I doesnt get enough heat in my 560 sec.... the engine heat is ok but if its cold outside (and thats ofen here in sweden) and i drive about 100km/h it doesnt blow warm... if i drive slow its warm and nice in the car but not when i drive faster... It isnt the monovalve problem ... it doesnt blow icecold just not warm enough...

any ideas.... thanks...

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-88 560SEC
-77 280SE
-71 Mercury Cougar Convertible
-84 GMC Pickup