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Buick Rendezvous Overheating

pertusetpertuset Posts: 3
My wife has told me that the heat gauge is going way up and last night it went clear to the red line. I check all of the fuses, they were good, and then I looked at the relays for the cooling fan and could not tell if they were burnt or not.
The cooling fan comes on and runs for about 10 seconds and shuts off..... Is this how it is supposed to run, or should I replace the 3 relays that I cannot check....
Thanks for any help possible.


  • ray80ray80 Posts: 1,655
    Does it only heat way up while idling in traffic on a hot day? If so I would not be suprised if it got real close to redline before fans kicked in. Have you been adding coolant at all lately and did it get pretty low at any point? Does it stay high for quite a while or does it get high and go right back done again?
  • She also said the she can never recall that the fan have kicked on in a while. I took the relays out, put them back in and the fan kicked on, and then back off after about 10 to 12 seconds....
    We recently had the cooling system flushed, because it had gunk inside of the radiator, maybe they may have not put enough coolant back in it. Because when I was checking the realays I also, put some dex-cool in the overflow tank.
    If I am having to add it, what could be the problem.....I dont see any leaking on the ground, or do I see any of it in the oil.
    I hope there is nothing seriously wrong with her car.....She loves it.....
  • ray80ray80 Posts: 1,655
    Hhmm being a 2002 I would have to wonder about lower intake manifold gaskets (very common problem). If the radiator was gunked up, it may well have been because of air in system (due to low coolant level) plus if you still are adding some, quite likely you may have the gasket troubles (coolant leaks around gasket but evaporates so you don't see puddles). If it is the gasket you may be able to see it by looking at engine from drivers side front corner. Look past a fat radiator hose and the black metal thing they use to tilt engine, you should see a thin black line (or sometimes blue) plastic going from upper left to lower right. If you see the line but it is a fat looking oily mark, it is most likely the gasket leak (dealor has a test to confirm).
  • I have a 2002 CX (86,000 mi) that has a temp gauge that has gone out of control. On an 11 mile trip it went from C to H with the overheat light going off, back toward C and back again 4 times within the trip. No radiator / coolant leaks, but I know it's not good for the engine. I figured bad thermostat, and had that replaced. It didn't fix the problem. Will the thermostat take a little time to "seat" or something? Also, no heat coming into the car when this stuff happens. Just great for the upcoming Cleveland winter. Have any of you had this happen, and what did you do to fix it?

  • ray80ray80 Posts: 1,655
    From what you discribe it sounds like air in the system and it needs to be purged via bleed screws. The thermostat should not take any time to work properly.
  • I have a 2002 Rendevous CX and I had a new transmittion put in in June 2006, when I collected the vehicle and paid the $2600 bill I noticed that the service light was on....after more 3 visits to the dealership I was told it was the interior lights don't work or flash on and off, and periodically all the dashboard lights and indicators fail.....also my heater/blower only works now on high....are these things anyone else has had issues with? and are they things I can fix myself?
    I would appreciate any feedback....
  • can you please tell the outcome to your problem, i am going through the same thing right now.
  • Well, we took it to a shop and had it flushed and filled with new anti freeze, and a new thermostat. Something else we had done was when we had it flushed and refilled, we did not use the Dex-Cool anti-freeze. We had if refilled with regular anti-freeze. The Dex-Cool has some faults to it. It will eat the seals out of the engine and then you will see leaks.
    I hope this helps out in any way.
  • nidgenidge Posts: 18
    Sounds like an air problem to me to. Have recently changed your air filter by chance? If the air mass system isn't set up and everything all lined up perfectly, the car does have a tendency to run warmer. At least that is what took my a long time to find out. From the day that I replaced the stock air filter with a new K&N air filter, I had problems until I took the time to really be careful putting everything back together. By the way, the K&N filter will give you a lot more boost to.
  • OK- I now have the same problem- What was your fix?
  • OK- I now have the same problem- What was your fix?
  • My 2005 just blew a head gasket @ 58,000 miles. I don't tow or any other unusual conditions. Isn't a $2,000 engine repair unusual for this mileage? Does GM ever pay for unusual repairs out of warranty?
  • i have an 2002 and i struggled with various problems until it was very obvious that i had 2 blown head gaskets. this is a very sensitve motor or a poor design....look for another motor, it'll be cheaper.
  • What would cause a 2005 buick rendezvous to over heat, not go over 10 to 40 mph and shake
  • gmcustsvcgmcustsvc Posts: 4,252
    Hello Handymantom,
    I am from GM Customer Service. I apologize that you are experiencing a concern on your vehicle. Can you please email me more information about your situation, so I can look into it further? You can get my email by clicking on my name. Thank you,
    Mariah GM Customer Service
  • jpiercejpierce Posts: 49
    When things happen on this vehicle they happen in clusters, some related some not. I have had everything go wrong on this vehicle and have experienced everything. 25 plus things repaired (head gaskets to transmission, AC condensor, rad...and the list goes on and on and all this with 5 years on the vehicle. New GM warranty would of covered everything). Anyway two things with the situation you discribe. The dash light business could be related to a common problem with the RDV. There is wiring on the driver side under the carpet (right by the rear of the front seat). The wires here for some reason corrode and fuse together causing a short or you could have multiple things coming on at once (this corosion could be due to Sun Roof leakage which mine did if seal not cleaned regularly). If your car does not have sun roof it could be a body control module for a particular curcuit or function (then you need the dealer to figure it out).

    It wires fuse in the location I indicated it can cause the problems mentioned. Short curcuit with lights not working or working intermittance and other wired things. I needed the wiring redone in this area. A bit of slicing and dicing and sodering.
  • buddo9buddo9 Posts: 18
    edited June 2010
    In the 2002 and later Buick CXL Rendezvous..
    The overheating problem will never go away!
    I realized there was a problem when I raised the hood and tremendous gust of heat hit my face!
    The engine is in a restricted compartment area under the hood with very little exit to remove heat buildup!
    The heat just keeps building up! So badly, it blisters the paint at the only escape rout that it has near the rear center of the hood ,
    With an inspection, you can see the rubber guard on the hood seals off the windshield and the heat crawls to the two ends of that rubber seal then back to the highest point at the center of the hood..
    The compartment is not big enough to keep the engine from it’s own heat!
    The cause is a bad design of the engine vent system!
    I cut away the top half of the rubber seal at center (2 foot wide x 1”) That way there is still enough left for water run off from windshield area .. Be careful not to cut away in front of air screened vents … My CXL is now a cool tool...
    Bud Crawford Coopersburg PA 18036
  • spike99spike99 Posts: 239
    Love your idea of customizing the base design and allowing it to breath (vent) better. Keeping things cooler is a great idea. However, not too sure if I would modify its factory rain gutters. Especially if one lives in "April Showers" or colder snow climate region - like my region.

    Instead of cutting away rain gutter material, I wonder if installeing a rear facing hood vent would be much better? Simply cut a hole in the rear / center of the hood and instead of mounting a forward facing hood vent, simply install its opening in a rear facing position. This way, air flow is sucked into the front hood and pushed out the top of the hood. Especially while driving down the road. And, its factory rain gutters remain untouched - "as factory design".

    For a few pictures of low profile "bolt on" hood vents, surf: -> install with its opening facing the windshield. -STI/image_01_600.jpg -> install with opening rear facing.
    etc. etc.

    Overall, I do love your idea of "keep it cool". Keeping the inner engine compartment cool (especially during hot summer months) is a great idea...

  • renman1renman1 Posts: 1
    Well this problem started about two monthes ago. Never a dull moment with this vehicle, its one thing right after another so fast I can't fix them all. I just have to prioratize and fix what will keep this car moving! Safe or un-safe. Can't afford to fix the anti-lock wheel sensor. Just put a transmission in it four monthes ago. Well back to the problem at hand, the water pump was leaking a little water so we replaced the water pump and of coarse the belt. That stopped the leak and all seamed fine for six weeks. Then it started this over heating problem where the gauge would peg out on hot and I would get a flashing red light warning but when I would open the hood the engine didn't seem that hot! It felt more like normal, so I changed the sending unit thinking the temp guage was wrong (not). So next it was the T-stat (o-m-g what a p-i-t-a!). Someone said it had an air bubble in the cooling system so I spent hours trying to purge air out of the cooling system. So next it was the radiator cap, this thing just continues to over heat or so the gauge says. A couple of times it did over heat for sure, it actually felt hot. How can you tell if the head gasket is blown? It seems to run ok, other than a very slight miss at idle. Can anyone shed some light on this?
  • spike99spike99 Posts: 239
    edited August 2010
    To me, it sounds like an intake or head gasket leaking problem. Instead of letting rad fluid out, its "sucking air" in. Thus, creating air bubbles inside the RAD. Thus, one gets the impression their cooling system "always" has air locks trapped inside its system.

    If wondering, I had a previous 2.0L 4 cyinder engine and its heat temp dial would go nuts as well. Its dial would move up and down - as if the grand stand folks were doing a "giant wave" - back and forth - at a major sports event. The night before, I drove the vehicle to my mechanic and the next morning, he calmly removed its "cool temp" RAD cap. He let the 2.0L engine idle for 15-20 minutes (with gas cap off), then we both looked down "inside" the rad's top opening hole. We could see bubbles floating up - up from its rad fluid. Talk about weird!!! He explained that its head gasket is gone and its sucking air into the engine, then pushing air into the rad's cooling system. Yet, no rad fluid under the vehicle when sitting. If wondering, 3 days later, my wife & I traded that vehicle in. Based on its older age, it wasn't worth a $2,000 head job (with its heads plained down for better contact) repair.

    Hope this helps...

  • I have a 2003 rondezvous, and wife has stated that the over-heat lite comes on and off, and the heating goes cold. have also had air bag lite come on,and tire preassure lite as well. Took to dealer,and they could find no problem on the computer. took to a electrical place, and he said he could find no problem as well. This is a totally "come and go" problem. Can anyone offer any advice? If there is a wiring problem, shouldn't buick call a recall on these vehicles?. dealer wanted nearly 3k to replace wiring harnesses,what a rip-off. :cry:
  • ray80ray80 Posts: 1,655
    If the heater blows warm then cold without any changes to controls I might suspect a low coolant situation, shouldn't be any electrical issue with that. The air bag light may be connection issue (perhaps under the seat) or that and the other light could be an issue with BCM.
  • I have a 2005 Buick Rendezvous with the "34" engine. Recently it has developed a problem where the car says it is overheating, the dial runs all the way to "H" the red light comes on, chimes sound and all that. There are no leaks anywhere, and when I pop the hood the coolant reseviour is full and it bubbles. It is NOT bubbling because it is hot. If I pop the cap on the tank and wait about 2 - 3 minutes the coolant finds its way back into the system and off I go. It used to happen just once in a while, but now with the colder weather it happens quite frequently. I will be driving along with hot air in the car, then it suddenly turns cold, the guage will move to "H" Sometimes it will also just go back on its own and hot air will flow again in the car. I replaced the radiator cap so far and that has not helped much. Any thoughts anyone? I want to drive the car again, but am a bit concerned. Again, there are NO leaks in the system anywhere that I can see. Thanks!
  • ray80ray80 Posts: 1,655
    Kind of sounds like low coolant or air in system. If coolant was added at some point it 'could' have been low enough to allow air in and system would need to be bled again
  • I am looking at a 1999 Camry for my son and I suspect there is a short when ignition is in the off position (or key is removed). When we went to see the car the battery was nearly dead. Owner said it had been started about a week earlier. It was a new battery, owner said her mechanic said it was a faulty battery, he replaced in on warranty.

    I am skeptical that that was the issue.

    Can I check for a short with a multimeter (e.g., remove ground cable and check with an amp meter) or a code reader?

  • Navigating this forum is as clear as ...... facebook.

    I am trying to post a question in the Electical forum, how the heck does one do that?

    I've only been using computers every day for work for 24 years so I need some help.

  • steverstever Posts: 52,462
    Try here:

    Toyota Camry Fuse and Electrical Questions

    Go to the last page of the discussion and you'll find a posting box.
  • Have you figured out anything with your car. I have a 2005 rendezvous also and I am having the very same problems. I had taken my car down to the shop and they told me that my exhaust is getting into my coolant and causing my thermostat to shut down and then my car overheats. The thermostat shutting down explains the cold air that starts blowing out of the vents because its not allowing the hot coolant to filter through the car. I was told that I need to have my engine removed and new gaskets put on my car and then they have to have my heads checked for cracks and stuff. I was quoted a starting price of $1500 but they wont know more until they start the work! If you have any other information that might help me could you please email me at [email protected] you and good luck with your car
  • spike99spike99 Posts: 239
    When vehicle's temp goes into sudden cycles of extreme hot to extreme cold (even while sitting at a stop light), it's either a sticking thermostat or blown gaskets. If "no air" within the system, then it's a stuck thermostat. If "air" in the cooling system, then it's blown engine gaskets.

    If wondering, one of my previous vehicle's had blown engine gaskets. It took $2,000 to repair / replace its gaskets as well. Thus, their price range of $1500 + taxes is reasonable cost of repair. If getting gaskets replaced, ensure they "plane the flat surfaces" as well. Thus, getting a much better seal. And, to remove any warps - that might have been created from over heating...

    Good luck....

  • gmcustsvcgmcustsvc Posts: 4,252
    Can you please email me your VIN, current mileage, and involved dealer? I would like to look into this further for you.
    GM Customer Service
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