Air always hot - 87 240DL

I have a problem with the climate control in my 87 240DL. No matter what
the temperature is outside, the air blowing is always hot. If I have it at
full speed, it seems a bit cooler, but I believe that is because it's moving
faster. Does anyone know of what might be causing the temp to be so high?
Anything easy to fix this?

Thanks,
Jason Williard

 

If its anything like whats in a 740, then it's very dependant on a good
vacuum source. Is there a separate electric vacuum pump somewhere? If that's
not running the system sticks on hot, and (on a 740) you can't alter what
vent the air comes out of.
Another thing to check is the condition of the switch gear on/in the centre
console, it's not unknown for it to overheat, and cause bad connections,
which can stop the pump working or cause the system to not be able to detect
the cabin temp properly.

TTFN, Ken

 

No, on a 240 the heater valve is cable actuated. The heater valve often
leaks internally, or the cable could be out of adjustment. The valve is
located just to the right of the gas pedal, behind the plastic panel.
Make sure that it is closing properly, and if not adjust the cable so it
does, and if it is, replace is.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

Oops! Sorry I was in 740 mode again! Your right, the heater valve has a
capillary tube to maintain the set temperature, so your also right about
about the cable. However if the OP's cable is adjusted correctly, I would
suggest changing the valve, as it's internal rubber seal has probably
perished, apologies for any confusion.

Ken

Oops! Sorry I was in 740 mode again! Your right, the heater valve has a
capillary tube to maintain the set temperature, so your also right about
about the cable. However if the OP's cable is adjusted correctly, I would
suggest changing the valve, as it's internal rubber seal has probably
perished, apologies for any confusion.

Ken