Question about 2005 Buick Rendezvous

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My 2005 Rendezvous heater is only generating minimal heat

I have replaced the thermostat and a "supposed" hose leak, yet the car is still uncomfortably cold no matter how long we drive it. It never warms up.

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You probably have a stuck cold or warm air flap in the climate control plenum.Since most climate control is now computerized you probably need a service center's help.

Posted on Nov 30, 2008

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Posted on Jan 02, 2017

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2 Answers

I changed thermostat on 2005 buick rendevous ultra 3.6l. still have no heat. whats next?


Was lack of heat in the cabin the only reason you changed the thermostat? Were the radiator hoses hot (or very warm) to the touch before you changed the thermostat? Were the heater hoses hot before you changed the thermostat? Did you get a check engine light and code stating that the engine was not getting (or slow getting) to operating temperature?
Getting heat from your heater depends on a blend door actuator letting air flow through the heater core in the HVAC unit. If your radiator hoses are hot, your heater hoses are hot, and you have no trouble code indicating the engine is not getting to operating temperature, but you are not getting heat inside the car, you need to check your blend door actuator or the control unit for the heater.

Jan 08, 2017 | 2005 Buick Rendezvous AWD

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Step by step on how to replace a dodge stratus 2005 water pump and Thermostat.


Dross, Thermostat and the water pump replacement, check the attached links,instruction and guides, Good luck
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Jul 03, 2016 | Dodge Cars & Trucks

1 Answer

2005 Buick rendezvous heater blowing cold and temperature gauge not working properly?


Faulty coolant temperature sensor and a faulty heater control valve.

Jan 14, 2012 | 2005 Buick Rendezvous

2 Answers

I own a 2004 Buick Rendezvous, its a 3.4 liter engine and it's leaking coolant from an elbow on the engine firewall, on the passenger side. It only happens when the heater or the a/c is on. Would you...


That elbow goes to the heater core. Just go to a auto parts store, and ask them for a new elbow, remove and replace and everything will be just fine. The heater core controls the heat and cooling for the cabin of the vehicle.

Is there any fluid leaking onto the floor of the passenger side of the vehicle?

May 29, 2011 | 2004 Buick Rendezvous

1 Answer

Heater on and working - temperature gauge normal. Heater starts to blow cold and temperature gauge goes to full hot and overheated coolant light comes on. Coolant overflow tank full and upper/lower...


one of two things could be happening... either the radiator is low on coolant or your thermostat is stuck (which if it is stuck you will have to replace) . But first let engine cool down, you need to check coolant level, squeeze one of the radiator hoses even if engine is cooled down to make sure there is little or no pressure in cooling system then remove radiator cap/coolant bottle cap to check level.by the way if it is low you will need to figure out why.. the obvious reason is a leak you may have to go to a shop and have system pressure tested to locate leak to repair.. good luck to ya.. hope this helps

Mar 20, 2011 | 2005 Buick Rendezvous

1 Answer

Thermostat replacement 2002 rendezvous


Thermostat Removal & Installation 3.4L & 3.5L Engine To Remove:
  1. Drain the coolant below the level of the thermostat.
  2. Remove the air cleaner and duct assembly.
  3. Remove the exhaust crossover pipe.
  4. Disconnect the radiator hose from the thermostat housing. gm_mv_ven_tstat.gif

  5. Remove the mounting bolts and remove the thermostat housing.
  6. Remove the housing gasket.
  7. Remove the thermostat.
  8. Clean the mating surfaces.
To Install:
  1. Install the thermostat on the engine. NOTE: Apply RTV sealer to the thermostat housing bolt threads.
  2. Install the thermostat housing and gasket with the mounting bolts. Tighten 18 ft-lb (25 Nm).
  3. Connect the radiator hose to the thermostat housing.
  4. Install the exhaust crossover pipe.
  5. Install the air cleaner and duct assembly.
  6. Fill the cooling system.
  7. Check the cooling system for leaks.
3.6L Engine To Remove:
  1. Remove the air cleaner.
  2. Remove the throttle body.
  3. Remove the heater pipes.
  4. Remove the coolant inlet pipe. Thermostat 3.6L gm-03-36-2447.gif

  5. Remove the thermostat mounting bolts and remove the thermostat.
  6. Clean the thermostat and heater pipe mating surfaces.
To Install:
  1. Place the thermostat in the housing with a new gasket.
  2. Install the thermostat and gasket on the engine with the mounting bolts. Tighten 89 in-lb (10 Nm).
  3. Install the coolant inlet pipe.
  4. Install the heater pipes.
  5. Install the throttle body.
  6. Install the air cleaner.
  7. Fill the cooling system and perform a leak test.
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Dec 19, 2010 | 2002 Buick Rendezvous

3 Answers

My 2005 malibu is taking a long time for me to get heat and it also seems that if I put it on max less heat comes out, could it be the thermostat or the coolant there is plenty of coolant in the reservoire...


follow the upper rad hose back to the motor there you will find the thermostat at the end onf the hose

if you go t the deaLer they will usually show you the location and sell you the gasket and thermostat

Jan 02, 2010 | 2005 Chevrolet Malibu

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

2 Answers

Not enough heat in winter


two things..make sure your cooling system is totally full and bled with the heater on.  Also your thermostat may be stuck open.  A flush before you change the thermostat wouldn't hurt.

Apr 03, 2009 | 1996 Dodge Caravan

1 Answer

2000 Cherokee not warm


Aside from flushing the radiator and heater core andreplacing your hoses, did you happen to replace your thermostat. Sounds to me like that's your problem if everything else seems to be in order. If you change the thermostat and still have no heat, you might check your vacuum lines running to the back of your heater controls inside your dash. That's really the only other thing that I believe could be causing your lack of heat.

Hope this helps! Have a great day and try to stay warm!

Nov 19, 2008 | 2000 Jeep Grand Cherokee

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