My blower just shuts off completely and then it starts slowly and then again shuts off. This keeps on happening continously.The problem is every time it shuts off, the recirc button also goes off and I have to press the recirc button every time as I can feel the hot outside air blowing on my face.This happens mostly when the car is parked in the sun and during the hot afternoons.It takes a real long time to cool. Most of the time during the evenings it cools perfectly well and there is no intermitent cutoff of the blower.The temperatures here in Dubai now are quite hot around 42C and they will be going upto 47- 48C in the next two months(July to August). Will someone please tell me what do I need to check or replace.
This problem started after I had the evaporator replaced.

One more concern of mine is that I feel my car is running a bit hot.
What should the normal temperature be if the outside temp is around 42C
with high humidity and A/c running.
I am also confused regarding the temp indicator. I used to believe that the horizontal hash indicates 100C, but my mechanic tells me it is 90C. I get worried when it goes above that mark.
Will someone please educate me on this.

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300CE 1989 Euro Model.
ML350 2011.

anybody please

__________________
300CE 1989 Euro Model.
ML350 2011.

You need to start by connecting manifold gauges and checking the refrigerant charge. 100C engine coolant temp won't hurt anything as long as the system is full of coolant.

Good luck,

The intermittant blower operation may be a loose connection made worse by temperature change. Perhaps a plug was not connected properly when the evap was repalced? Have cheack your fuses. These things can creat an intermintant high resistance connection because of the design of the fuse. Remove the compressor fuse and inspect it. Oxides somtimes build up on the ends. The first sign of this kind of trouble is a very hot fuse.

Had a problem yesterday on the drive to Houston where the A/C suddenly started blowing hot. Finally cooled down but the center vents weren't putting out air. (I'd also had some other weird things going on with it the last few weeks.) Under dash pods had recently been replaced. Last night we swapped the CCU and problem still existed. Luckily my son saw where the cannon plug to the A/C amp above the glove box had become disconnected. Plugged it back in and A/C now working like a champ.

So, your problem could be something as simple as what we ran across. I suppose the A/C amp might also be bad. However, I'm not technically sharp enough to diagnose.

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000

Thank you all.

I will check refrigerant charge and post it here.
I also would like to check the compressor fuse. Could you please tell me where it is located exactly. Is it in the Fuse box.
the loose connection referred to by lenny, is this connection at the blower.

I believe the problem has something to do with the heat.
Only when the car is sitting under the sun for some time the problem shows.
It does not appear when I start from the garage in the morning.

__________________
300CE 1989 Euro Model.
ML350 2011.