Radiator Fans

redrum3g · #1 02-24-2008, 02:53 PM

Yes, I really need help. My radiator fans is not coming on. When i drive it for a long time the coolant in the tank bubbles up and the fan will not come unless i hook a piece of wire directly to the positive. How Can i Fix this?

maxwedge · #2 02-24-2008, 04:23 PM

Welcome to AF, post the year please.

redrum3g · #3 02-24-2008, 04:31 PM

I have a 95 Buick Lesabre.

Loekee75 · #4 02-25-2008, 05:32 AM

Check your cooling fan relay(s) you can simply switch them out with another relay that you know is working properly, just to see if that is the problem.

redrum3g · #5 02-25-2008, 06:52 AM

no the relays is in good condition. Where is it for i can make sure i checked the right one.

HotZ28 · #6 02-25-2008, 02:12 PM

The location of the fan relays are shown below. What is your coolant temp showing? The PCM uses the information provided by the coolant sensor to command fan(s) on. Will one fan run if you turn on the A/C?

redrum3g · #7 02-25-2008, 02:36 PM

where do i see the coolant temp? None of the fans come on when i turn on the ac.

HotZ28 · #8 02-25-2008, 03:08 PM

If you do not have a temp gauge in the IC, you will need to check the voltage or resistance of the sensor to determine the output. (See below). The sensor is located under the TB in the end of manifold. It would be easier to use a scanner to read the engine temp.

redrum3g · #9 02-27-2008, 06:38 AM

okay i switched the relays and now the fans come on when i turn on the ac but now the car wont start I just got a brand new battery but when i boost it off and take the cables off the lights will begin to blink from dim to high then cut off

HotZ28 · #10 02-27-2008, 08:00 PM

Quote:

Originally Posted by redrum3g

okay I just got a brand new battery but when i boost it off and take the cables off the lights will begin to blink from dim to high then cut off

You need to check those battery terminals for corrosion under the rubber insulation. Why would you have to “boost it off” with a new battery? What lights “begin to blink from dim to high”? What cuts off, the lights?

redrum3g · #11 02-28-2008, 09:28 AM

Ok, i changed out my battery out my car to my girlfriend car and it cranks right up. Just to let ya'll know me and my girlfriend have the same exact car. So i took my battery to get tested and charged when i go back to get going to let them test the alternator.

redrum3g · #12 03-22-2008, 07:35 AM

Ok, I really need to know whatz not making my fans not coming on. even when i turn on the ac it will not come on either.

HotZ28 · #13 03-22-2008, 08:35 AM

Quote:

Originally Posted by redrum3g

Ok, I really need to know whatz not making my fans not coming on. even when i turn on the ac it will not come on either.

Your thread above was merged with you previous thread with the same subject. Posting multiple threads on the same subject is a violation of our community guidelines which you agreed to read when you opened an account @ AF. In case you missed that section, here it is again:
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redrum3g · #14 03-23-2008, 07:50 AM

sorry about that, but i really need to know what causing my fans not to work. but it works when i turn on the ac, but soon as i turn on the ac the service engine light come on saying qdm 1 & 2 failure.

HotZ28 · #15 03-23-2008, 09:55 AM

Have you checked to see what the coolant temp sensor is sending to the PCM with a scanner? The first fan (low speed) should only come on @ 212 deg (or when A/C is requested) and the second fan (high speed) should come on @ 220 deg. If working properly, the PCM should command a ground circuit (quad driver) to the fan relays @ the temperatures listed above. If you have a quad driver fault, I would suspect the PCM has gone defunct, or an associated wiring problem.

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