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+--- Thread: ma heater aint so hot while on the highway :( (/showthread.php?tid=3089)
ma heater aint so hot while on the highway :( - randomdude - 11-05-2011
any idea what this is? cruisin the strip downtown it works great, more than great actually. But runin at highway speeds it makes virtually NO heat. 1981 300DT.
Ideas? TIA!
RE: ma heater aint so hot while on the highway :( - willbhere4u - 11-05-2011
rebuild mono valve that was the problem in my dads car
RE: ma heater aint so hot while on the highway :( - sassparilla_kid - 11-06-2011
Does the engine temp stay fairly constant?
RE: ma heater aint so hot while on the highway :( - serverman777 - 11-11-2011
Im having this issue too. Its getting cold outside. I need to fix this. Rebuilding mono valve work?
RE: ma heater aint so hot while on the highway :( - willbhere4u - 11-11-2011
It did on my dads car he got the rebuild kit off eBay for like $40 It's the heater valve on the firewall behind the intake manifold by the battery
This will only fix the heat if you engine is running at the correct temperature!
If you engine is running cold check your thermostat first
RE: ma heater aint so hot while on the highway :( - serverman777 - 11-11-2011
Well its running at 100C most of the time. I know its a little hot, but I really don't care that much in the winter.
Ok found the "how to" for my car "w126" http://mbz.org/articles/hvac/plumbing/monovalve/
Im to cheap to spent 40 bucks. Im just going to pull it off my parts car. Hope they are the same (parts car is a 500 SEL, and the car that Im having the issue with is a 300 SD)
RE: ma heater aint so hot while on the highway :( - willbhere4u - 11-11-2011
It's worth a try I would think it would be the same on all US model w126s
RE: ma heater aint so hot while on the highway :( - serverman777 - 11-11-2011
Well lets just hope so, fingers crossed!
RE: ma heater aint so hot while on the highway :( - serverman777 - 11-11-2011
[img]
![[Image: NfS1H.jpg]](http://i.imgur.com/NfS1H.jpg)
[/img]Looks like there was a rip in mine. Changed it out just fine Thanks for the help!
RE: ma heater aint so hot while on the highway :( - randomdude - 12-31-2011
hey guys! havnt had the 'net 4 quite a while but thanks 4 the replys!
RE: ma heater aint so hot while on the highway :( - zacharias - 01-03-2012
(11-11-2011, 11:23 AM)serverman777 Well lets just hope so, fingers crossed!
Indeed. A word of warning: the genuine Bosch rebuild kits are apparently out of stock in some areas.
There is another brand (sorry I forgot the initials, something like ATP) available but be warned some people are saying the insert only lasts a few months.
I found this out after I did mine with the other brand, about a month ago, of course
