yardbuzzard

they will fit a 89-94 LS400 without any problems.

will NOT fit 95+

thanks

When I stop my 95 LS400 at a light the air temperature from the heater begins to fall and becomes completely cold. At cruising speed the heat is fine. Coolant level is full and air has been bled. Help it's cold in there!

Flush the heater core extremely well if bleeding the system does not work.

Totally lost to what could be wrong. As of today (Dec 23, 2008); my heater worked fine. Now, there's no heat or air blowing thru the vents. If it a 'Blower Motor', please guide me to locate this thing. Thanx, and Happy Hoildays everyone...............

something that quick, I would check the fuses.

does anyone know if wheels for a GS 300 or 400 98-2000 fit a 94 LS 400?

thanks in advance.

I went through everything like you did. Turned out it was a nearly clogged heater core. A determined mechanic spent 3 hours with solvents and air until it was clean. He said it was amazing at the amount of junk that came out of it. cost me a bunch but now it heats as new. And by the way, change your cabin filter if you have not done that in a while. Really helps the fan blow some serious air.

We've got a 94 LS400 which the heater stopped blowing any hot air. First thought, thermostat. I've changed it twice---no change. Next, heater valve, or heater core. NOPE clean as a whistle through and through. Tried the valve manually in case it was broke, nothing again. Flushed and filled. Changed all the hoses. Nothing. Relays, fuses, OK, OK, OK. NO CODES SHOWING. Vent motor is working. I have had almost everything out and checked. ZIPPO. I'll take any ideas before I'm completely gray headed. Thanks!

My 94 LS 400 has a need for a replacement by pass pipe due to corrosion. It is the pipe that attaches to the upper radiator hose that actually goes to the thermostat housing and both heads. Anyone got a spare motor that might have one of these?

thanks in advance

Bill in NC

Heater door control? How do you test this or get to it? My car is cool at idle but warm at higher rpm/s. Replaced tstat, rad. cap, burped system. No better. It is intermittant.

thanks

if ur heater isnt blowing hot, its your heater door control, if your valve is leaking its losing coolant is all, but, if u lose so much coolant your heater will not blow hot due to no coolant, at that point you should notice your gauge fluctuating

Ok good, temp up to normal, stat is good (at least I hope your engine temp sensor is not lying to us...but probably not).

Next step, check the heater hoses again and try to see if they are hot, cold or lukewarm. Try to check right at the firewall (I am hoping there isnt

some kind of bypass valve inside the cabin itself). If the hoses are hot, then coolant is making it into the cabin and hopefully the heater core.

Check the hoses and let us know. I realize that you dont have a calibrated hand but you should be able to sense somewhat the temp. And be careful not

to get into any moving parts. (I know this is somewhat tedious. However, I am trying to get this narrowed and avoid the "shotgun" approach).

I've finally got back to the car. I've checked the hoses repeatedly, and they both are extremely hot. I changed the cabin temp sensor, and still no heat. Lets see, I've replaced the thermostat twice, cleaned the heater valve twice, replaced all hoses (plus blew everything out), flushed the system and refilled twice (because I'm clumsy), burped the system I don't know how many times, removed, checked, and replaced all fuses and relays. changed the cabin temp sensor, checked for error codes, and still no heat. I've got the dash in shambles just checking wiring, from what I CAN see, everything on the controls seem to be working ok. SOOOOOOOOOOO I guess I'm going to have to send it in to have it diagnosed. It's snowing here today so driving with NO heat was a bit contrary to good sense. Maybe one day, the problem will be solved. Thanks again for ALL suggestions. Keep'em coming because I've got to wait until I've got the money to send it in, and with it being Christmas, that may be a while. Again, I really do appreciate any and all ideas. THANK YOU!

put the temp on max, warm the car up, fan on max.

Mine does the same thing. I have gone through the same diagnostics, new thermostat, cap, flush, burp, disconnected battery, Mine will get warm at higher revolutions but blows cold on idle. Sometimes it will quit heating at running speed. Sounds like climate control somewhere but I have yet to hear if anyone has fixed this problem with replacement of climate control...anyone out there? Thanks in advance. Closest dealership is 2 hours away and then how long to leave it, etc. Any help appreciated

bring the RPM up to about 4000-4500 and hold it there.

hot air?

if so, you either have a bubble in the system, a leak somewhere (i had one that was TINY), a dead thermostat, or all of the above.