1999 Plymouth Grand Voyager SE



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Thread: 1999 Plymouth Grand Voyager SE

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    1999 Plymouth Grand Voyager SE

    I recently replaced the engine in my van and the heat does not work. Just blows out cold air. The engine temp does not seem to want to work either. I found that I will be repairing the dreaded rotted rear heater hose today. I will be cutting the rotted parts out and replacing with regular heater hose. Seems alot have had to do that. If anyone has any ideas about the heat please reply soon.

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    Quote Originally Posted by joeshannallie View Post
    I recently replaced the engine in my van and the heat does not work. Just blows out cold air. The engine temp does not seem to want to work either. I found that I will be repairing the dreaded rotted rear heater hose today. I will be cutting the rotted parts out and replacing with regular heater hose. Seems alot have had to do that. If anyone has any ideas about the heat please reply soon.
    Typical case of bad or missing thermostat. The thermostat goes in the bolt on fitting for the upper radiator hose and commonly fails so that the engine never warms up and therefore the heat never gets up to temp. A simple test is to block the radiator and see if the engine temp gauge will read higher when driving as the radiator will be much more inefficient blocked off.
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top
    www.facebook.com/people/Andy-Greif/1410438927

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    Thank you

    So a bad thermostat would cause the heat gauge to not work at all? It just stays on C and never try to move any at all. I will replace the thermostat in a day or two. Should have to begin with. It is time to take a break and walk away from it for a few days. Oh and why I am asking, I would like to know if you know where 2 wires go that is right with the main wiring harness connector? I should have took pics so I would have remember where they went. It would put you in the mind of 2 ground wires but I do not know if they are or not. Please reply soon.

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    Pretty good bet andyg was refering to your lack of heat issue when he talked about a bad thermostat. Even if the thermostat was stuck open, as he suspects, the temp gauge would eventually indicate a rise in temp. As you're thinking, a new ECT sensor should fix the gauge issue. What is the location of the harness the two wires are in?
    ******** We took the time to answer your post. Please give us some time and post the fix. You'll help hundreds. ********

    **** Follow all prescribed safety procedures before attempting any repairs. If in doubt, refer to a maintenance manual. ****

    96 Gr Caravan LE 3.8, 206K miles
    07 Fusion / 06 RAV 4 / 06 Accord / 94 Camry

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    The 2 wires are with the main harness connector that connects near the transmission dipstick.

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    Crap, forgot to ask what color are the wires including any stripes.
    ******** We took the time to answer your post. Please give us some time and post the fix. You'll help hundreds. ********

    **** Follow all prescribed safety procedures before attempting any repairs. If in doubt, refer to a maintenance manual. ****

    96 Gr Caravan LE 3.8, 206K miles
    07 Fusion / 06 RAV 4 / 06 Accord / 94 Camry

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    Depending on the outside conditions (cold) and if he is driving the van or just idling it, the bad thermostat could keep the engine cold enough to keep the gauge on C. I think the gauge starts to move when the engine temp is around 100*F.
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top
    www.facebook.com/people/Andy-Greif/1410438927

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    The wires are solid gray. One is a thicker gauge than the other.

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    could it be there is an airlock somewhere in the water ways due to the engine swap?

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    I believe you may be looking at several unrelated problems. I believe you will find a vacuum motor on the hot water hose going to the heater, and unless I am mistaken, which is entirely possible, if that doesn't operate, you don't get hot water down to the heater core. I am assuming the heater worked before. Check to see if the vacuum hose is hooked up, it is a hard plastic line with a rubber nipple on it, as I recall. The see if the vacuum motor holds vacuum (if it worked before it should). The other problem is likely a disconnected or faulty temp sensor. Might have gotten damaged in the excitement of changing the engine. Can you put you hand comfortably on the top heater hose or top of the radiator, about 5 minutes into driving? Careful, but you should know by that if it is getting hot enough to register and if the thermostat is opening well. Hope this helps.
    tcwagner1
    2005 T&C Ltd 3.8 69k
    2000 Caravan 2.4l
    1990 Grand Caravan 3.3 149,000 owned 15yrs 4 trannies
    1990 Dynasty 3.0 120k 1 tranny 4yrs
    1981 Dodge Aries 2.6 only new car I ever bought 225k orig 11yrs
    1966 Dodge Coronet 440 Wagon, way old 1 yr. 135$ (Had to borrow it at the bank!)
    1964 Simca 1000 (bought for $10 rebored) 50k 4yrs
    1965 Ply Valiant V8 85k
    1964 Ply Valiant Wagon slant 6 200k 1 qt/200 miles
    1969 Corvair convertible 4 carb

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