a dealer will charge you.
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From: Ft. Lauderdale, FL, USA
Originally Posted by Richie Carbone
If you can get the part #'s you can order them from www.GMparts.com it might take 1-2 weeks to get them but they will be half the price that a dealer will charge you.
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From: Ft. Lauderdale, FL, USA
Originally Posted by Richie Carbone
If you can get the part #'s you can order them from www.GMparts.com it might take 1-2 weeks to get them but they will be half the price that a dealer will charge you.
My fans are spinning when the temp gauge in the cluster gets to about 160, but I can't hear them spinning. I just reached in and felt them spinning. I thought when they kicked on in the past they were pretty loud and easily heard from standing near the car. Is this what failed bearings causes?
My coolant started to flow and the level only dropped like 1 inch and continued to flow.
Is there another web address, that one isn't working.
Thanks.
Last edited by Quickin; Jul 24, 2004 at 02:57 PM.
Originally Posted by Quickin
Richie,
My fans are spinning when the temp gauge in the cluster gets to about 160, but I can't hear them spinning. I just reached in and felt them spinning. I thought when they kicked on in the past they were pretty loud and easily heard from standing near the car. Is this what failed bearings causes?
My coolant started to flow and the level only dropped like 1 inch and continued to flow.
Is there another web address, that one isn't working.
Thanks.
My fans are spinning when the temp gauge in the cluster gets to about 160, but I can't hear them spinning. I just reached in and felt them spinning. I thought when they kicked on in the past they were pretty loud and easily heard from standing near the car. Is this what failed bearings causes?
My coolant started to flow and the level only dropped like 1 inch and continued to flow.
Is there another web address, that one isn't working.
Thanks.
OOOPS! Sorry about the web address, it's www.GMpartsdirect.com
It was a little late lastnight when I posted that.
The fans might be spinning, but they might not be spinning fast enough to keep the engine cool. If one or both are squeaking it means the fan or fans are on the way out.
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From: Ft. Lauderdale, FL, USA
Originally Posted by Richie Carbone
\
OOOPS! Sorry about the web address, it's www.GMpartsdirect.com
It was a little late lastnight when I posted that.
The fans might be spinning, but they might not be spinning fast enough to keep the engine cool. If one or both are squeaking it means the fan or fans are on the way out.
OOOPS! Sorry about the web address, it's www.GMpartsdirect.com
It was a little late lastnight when I posted that.
The fans might be spinning, but they might not be spinning fast enough to keep the engine cool. If one or both are squeaking it means the fan or fans are on the way out.
Thanks.
Did the new engine come with new PCM, or the old
PCM reprogrammed? The stock low-speed fan and
high-speed fan settings would be about 210F and
224F (?).
Low speed fans might not be "hearable" against a
healthy motor, barely against stock. High speed
you should be able to notice. Might check that all
ducting is properly tight; the little draw-through
electric fans depend on that backside radiator
ducting to get the air to run through, rather than
around.
With a hotter motor (more cubes and probably
higher CR into the same water jacket) you may
want to go find yourself a higher-capacity radiator
anyway.
PCM reprogrammed? The stock low-speed fan and
high-speed fan settings would be about 210F and
224F (?).
Low speed fans might not be "hearable" against a
healthy motor, barely against stock. High speed
you should be able to notice. Might check that all
ducting is properly tight; the little draw-through
electric fans depend on that backside radiator
ducting to get the air to run through, rather than
around.
With a hotter motor (more cubes and probably
higher CR into the same water jacket) you may
want to go find yourself a higher-capacity radiator
anyway.
Well, you might want to check to see if:
-fans are coming on
-Verify what size thermostat is in there
-Check your tuning, has that been changed?
-Top up coolant cold in the radiator, if it's low it can run hotter, top it up to the top and let it run a bit and if it drops a bit top it a bit more
You have a very expensive engine I would be very careful and diligent on this issue.
-fans are coming on
-Verify what size thermostat is in there
-Check your tuning, has that been changed?
-Top up coolant cold in the radiator, if it's low it can run hotter, top it up to the top and let it run a bit and if it drops a bit top it a bit more
You have a very expensive engine I would be very careful and diligent on this issue.
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From: Ft. Lauderdale, FL, USA
Originally Posted by Pro Stock John
Well, you might want to check to see if:
-fans are coming on
-Verify what size thermostat is in there
-Check your tuning, has that been changed?
-Top up coolant cold in the radiator, if it's low it can run hotter, top it up to the top and let it run a bit and if it drops a bit top it a bit more
You have a very expensive engine I would be very careful and diligent on this issue.
-fans are coming on
-Verify what size thermostat is in there
-Check your tuning, has that been changed?
-Top up coolant cold in the radiator, if it's low it can run hotter, top it up to the top and let it run a bit and if it drops a bit top it a bit more
You have a very expensive engine I would be very careful and diligent on this issue.
-160 thermostat
-Tuning wasn't touched
-I let it run yesterday until it started to flow and the level moved maybe an inch down while it was flowing.
My friend is gonna check my fans tomorrow.
I assume that fans are really meant for city driving, stop and go when there's no real airflow from the air dam to help cool the water. On the HWY I run fine. As soon as I slow down it gets hot.
Originally Posted by Quickin
-Fans are both coming on, but seem slow and you can't hear them spinning.
-160 thermostat
-Tuning wasn't touched
-I let it run yesterday until it started to flow and the level moved maybe an inch down while it was flowing.
My friend is gonna check my fans tomorrow.
I assume that fans are really meant for city driving, stop and go when there's no real airflow from the air dam to help cool the water. On the HWY I run fine. As soon as I slow down it gets hot.
-160 thermostat
-Tuning wasn't touched
-I let it run yesterday until it started to flow and the level moved maybe an inch down while it was flowing.
My friend is gonna check my fans tomorrow.
I assume that fans are really meant for city driving, stop and go when there's no real airflow from the air dam to help cool the water. On the HWY I run fine. As soon as I slow down it gets hot.