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Could be your cooling fan not running. While the car is moving air is being pushed through the radiator, but when the car is still the fan is there to pull air into the radiator, if the fan is not running the car will heat up while sitting but cool back off when you are going down the road.
Well, yes and no. The shroud helps the fan pull more air thru the radiator. So yes the broken shroud could be a factor, but you could also have problems with air flow thru the radiator. Or restrictions inside the radiator for coolant flow.
condensor sit in front of radiator if condensor damaged to badly it will block air flow through cooling fins which will block off air from radiator cooling fins when vechicle moving it will overheat if condensor or radiator damaged.your cooling fan need to be working because it will turn on when engine get to certain temperature if not engine will over heat.
Three quick ideas. Make sure the vehicle sits overnight and check the radiator fluid level in the radiator itself. If it gets low you will get an air pocket causing overheat. Also check the reserve tank to be sure it doesn't have a crack or a hose fallen off which would cause an air pocket in the engine block by emptying fluid instead of recirculating. There should always be fluid in the reserve tank.
Second, radiator cooling fan not coming on. If your air conditioner is not working well at stop lights, then this is usually the culprit, since the fan helps to move air across the air conditioning coils. Everybody replaces relays but generally it is the motor becoming intermittent, since they are open framed and exposed to the elements.
Third is the thermostat may be stuck in the closed position, which will cause overheat. Hope this helps.
check cooling fans, they should be on. sideways engines need lots of air flow forced over the radiator since ther is no mechanical fan moving the air, the engine overheats while sitting still if electric fans are not working.
Sounds like coolant isn't circulating. While moving engine making pump circulate coolant and fresh air hitting front of radiator. At idle or a stop, engine not making pump run as fast and there is no fresh air hiiting radiator ( especially if fan isn't working properly) Check out water pump and cooling fan.
It sounds like it may be your electric cooling fan. When the car is sitting idling does the fan behind the radiator ever come on? If not then this is your problem. Your car doesn't overheat when it moving because you're passing air through the radiator with the movement of the car. The problem could be the fan itself, the fan relay, or a temperature sensor.
Have someone flush cooling system & check condition of rad for debris in front of rad & blow or spray it out as necessary. Next time it runs hot, turn your heater temperature up high, blower fan on high, and see if gauge starts to come back down a little. If it does, my guess is your rad needs replacing, or at least consider trying a good reverse flushing of the system first, then rad.
The radiator cooling fan relay has most likely failed. It is underneath the air cleaner on the frame rail just behind the radiator. NO cooling fan = overheating. This is the first thing i would look at. Best way to tell is when the van gets hot see if the cooling fan is on. You will hear it running if it is coming on. It will set a code for the cooling fan relay also.