View Single Post
Old 11-09-2017, 08:13 PM   #6
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 39,188
 

2003 L-Series 3.0L Sedan
Default Re: 02 sl1 heat isn't working

You may be describing two issues; lack of heat and an errant coolant indicator. If the engine isn't overheating, the coolant indicator may be telling you coolant level is low. Even when coolant level is correct, old cooling systems create slime and other undesirables. I not flushed out and replacing antifreeze, sludge may collect on the float, dropping it lower by weight and triggering the coolant light. A quick test of this is to overfill the container above the fill line by about an inch and see if the light turns off. If it does, the coolant container can be cleaned with hot water and dishwashing powder to remove sludge on the float. Or just overfill and leave it at that. The lack of heat may be related to one of several things; blocked heater core, heater hoses, outlet tube or worn out t-stat. If periodic coolant flushing and replacement isn't done, do so and disconnect the heater hoses to force water into the heater core to flush out any blockage, reversing flow to ensure flow.

REWARD EXCELLENCE!

Add to fdryer's Reputation
Rate the quality of this post and help fdryer reputation points. Click the reputation button near the bottom left corner of this message box. Thank you!
fdryer is offline   Reply With Quote