How does the van run? It could be the headgasket, if you smell a sweet smell from the exhaust then its the headgasket. If not check the Oil, if theres like, water and stuff in the oil then it could be the headgasket still. The thermostat wont make it lose cool unless theres leakage around the thermostat housing gasket.
had the same problem with a sibring,took to the garage,they replaced the thermostat and gasket and found a hairline crack in the thermostat housing they replaced the housing and everything was fine then
If your radiator isnt leaking and car is having a over heating problem and coolant spewing out. Chances are your thermostat needs replaced. possible the radiator needs to be flushed. But more likley its thermostat
A faulty thermostat in a 2001 BMW 325CI can cause a coolant leak. The coolant may be leaking out a crack in the thermostat or through a warped edge. In some cases the problem may be just a bad gasket and not actually a problem with the thermostat at all.
Could be low on coolant. If the coolant continues to "disappear", you may have a head gasket problem.
It could possibly be a clogged heater core
im having the same problem with my 1994 I've replaced the heater core,thermostat,radiator,i checked the coolant, and it's not over heating or nothing and still no heat lol
possible head gasket problem this engine was famous for it.
What other symptoms besides leaking antifreeze? Where do you see the anti-freeze leaking?
Check your cooling fans in front of the radiator. It could be a relay or fuse to your high speed fan motor. Also, check your coolant temp sensor, antifreeze level, and or thermostat again.
Ok, if you follow the main coolant hose from the radiator to the engine block you will see that before the coolant actually enters the engine block it goes through a plastic housing with two electrical plugs this is where the thermostat is located. One of the two plugs controls the thermostat (if not both). I had a problem with my cooling system ('94 VW Jetta GL III 2.0L) as well and had to find it on my own. I replaced the whole housing for approximately $35 and it fixed my problem.
BDTC P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature " I have seen this several times this week alone. All three times I replaced the coolant temp sensor and it fixed the customers problem. john f.
Could be low on coolant or a faulty thermostat.