Last post on Dec 09, 2013 at 7:21 AM
You are in the Buick Rendezvous
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Buick Rendezvous, SUV
#2185 of 2541 2003 Buick Rendezvous Cooling Fans
Sep 28, 2009 (6:15 pm)
This seems to be a common topic, so maybe someone can help. Neither cooling fan comes on no matter what temperature (although I have not red zoned it). However, both cooling fans come on (at a reduced speed), only when the a/c is turned on. Both fan motors were replaced, as well as all 3 cooling fan relays. I was told that the PCM needed to be check by the dealer. Any other suggestions would be greatly apprecitated.
#2186 of 2541 Re: Temp gauge and tapping in engine [sal72]
Sep 28, 2009 (6:21 pm)
My 2003 Buick RDV is having the same problem with the fans not running unless the a/c is on (and then they only run at a slow speed). Did you ever figure out what the fix was?
#2187 of 2541 Re: 2003 Buick Rendezvous Cooling Fans [arthurleonard]
Sep 29, 2009 (7:58 am)
I've seen this asked a number of times, and usually (unless it really gets into red zone without fans coming on) it is working as designed. In my Pontiac version it has to get really close to red zone before fans come on, just a bit un-nerving to see the needle that high. Both fans are supposed to come on anytime the A/C is used.
#2188 of 2541 Re: 2003 Buick Rendezvous Cooling Fans [ray80]
Sep 29, 2009 (8:48 am)
Thanks for the help. Since I am still trying to payoff this vehicle, I will probably take a wait and see approach.
#2189 of 2541 Re: 2003 Buick Rendezvous Cooling Fans [arthurleonard]
Sep 29, 2009 (9:11 am)
Here is one more possibility for you guys.
The temperature gauge on your dash is fed from a different Coolant Temperature Sensor than what the computer uses to know when to turn on the fans, how fast to idle the engine, how rich to run the A/F ratio, and many other important decisions it has to make based on how hot the engine is running.
So its very possible that the sensor for the dash gauge has gotten covered in coolant 'sludge', corroded, or electrical problem with it. It may be showing much hotter than your engine is actually running.
You would need a scan tool to see what temperature the computer is seeing. It should be generally around 190-210 (generalizing here). If the computer shows normal temperature, but your gauge is showing hot, that's your culprit.
If you can find a local small-shop mechanic, he'd probably charge you very little to hook up the scan tool for 5 minutes when you have your RDV nice and hot so he can check engine coolant temp.
So - in summary - the needle should not hang out near the red zone, that's not normal. BUT it may be a problem with incorrect reporting of the temperature rather than an engine that is actually running hot.
#2190 of 2541 Re: 2003 Buick Rendezvous Cooling Fans [bxd]
Sep 29, 2009 (10:23 am)
'So - in summary - the needle should not hang out near the red zone, that's not normal'
Well it should not stay near red zone, but it is common for it to go near there when stuck stopped in traffic on a warm day, then go down to normal when moving at a better pace.
#2191 of 2541 Re: Low Tire Warning [dale44139]
Oct 13, 2009 (1:03 pm)
Hi, do you remember how you fixed the low tire pressure problem? I'm having the same problem...
#2192 of 2541 engine light codes
Nov 05, 2009 (6:34 am)
I purchased a 2003 Ren last year and have put a lot of kms on it...had a few major repairs also. Just wondering if anyone out there is familiar with the error pictures that show up in the dash? I don't have an owner's manual to refer to and don't want to take it in if it's not necessary.
#2193 of 2541 Re: engine light codes [dtcan]
Nov 05, 2009 (10:18 am)
Hhmm since your putting on KMs, safe to assume you are in Canada? I believe the pictures (also assuming its a vous that was originaly in Canada) may be different then in the states. If you describe the pics (and color of background) it may help determine what they may be. If I can get a link to work, here is an online version of owners manual (its for 2007, but may not be much different)
#2194 of 2541 Re: Low Tire Warning [dmbdawg41]
Nov 10, 2009 (3:43 pm)
on the dash to the left and down push the drive center button mode the when you get to tire presure click on set , ive notice on mine if it came on often it was there was a problem with traction, iether from low air , or im my case was a bad allingment , go figuer