Question about 1988 Plymouth Grand Voyager

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Already changed the thermostat changed the vacuum value still no heat why

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  • Plymouth Master
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Hi Brenda,could be your blend door is not opening when you turn to hot or the heater core is bad,check floor board on driver and passenger side for wetness.Does the blower motor blow air thru the vents.

Posted on Nov 18, 2014

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Posted on Jan 02, 2017

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1 Answer

My thermostat is blowing cold. I need help


Your thermostat is a part in the engine cooling system. I suppose you mean that when you operate your heater you get cold air only. This could mean the engine is not heating up (so change the thermostat) or that the air blend door is not functioning (so vacuum leak or bad check valve in the vacuum control circuit or bad blend door actuator).

Apr 02, 2016 | Cars & Trucks

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How to change temperature sender on AUDI 1.9 TDI


The specific location of the sender is on back of cylinder-head near by vacuum-fuel double pump. There is an assurance clip and a rubber sealing O-ring. Heed of antifreeze solution temperature!!!
Before you try to change the sender you must be sure that the sender is out of order. First you must check the thermostat operating. Thermostat checking:
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.
5. If the thermostat and the temp sender are OK the last piece out of order will be the instrument cluster.

on Dec 19, 2009 | Audi A4 Cars & Trucks

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Overheating and heater blows cold air i changed the thermostat..


probably you changed thermostat with different temperature value... so change it to thermostat with same value like the old one

Feb 25, 2016 | 2001 Isuzu Rodeo

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My 1996 volvo 960 is over heating after i replaced the thermostat. What else could be causing this


check which way you put the thermostat in. The body of the thermostat has to face the water (in head or block) for the heated water to make it work. In the wrong way and it blocks off the water flow and the care will over heat.

Dec 31, 2013 | Cars & Trucks

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No heat already changed the thermostat


Check vacuum hoses. There's one between engine and firewall at the passanger side that operates ur heater. This little creature dries up due heat expossure and cracks causing a vacuum leak that will trigger ur check engine light as well..

Jan 17, 2013 | Ford Cars & Trucks

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Car over heats when warm and pushes water and coolant into over flow tank already changed thermostat


well if you have already changed thermostat there is a few other things that can cause this they are listed below
1. faulty rad cap
2. coroded water pump impeller / replace pump
3. rad fan not coming on / possible faulty coolant temp sensor will cause this

May 05, 2011 | Ford Thunderbird Cars & Trucks

1 Answer

I have a 2000 ford expedition and the heater blows air just not hot air or even warm air.. weve already changed out the thermostat, heater core, heater control valve and it still isnt working.. what could...


Check the vacuum hoses from the switch to the engine compartment. If you manually operate the heater valve on the firewall (follow the 5/8" hose) you will get heat.

Feb 08, 2011 | 2000 Ford Expedition

3 Answers

No heat changed thermostat


Are you saying the engine does not get hot or that your heaters are not working..?
If it's the heaters, change the temp control on the dash to full heat, then trace the heater hoses under the hood from the firewall back to the motor. Hopefully this will locate the heater tap. Now if the tap is vacuum operated, start the motor and check if there is vacuum at the small hose connected to the tap. No vacuum is correct. Now change the heater control to cold and there should now be vacuum at that small hose. if vacuum is still not present, or if you have vacuum but it does not go away no matter where the heater control is placed, suspect the control in the dash.. If the vacuum operation is correct, suspect a blocked or damaged heater valve and replace it..

Nov 05, 2009 | 2002 Mercury Mountaineer

1 Answer

Water temparature gauge


The specific location of the sender is on back of cylinder-head near by vacuum-fuel double pump. There is an assurance clip and a rubber sealing O-ring. Heed of antifreeze solution temperature!!!
Before you try to change the sender you must be sure that the sender is out of order. First you must check the thermostat operating. The thermostat location is on back of alternator at the bottom side of the bracket. IMPORTANT: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking:
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.
5. If the thermostat and the temp sender are OK the last piece out of order will be the instrument cluster.



Oct 10, 2008 | 2000 Audi A4

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