Had to bypass the heater on my 89 300e for a week due to a leaking matrix, ran fine with no difference in operating temp. It was a very involved job to change it though

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87 w124 zender 3.6 - 3.0 kompressor in progress!
96 w124 e300 diesel - slowly being modded
98 w208 230 kompressor - m103 testbed SOLD.
96 s124 om606 superturbo diesel 508bhp