Express2500 4.8L takes over 15 minutes to get up to temperature
#1
Express2500 4.8L takes over 15 minutes to get up to temperature
Hi I have a express van that will take forever to get up to operating temperature. I suspect the fan to be over cooling maybe the termostat is stuck a bit open but it’s brand new so maybe it’s faulty. Can anyone point me on how to text the fan for proper operation if that’s not it I will change the thermostat
#2
Can you spin the fan by hand with the engine off?
Likely a bad thermostat.
Likely a bad thermostat.
#3
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#7
OP, how many minutes for the the engine coolant gauge to be showing the coolant is hot ? it's supposed to get to lukewarm in 2 mins. but my 3500 doesn't blow hot air into dash vents w it lukewarm. on my 07 3500 express it takes me a good 8 minutes to get hot air coming out of my front dash vents w the heat dial cranked to max. I don't get any dash heat if the little gauge is showing cold coolant.
is there a way to check if yr engine coolant sensor sending unit is working properly ?
out of curiosity can you put an OBDII on it at cold startup and read freeze Frame data when the status changes to open loop ? (I don't know if that change of loop status correlates to when you should be getting hot air from the fan out of the dash vents. anyone else know this ? )
is there a way to check if yr engine coolant sensor sending unit is working properly ?
out of curiosity can you put an OBDII on it at cold startup and read freeze Frame data when the status changes to open loop ? (I don't know if that change of loop status correlates to when you should be getting hot air from the fan out of the dash vents. anyone else know this ? )
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#8
A scanner with live data should be able to show you what the CTS is reading, I was able to do it on my 2002. The CTS in that instance had failed and indicated -68' F on a warm day.
Closed/open loop should be irrelevant, either the stat is closed long enough for it to get to temperature or not.
Mine has rear heat but I don't recall issues with getting heat from it. Might check if there's any valve that opens to let coolant flow though the core, that that is working correctly.
Closed/open loop should be irrelevant, either the stat is closed long enough for it to get to temperature or not.
Mine has rear heat but I don't recall issues with getting heat from it. Might check if there's any valve that opens to let coolant flow though the core, that that is working correctly.
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MitchM (February 24th, 2022)
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