Can a loose timing belt cause overheating?
05-21-2012, 09:46 PM
#1
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Location: Madison, AL
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Can a loose timing belt cause overheating?
I have an 83 944. Timing belt was replaced a little over a year ago, she is not a daily driver. I still have the original 3 blade fans and used the checks at clark's garage the make sure they are both working correct. Normally my temp gauge sits around 2nd mark but starting last week it started climbing up to the 3rd mark. There has not been any coolant loss nor any foam at the oil cap. Could it be that the belt is loose and not turning the water pump fast enough or is there something else to check? I plan on getting the belt tensioned anyways, I'm sure it is due.
As always thanks for the opinions and advise.
As always thanks for the opinions and advise.
05-21-2012, 09:52 PM
#2
what kind of temps are you dealing with? on hot days at slower speeds my car will climb to the 3rd line (early gauge) but when the fan comes on it quickly falls to the 2nd mark. the way i interpret clarks garage, that is expected operation.
05-21-2012, 10:41 PM
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Just did a bleed on the coolant. My primary fan does not come on in slow speed, it gets over 2nd mark and both fans come on. I checked the fan speeds following clark's and it came on just fine. So am I reading clark's correct and that it is the fan speed resistor?
05-21-2012, 11:20 PM
#6
the slow speed is with the ignition off. with the ignition on the fans run at full speed.
per clarks garage:
if your fans are running on high when you turn the car off, the primary fan should stay on slow speed till the car cools.
per clarks garage:
Test 1
This test checks the slow speed operation of the primary (driver's side) cooling fan.
1. Disconnect the electrical connector for the thermofan switch (below the upper radiator hose connection to radiator.
2. Jumper the contacts in the electrical connector.
3. The driver's side cooling fan should run in slow speed.
A successful test demonstrates that the power supply to the driver's side fan via the slow speed resistor is good.
Test 2
This test checks the fast speed operation of both fans.
1. With the thermofan switch electrical connector jumpered, turn the ignition on.
2. Both cooling fans should run in fast speed.
A successful test demonstrates that the power supply to both cooling fans is good and that both fans and the cooling fan relay are working properly.
This test checks the slow speed operation of the primary (driver's side) cooling fan.
1. Disconnect the electrical connector for the thermofan switch (below the upper radiator hose connection to radiator.
2. Jumper the contacts in the electrical connector.
3. The driver's side cooling fan should run in slow speed.
A successful test demonstrates that the power supply to the driver's side fan via the slow speed resistor is good.
Test 2
This test checks the fast speed operation of both fans.
1. With the thermofan switch electrical connector jumpered, turn the ignition on.
2. Both cooling fans should run in fast speed.
A successful test demonstrates that the power supply to both cooling fans is good and that both fans and the cooling fan relay are working properly.
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05-22-2012, 12:08 AM
#8
these gauges can lie.
05-22-2012, 12:23 AM
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I second the gauge distrust. Mine did exactly what you are describing suddenly one day and I got worried but just before I was about to pull over I hit the dash a couple times and it went right down to the 2nd mark :-/
