Question about 1992 Mercury Grand Marquis

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The heater put out very little heat. also the temperture gauge moves very little. is this a bad thermostat. or could it be a bad heat control value.

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If the Temperature gauge is moving less than before, its your Thermostat. If the Engine Temperature is the same, then your heat control valve is not opening or a duct flap(called a door) is not moving under the dash.

Having a Bad thermostat will affect how controls on the engine work and when they work.

Posted on Oct 08, 2010

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1993 dodge caravan heater problems


There should be a vac controlled valve on the heater hose near the firewall. If that valve fails, or something happens to the vac source, the valve will not open or close. I would check that valve and make sure it is working. Both heater hoses should be hot when the engine is warmed up.

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Just had thermostat changed .......temperture gauge goes all the way up then slowly comes back to normal range..no heat in car


As I have written many times if your car is otherwise running fine, do not replace the thermostat and hope that it somehow fixes your heater core. In your case it actually sounds like you put a bad thermostat in and it is not opening at the correct temperature, but much higher. It could be possible that you put it in upside down and therefore the temperature on the outlet side has to be high enough to open it. On a car that new your core should still be good. I would pay a dealer to take a look at it there could be some common problem with the flap that lets the cool air being stuck in the full open position.

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bad gauge or bad thermostat.

Fans come on because when you disconnect, it goes to default mode of fans on high speed.

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Is the temperture gauge going up, if not it is because the thermostat is stuck open. or your dial is broke on the heat panel.

Oct 22, 2009 | 1999 Ford Escort

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Temperature Gauge Always On Cold


As long as your gauge is still moving up, there's no real problem. You have heat coming from the heater. It's only a problem if it's getting too hot. What's going on is that you don't let the vehicle run long enough, and it's so cold outside that the engine stays cold. It raises in temp when your stopped because there's no airflow through the radiator. The thermostat just heats up the engine block, and won't change the reading on the gauge. When this goes bad your car will overheat in just a few miles.

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Dec 16, 2008 | 1998 Jeep Cherokee

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1998 jeep cherokeesport


Follow these steps:

Check coolant level, then start engine until it is warm and the thermostat opens. You will tell when it does when the needle on your temp gauge goes cold when it reaches around 180-200* and then goes back up. Now turn on your heater full blast and go to the engine compartment. You will see a heater valve located on the passenger side, next to the washer reservoir. It is a black thing with 4 heater hoses connected to it. Feel the hoses. When everything is working correctly it should be like this:

Hose going to waterpump will be hot
Hose going to (I think the thermostat housing) will be hot
2 Hoses going to heater core (mounted behind firewall) will be hot

1. If only 1 heater core hose is hot, heater core is clogged--
UNCLOG: remove 2 hoses going to heater core when engine is cool, hook water hose end to one of the sides and flush out gunk from heater core. Reconnect hose and you should be good.

2. If neither hose core hose is hot, heater control valve is bad or vacuum is bad--
Test Vacuum: remove vacuum line from heater control valve, you should feel the vacuum **** on it when pressed to your cheek and the heater control valve actuator should move when you unhook the vacuum line. If you have a good vacuum, it's probable the valve available at autozone part # 5941 for around $21.

To get heat while you wait to replace part, unhook silver arm on heater control valve that is hooked to the plunger. This will give you heat all of the time, but it is controlled by the bottom hot/cold switch on your heater control unit so you won't get hot in the cab. It will just circulate heat through the core.




Oct 25, 2008 | 1998 Jeep Cherokee

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