Question about 1990 Buick Regal

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1999 buick regal water temperature gauge reads high when car sits and idles for a while then goes back down when i drive off and transmission acts like it doesnt want to shift when car is hot but shifts fine after temp. gets below 1/2 way..

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  • JB711 Feb 21, 2012

    Ive changed thermostat and flushed radiator and car is full of coolant but temp. still climbs slow when car sits and idles for a while..

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One of two things the transmission fluid pump needs replaced or the transmission filter is clogged replace it if the pump is bad a tranamission rebuild will need to be done also make sure your coolant is not low on antifreeze

Posted on Feb 21, 2012

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Posted on Jan 02, 2017

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honeymokey
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SOURCE: 2003 BUICK REGAL TRANSMISSION PROBLEM.

This is a common problem on some GM cars. There is a pressure control valve in the side cover of the transmission that needs to be replaced. The transmission does not have to be rebuilt. You will need to get a side cover gasket also.

Posted on Apr 28, 2009

soc21610k
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SOURCE: 2004 Buick Regal. Hard tranny shifts.

Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems

Posted on Jun 02, 2009

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SOURCE: Buick sounds like a dying chicken

Do you have the 3800 V6? It sounds like a bad bearing. Most likely the tensioner pulley or alternator.

Posted on Jun 16, 2009

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SOURCE: outside temperature gauge for my malfunctions

The problem is a bad ambient air temp sensor or a broken wire to that sensor. The sensor usually is located in the front of the engine bay on the support for hood latch, between the outer grill and the radiator/condensor assemblies.

Posted on Jul 22, 2009

michaelcanto
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SOURCE: 93 buick regal will not unlock when shifted into park

Your vehicle is designed to auto lock the doors when you reach about 15 mph. This is a one way deal. When you park the car, unlocking the doors becomes a manual process to insure the occupants safety at their destination.

Posted on Jul 26, 2009

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1 Answer

What causes my temperature gauge go from high to low


IF your symptoms are when driving , the temp gauge acts normal rising slowly. Then all of the sudden it goes high and a second or two later it goes back to normal. Then you have low coolant in the engine. The reason this happens is because of air pockets. Air pockets are much hotter than the coolant. Check for coolant leaks...

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Check the transmission fluid level. Also check the rear differential if your car has one ( I think the 99's were still rear wheel drive) for fluid. If either of these are low, the fact that things are fine indicates that the low fluid level is causing problems. Also, the trans fluid should be a nice pink color. If it isn't then the transmission is not in good shape and should be looked at again by the rebuilder. If the fluid levels are fine, have the rebuilder check the trans again to see if he missed something.

The issue with the temp gauge is entirely separate except if you mean that the car begins to heat up when the shifting problems are occurring. If the temp gauge goes way up then comes down quickly regardless of how the car is being driven, the thermostat may be sticking and should be replaced. If the car is hard to drive and then starts overheating, the transmission may well be defective and causing the engine to work harder than it should.

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When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.

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