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Low heat on buick rendezvious

Have had 6 thermostat changes and coolant measures at 145 degrees in winter. Poorly heats cabin.

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Ask to see a water pump for your car at an autoparts store like Autozone or Advance. This may be a model with a relief valve inside the waterpump. If your car is one of the rare ones with this part, it may be stuck open on your car.

Also have someone check the Electric Radiator cooling fan Relay. Sometimes it can stick to run full on when it should be off. This would be a simple fix. There are also sensors which activate the Electric Radiator cooling fan Relay. If the sensor is telling the engine to cool itself too early, then the fan would activate too soon.

You can get FREE diagrams at and see which Relay is in the powerbox and which is by the electric Radiator fan. Then you could simply replace the relay. But the sensor, if bad, would still tell the Relay the wrong information. It would need to be replaced, perhaps instead of the Relay.

If the car seems to be have some drivibility issues in cold weather, then the temperature sensor may be failing to tell the engine that it is cold and not hot. The sensor can be stuck on the hot settings, making the electric Radiator fan work and failing to control the engine for cold conditions.

Posted on Feb 20, 2012


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Posted on Jan 02, 2017

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SOURCE: oil in coolant reservois

The details you have supplied point to possible head gasket failure, however if as you say 2 Winters and No problems if it were me I would leave well alone as if you flush the system it might make matters worse and overheating could occur.
Failing that can you temporarily by pass the heater matrix/core if it runs fine and stays cool then a flush possibly will return warmth to the interior.
Keep an eye on coolant as although you reckon No oil in radiator it is coming from somewhere and settling in the heater.
Finally this sounds saft but do you let your local service station check/top up your fluids? If so then possibly someone not too clever has popped oil in your coolant by mistake?
Good Luck!
Paul 'W'

Posted on Jan 07, 2009

  • 77 Answers

SOURCE: 1998 Dodge Durango no heat when using heater.


Posted on Jan 08, 2009

  • 4669 Answers

SOURCE: Low Coolant light flashing on 1996 Buick Regal 3.8

The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.

Posted on Mar 01, 2009

  • 6674 Answers

SOURCE: sonata coolant temp at 61C at thermostat opening

If your positive that the reading is from coolant after the thermostat opens & on the return side of thermostat, as in flowing toward or into radiator, then that is too low. 61C/142F is too cool, even in summer. It should be coming out around 82C-90C.(180F-195F) I'd double check that reading and make sure it's coming from the discharge side of thermostat, and if it's correct, replace it with an 82C/180F thermostat, as this is what is recommended for 2.4L engine, but call Hyundai on the 3.3.L engine, as I am not getting a listing for thermostat on 3.3.L. Also keep in mind that during winter, your AC compressor is kicking in anytime your on defrost, as well as your normally running with heater on as well, if not defrost, which all contributes to lower gas mileage, add more fuel to get engine started when cold, and it will suffer some, but if running too cold, certainly will throw that all off as well.

Posted on Aug 11, 2009

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