shirkes330

So had my timing belt an water belt replaced this past week and it's running great!!! Except this morning when I went out it was kinda chilly so I turned on my heat and it just blew out cold air:/ AC works fine just no heat??? Any idea what it might be?

deanshark

You have air in the system. You need to bleed it out. Get it to normal temp, turn the heat up to max, and open the bleeder a little to let the air bubble out. The bleeder is the 17MM bolt on top of the thermostat housing. Make sure the coolant is full.

shirkes330

Would it make my temp gauge jump then go back down to normal temp really quickly?

91LS400vgb

yes, it could do that. How is the coolant level in the plastic reservoir?

shirkes330

Almost completely empty... I'm not sure why my mechanic didn't fill it back but It kind of makes me upset that he didnt

91LS400vgb

Let's hope that there was just air in the system. Make sure you fill it back up with 50/50 of the same exact coolant that you have in there - it should be at the lower line when cold. Then keep an eye on it for a few days.

deanshark

Yes the gauge will go all the way to hot and come down when there's air. If you had a mechanic do the job then you should bring it back to him. But, first thing to do is put some coolant in yourself b/c he might not have even put any back in when he drained it if the resevoir is empty. You don't want to cause any damage.

mikes7ke

iTrader: (1)

When I did my water pump change I noticed I had to fill the coolant in real slow. At a point I was just letting water trickle in. Turned it on, turned the heater to high heat full blast and held 2500 rpm for ten minutes. I let it sit overnight, did the same procedure the next day, and it was good to go.

It seems to me your mechanic failed to follow the correct procedure to refill the coolant.

shirkes330

My family and I have gone to this mechanic for over 30 years so I'm not sure why he didn't refill it back but I was able to get some coolant before any damage was caused. Thank god for the forum helping me out!!! You guys are great!!!