93 Lesabre Heater fan - AC Auto Repair Help Forum


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93 Lesabre Heater fan

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Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum

Kiddmoney
New User

Dec 17, 2007, 6:10 PM

Post #1 of 4 (2017 views)

93 Lesabre Heater fan	Sign In

I have a 93 Buick Lesabre and having problems with the heater fan turning on. The car features both auto fan and manual fan. Since the weather has been cold, the fan will not turn on (in manual or auto mode) until the car has been driving for 15-20 minutes. The time it takes to for the fan turn on varies on how cold the car is. If the car has been in the garage, the fan will turn on within 5 minutes. If it has been sitting outside, the fan will take longer to turn on. I have just replaced the thermostat thinking this was the problem, but I am having the same issue. Any thoughts on how to fix?

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 18, 2007, 2:27 AM

Post #2 of 4 (2013 views)

Re: 93 Lesabre Heater fan	Sign In

This is probably normal and you need to select defog/defrost setting until the car warms up. Bet that will overide the delay as the system is waiting for more temp to allow for fan for just heat only but should work on other settings before it's warm. ATC systems do that and it's annoying to me anyway,

T

Kiddmoney
New User

Dec 19, 2007, 4:18 PM

Post #3 of 4 (2006 views)

Re: 93 Lesabre Heater fan	Sign In

I have tried using all the different modes including the defrost and still have this problem. This is my main concern because I can not defrost the windshield when it is cold outside.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 19, 2007, 10:54 PM

Post #4 of 4 (2004 views)

Re: 93 Lesabre Heater fan	Sign In

Ok: I'm not so familiar with how GM does it but the fan in auto mode will try not to freeze you or make you too hot in systems with ATC. Usually the defrost setting just lets it go but this one may not. In many they are sensing the available temp in the inlet heater hose and wait till it gets up to perhaps 120 degrees F before if will engage fan but will run anyway in defrost.

If you find the inlet hose and a block with just two wires that would likely be the sensor. AYOR, that if jumped might defeat the delay idea but the rest should work. Again - that's At Your Own Risk - it works in older Fords but can't say for GM.

If you can see the body of the blower motor perhaps just giving it a good tap will get it to go and that would indicate the motor itself is a bit sticky and should then be replaced. That's common but not always so consistant as you indicated. Motors that respond the the tap trick have problems with the brushes making contact,

T

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