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Old 03-07-2013, 12:19 PM   #1
1989 Plymouth Voyager 2.5 turbo No Heat  
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I have a 1989 Voyager 2.5 Turbo, and for the last few months the van on some days has heat and other doesn't. I can be driving and have heat and the all of a sudden it goes lukewarm and cold.

I have flushed the core forward and back flush changed the water pump and the rad cap was bad and changed that as well. I removed the switch near the heater hoses on the firewall thinking the switch wasn't working, thats switch is for the a/c. I even checked for air pockets. I hoisted the front end of the van up about 3 to 4 feet removed the rad cap and got air pockets out. And when the air goes lukewarm I've checked the blend door in the cab by moving it back and forth and it works. Goes from cold to back to heat which is lukewarm. Now when I lose heat when I touch the gas I get my heat back and its not like I have to hammer the gas just raise the rpm like 100 to 200 rpm and I have heat. The system doesn't seem to be leaking I have checked a few times and each time the system is full. P.S this problem is very intermittent. I could have heat today and then no heat tomorrow.

Any help would be appreciated thanks
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Old 03-07-2013, 12:27 PM   #2
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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vacuum leak to the control panel inside the car maybe? What about the heater valve in the engine compartment? Holding vacuum well?
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Old 03-07-2013, 12:32 PM   #3
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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vacuum leak to the control panel inside the car maybe? What about the heater valve in the engine compartment? Holding vacuum well?
I the valve is the one your talking about near the firewall and switchs from a/c to heat thats been removed and bypssed.
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Old 03-07-2013, 03:01 PM   #4
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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I the valve is the one your talking about near the firewall and switchs from a/c to heat thats been removed and bypssed.
The water valve in the engine compartment that directs coolant to or away from the heater core.
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Old 03-07-2013, 07:53 PM   #5
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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Usually low heat that increases in temp as rpm is increased is caused by a low coolant level and the heater core will be the first thing affected.

Use the Chrysler recommended procedure for filling/bleeding the cooling system.




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Old 03-09-2013, 11:56 AM   #6
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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That valuve has been removed to exclude that as a problem. Thanks
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Old 03-09-2013, 11:57 AM   #7
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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The water valve in the engine compartment that directs coolant to or away from the heater core.
That valuve has been removed to exclude that as a problem. Thanks
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Old 03-09-2013, 12:05 PM   #8
Re: 1989 Plymouth Voyager 2.5 turbo No Heat  
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Usually low heat that increases in temp as rpm is increased is caused by a low coolant level and the heater core will be the first thing affected.

Use the Chrysler recommended procedure for filling/bleeding the cooling system.




Checked again today Over flow bottle nice and full and rad is full as well. So there are no leaks in the system. Since Friday when I had the last problem there is heat very weird. What happened Friday was, I started driving the fan heat started to build nicely. Then I pulled over to the side of the road to use my cell phone. With the van still running in park after a few mins the heat when totally away cold air only. Swithced the blend door back and forth and when I went back to heat it would go just above cold for a second and then back to cold. I drove home and later that day used the van again this time I had heat really really weird. Looked like I may have had an air lock right at the heater core??!!

Thanks

Any other advice Pls
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