I got no heat if I go faster then 40 MPH, and if is super cold outside.
I'm having porblems with my heater, it does heat up when it warm outside or if I Idle the car for long time (10-20)min. Then when I start moving the temop guage goes to the cold and never goes up again.
it a 97 sebring convertible JXI
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What is happening here is that the faster the heater blows air through the fan, the more it cools the liquid in the heater core, and so heat output is reduced. The root of the problem is either the engine is not warming up enough, or the heater core, and/or heater core lines, are plugged up, not allowing the water to circulate properly in the heater core. Here is what I would try.
1. Top off the radiator and overflow.
2. Is the engine warming up properly? Is your temperature gauge showing normal temperatures? If it is not, then replace the thermostat.
3. If steps 1 and 2 do not solve the problem, get the vehicle in a shop, locate the heater core lines, take them apart and flush out the heater core. Look for blockages in the fittings. Do a flow test on the core. It may be clogged and need to be replaced.
The dash gauges are notoriously inaccurate. But it is possible that the thermostat is stuck open. Does the upper radiator hose get hot after engine warmed up? Also feel both heater hoses-when engine is warm, both should be hot-indicating the coolant is circulating through the heater core. If heater hoses are hot, and you still have cold air, the temperature blend door on the heater case may not be operating.
Try a new thermostat and see if engine warms up faster and better.
start engine let run 5 minutes in park open hood find heater hoses at fire wall passenger side are both warm/hot if no, thermostate, if yes check heater controll valve or clogged heater core,if cable operated,opening and closing,if vacuum operated.is it getting vacuum when going to hot to cold?outside cold air duct working?there is allso a controll box behind radio on firewall
the themostat has to open so you have to warm the car up first so thats normal but if you mean that the heaters dosnt work even when the trucks warmed up untill 40 mph than it may be an open outside vent accuator may be bad..and it dosent close till speed build up presser against it
it takes quite a while for a diesel to warm up by just idling in order to produce any heat.you have to put them under a load (drive it), before you will get any noticeable heat.if you have a block heater, plug it in 4-5 hours before you plan on driving it and that will definitely help produce interior heat quicker.