Question about 1989 Plymouth Reliant

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My reliant K is is constantly over-heating even after 10 minutes of running time. Is that a thermostat problem?

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Reliants run very hot normally, but you are definitely having a cooling problem. More than likely your thermostat is stuck in the open position. The reliant comes with a 220 degree thermostat, and what that means is that it doesn't kick in until 220 degrees before your fan goes on to cool down the radiator. It is much better to switch to a 180 degree thermostat, which will kick in sooner to cool everything down. Your Reliant also came with a single core radiator, which is also part of the cooling problem on these cars. It is a far better idea to switch to a dual core radiator. Between the 180 thermostat and the dual core radiator, your cooling problems will be a thing of the past.



Posted on Jun 13, 2009

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It could be a stuck thermostat, a bad radiator, a bad water pump, the timing belt worn out retarding the timing back, or even a leaking head gasket.

Posted on May 25, 2009


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1 Answer

Should my thermostat be removed?

No It is there for a purpose and the problem that makes you consider the removal of the thermostat should be fixed . It is there to bring the coolant to correct operating temperature as quickly as possible and then to regulate the flow through the radiator to maintain a constant temperature. The easiest check for a thermostat problem is to start the engine cold and let idle for around 10 minutes Place your hand on the top radiator hose and if the thermostat is ok you will feel the hot water start to flow through the hose. If you have the radiator cap off you will feel the water heat up and you may see the water start to flow as well.. Over heating problems can come from blocked or partially blocked radiator cores, leaking head gaskets or cracked head, thermostat, old soft hoses, timing , air/fuel mixture, blocked exhaust, overload /over speed , wrong gear resulting in excessive rpm's, coolant fan not working, viscous fan hub not driving fan, loose fan belt, blocked fins of the radiator( plastic-grass-mud)

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Hi guys I am new on this, I will start all over, I got this big problem for me, I got this 2002 huyndai elantra gt, 1 week ago I was driving and the heat stopped working, no radiator leak, everything...

Ok, here is my take on your problem. As you may already know, it takes a car a few min. to actually warm up to operating temp. When the coolent reaches operating temp. the thermostat opens to circulate the coolent in the radiator. Now, as your drive, the air pushing against your car will actually blow some air through your heating system ducts and into the passenger compartment. Is it possible that your blower fan isn't working? Because while you are stopped, there would be no air forcing its way through your ducts, thus no heat. As your drive, your car gets up to operating temp, heats up, and the air pressure as your drive will blow some heat out into the passenger compartment? On a side note, if your thermostat is stuck in the open position, it would take it forever to warm up since it is circulating ALL the coolent even tho it isn't at operating temp. A thermostat stuck open will take 30 min or more before you actually feel any warmth, if at all in the winter.. your thermostat opens and closes constantly as the engine is running to keep it at its normal temp, usually around 160-180 degrees. If you live where it gets really cold, a thermostat stuck open likely will never get warm. If your blower motor works, and your engine don't overheat, im 98% sure its your thermostat.

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First solution--check to make sure radiator is full of antifreeze. If not, top up to 1 inch below the top--then run engine 10 minutes--should be heating if antifreeze level was down a quart or more. Second solution--drive car 5 minutes--find open highway--dry road--floor the gas--if engine thermostat is sticking --this MAY blow it open. If there is now heat--the problem is a sticking thermostat. Thirdly, if no solution-- there is a possible plugged heater core--take to technician for testing. (This is under dashboard & extreme work needed to remove.)

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With these types of issues it is always best to start by flushing out the cooling system and replacing the thermostat. If you get no heat out the vents, that points towards a clogged heater core which usually will need to be replaced.

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Correct timing for a 1983 plymouth reliant

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2 Answers

1998 Mazda 323 Protege - constantly overheating, even after fairly short runs (10 minutes). Coolant overflow bottle turns from green to dark grey each trip and almost "explodes".

Possible cause ;
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3. Bad head gasket.
4. Low coolant level.
Try to replace thermostat first , this way you illuminate thermostat and coolant level , you'll have to ad coolant after replacement and purge system.

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1 Answer

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