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yes,the output speed sensor tells the transmission when to shift. it cost me $25.00 at the dealership, i changed it myself

the same here it runs fine, so i'll just ignore it. thanks for your reply

ok thanks i will check them

i have a 98 G.C. 5.9, every now and then the V.I.C. tells me i have a bad coolant sensor. i have changed both coolant level sensor and temp. sensor, does anyone have any ideas?

my opinion it's craigslist, it's free and you can post pictures

i had similar problem on 98 gc it was the output speed sensor. it cost about $25.00 at the dealership.

im not sure but jimbob2001 was a big help for me.he mentioned that in one of his replies to me but that wasn't my problem so he didn't go into detail.

Finally figured out what the problem is. A plastic gear in the blend motor actuator is broke, it turns a little but not all the way. if anyone knows a good web site or if anyone has one ( motor) i would really appreciate your help.

i know the blend motor is working.something curious though, when in the defrost mode hot air is coming out the floor vent but cold air out the defrost vent, when you change to any other mode its cold air. funds are tight right now but i will probably end letting dealership diagnose the problem...

i guess i'm just going to put on extra sock's and underwear and tough it out:rolleyes:

coolant temp. is normal,both heater hoses are hot. i don't know if blend doors are actuating, how can you tell? i looked at some post didn't see same problem

love my gc, but right now it has frustrated!

does anyone know an easy way to check blend door or blower motor controler on 98 gc, also every now and then the information center says bad coolant sensor, it doesn't say it all the time. if it is bad could this cause my problem

thanks for the tips, i'll give them a try

i have 98 gc 5.9, recently my heat just quit, it has the automatic temp control, digital display reads hi, fan works on all speeds, you can change to defrost, vent , floor. it just blows cold air, any ideals