1998 4.6liter temp gauge issue
06-13-2011, 10:50 AM
#11
since you said the heater blows cold. take the hoses off of the heater core. take a hose with a handle on it and spray water into the inlet on the heater core to check for blockage and to clean it out. if water hardly comes out then i would suggest replacing the heater core if blasting it with a hose doesnt help the water flow.
if the heater core isnt the issue i would replace the water pump. it seems like its not building up enough pressure or pushing water through the heater core..
if the heater core isnt the issue i would replace the water pump. it seems like its not building up enough pressure or pushing water through the heater core..
12-14-2011, 07:12 PM
#12
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I have a new to me 1998 Expy XLT 4x4 with 4.6 liter. My temp gauge alway goes right to high when started and doesn't move until key is turned off. I get no codes, current or history. I changed the grey sensor and no change, this always fixed the problem in my 91 explorer. If I disconnect the sensor the gauge behaves the same. The heater always blows cold. The coolant reservoir has fluid and the level changes. Cap hisses when opened. Any suggestions? I'd really like to fix this. I take it off road and don't want to burn the beast down. Also gets colder than a witches @*^ during the winter so heat would be nice. 