Climate control problems? Read This!

[chitownvic]

Issue with with My defrost.. My Defrost doesn't work, When I switch it to defrost it just keeps blowing out of the vents.. Thanks mangs..BTW Thanks for the thread gadget I can finally fix my "Floor" too

[chitownvic]

BTW before anybody links me to this thread I posted this cus I read the whole thread and couldnt find anything on just Defrost fuck ups..

[gadget73]

does it shift to floor when you set it there? if the air doesn't really shift at all and sort of comes out of everyplace all the time, most likely its a problem with the air doors in the plenum. When my car did this, both doors in the plenum had broken at the hinges, causing the doors to just flop around in there uselessly.

[chitownvic]

It shifts to floor when I put it there but nothing comes out..(Kinda just shuts off) But thats the least of my worries I kinda need my Defrost Haha.. When I put it on defrost and put it on high it blows hardbut it trickels out of the defrost vent an the most of it is coming out of the regular dash vents

[91waggin]

How do you know it's shifting to floor if you don't get anything? I think your first step is to fix the business with the defrost, because the diverter door hinges are probably FUBAR. Once you fix the hinges in those doors, you may get a better idea about what's going on.

[chitownvic]

Allrite will do.. Now, how do I get there?? Haha

[gadget73]

Bypass the TBL. Jump the two electrical wires together and the floor position ought to work. If you want to elimiate it entirely, unplug the vacuum lines and seal them up too. A squeeze of RTV to block them up should do the job nicely. Just let it cure before you start the motor.

[Andypot1985]

So where is this thermal blower lockout switch. I don't have the floor so i would like to replace it.

Thanks

[87gtVIC]

under the hood near the map sensor. Looks like a coolant flush tee bit with some vacuum lines and electrical hookups. Just trace back the heater hoses out of the firewall and you should find it.

[Andypot1985]

thank you! ill go look for it today

[game over]

i have a problem with my heater - when the car stands with the engine running - the heater works fine, but when i driving at 40 mph or faster it becames coldy. any thoughts?

[sly]

the check valve under the hood just about dead center on the firewall that has one line going to the soup can and the other going through the firewall. That's probably in need of replacing. The vent system is loosing vacuum and it defaults to cold in the older cars. It should have one hose coming from the vacuum tree (plastic tube with a lot of lines coming from it) and two lines coming out the other end. Also, check the "soup can" on the driver side to see if it holds vacuum. If it has holes in it, it will cause the same issue. Also check for broken vacuum lines in all of this.

[gadget73]

Going cold isn't a vacuum leak. Sounds like you may need to replace the thermostat in the engine. If it is stuck open, the car will over-cool when driving.

[game over]

the thermostat is new. the previous has the same symptoms

[gadget73]

Do you have a temperature gauge in the car? What does it read? Is the coolant level low? Air in the system might cause this problem. Is it an automatic climate control car? Sometimes when the sensors fail, it can cause no/poor heat. Automatic climate control says so on the control unit, and it has temperature numbers on the scale. Non-automatic simply says "cool" and "warm".